Wednesday, November 17, 2010

Re-Cap of Physics III



Hey everyone,

First, I should let you guys know that I've tried calling the center at 601 Walnut Street to investigate supplies, and I don't think there really is a working number -- the one online just keeps ringing without anyone answering.  Suffice it to say, most test centers use the same type of scratch paper (either computer paper or "blue books") and ear protection (both earplugs and headphones).  I'm not sure about the mouse (wheel or not); hopefully it will not impact your test-taking strategy too much!

A few words about the homework for our upcoming session (General Chemistry III) next time: 
  • General Chemistry Review Notes Chapters 10-11 (Acids & Bases, Redox Reactions and Electrochemistry)
    • We will be discussing titrations in quite a bit of depth so don’t worry if you find the Review Notes don’t give it enough attention.  As a heads-up, the lesson book page devoted to titrations might not have enough for you to write down everything, so bring a couple post-its or an extra sheet of paper.
    • In the redox chapter a lot of attention is given to balancing redox reactions, but we will not review how to balance these reactions in class because the MCAT rarely tests this concept.  For now, just keep in mind all that happens is we have to balance charge as well as mass.

Helpful Hints from Physics III:
  • Now that you’ve taken one full length CBT practice test, it’s time to begin building additional practice tests into your study schedule.  Kaplan offers a total of 19 full lengths – only five of them are formally scheduled in the course (and required for HSG eligibility).  Our strong recommendation is that between now and Test Day you take all eight of the AAMC Practice Tests which are available through your kaptest.com syllabus (My ToolBox tab).  Unlike Kaplan Full-Lengths 1-5, you can take the AAMC Practice Tests and Kaplan Full-Lengths 6-11 as many times as you like and you can suspend the test if you need to and resume it at a later time.
  • Remember that the buoyant force exerted against an object placed in a fluid is simply equal to the weight (F = mg = r­­fluidVsubmergedg) of the fluid displaced by the volume of the object submerged.  Be careful of subscripts!
  • An object whose specific gravity is equal to 1.0 will be fully submerged but will not sink when placed in water.
  • While ray diagrams are helpful for us to determine what type of image we’ll see (real/inverted), resist using them on Test Day.  Stick to the mathematical side and sign conventions to determine your images.  For practice on just “seeing” what’s going on, check out this applet:
  • Remember light!  IR and UV are two types of light just outside the visible spectrum and they help us remember that inverted = real and upright = virtual.

Finally, let’s discuss the review assignment for Physics III as it appears in your syllabus:
  • Light & Geometrical Optics Test 1
  • Atomic & Nuclear Structure Test 1
  • Fluids & Solids Test 1
    • Each one of the topical tests is tough, but they’re good learning opportunities.  The first passage from the Fluids & Solids Test 1 lightly applies fluid dynamics to the circulatory system (the AAMC has gone here before), and the first passage of the Light & Geometric Optics Test talks about nearsightedness and farsightedness (another concept the AAMC has tested before). 

  • Physical Science Section Tests
    • The online syllabus has recommended that you complete the first few PS section tests; however, it is probably in your best interest to wait on these because we have not even covered General Chemistry III yet.  Moreover, wait until you finish your review of the LB and topical tests before attacking the section tests.  For those who are ready to tackle these PS section tests now, a word of caution:  these tend to run on the more difficult side.  
That’s all!  See you at General Chemistry III.
Alexander S. Macnow
Master Teacher - MCAT/DAT/OAT/PCAT
Philadelphia and University City Kaplan Centers
Kaplan Test Prep & Admissions
(215)546-3317 (o)
(215)243-1711 (o)
(610)291-4587 (c)
Alex.Macnow@Kaplan.com

Sunday, November 14, 2010

Re-Cap of MSCT II

Hey everyone!

My apologies for getting this email out late -- it's been a long weekend!

If you did not complete Full-Length #1, do it by our next class!  If you start falling behind now, you will find it very difficult to catch up in the remaining time!

Now that I've inundated you with exclamation points, I wanted to further explain the two questions we discussed on Thursday (page 343):

For question 2 ("With which of the following statements would the author of the passage most likely agree?"), we were debating two answers:  (C) "Incidents was most popular among women readers when it was published"; and (D) "Novels can provide valuable insights into the history and politics of an era".  To discount (C), the best sentence we get is "But perhaps the most important reason they insisted Incidents was a novel was an inability to accept that the women depicted in the book ... could write a work so rooted in the melodramatic literary tradition popular among female readers and authors of the time."  This sentence tells us only that this literary tradition was popular among women; it does NOT tell us that Incidents, specifically, was most popular with women.  It is not out of the question, given the gravity and importance the author ascribes to the book, to imagine that Incidents was also very popular among men despite the fact that this literary tradition was usually female-heavy.  Answer choice (D) is supported in the first paragraph.  As the author writes:  "Originally published in 1861, Incidents ... was long regarded as a powerful argument for the abolition of slavery in the United States."  The phrase "long regarded" makes it fair to say that even when Incidents was believed to be a novel, it still had this significance to Americans (note that Yellin's research was in the 1980s, and while it may be a judgment call to say that "long regarded" has to account for at least some time before the 1980s, I think that's a pretty safe assumptino here).  Thus, answer choice (D) is verified.  Even when it was a novel, the author still believes that Incidents gives us a good window into the history and politics of the abolitionist cause.

For question 3 ("Each of the following is used by Yellin to support the idea that Harriet Jacobs wrote Incident in the Life of a Slave Girl EXCEPT:"), we were between (C) "Discussions of sexuality were deemed inappropriate for a woman in 1861"; and (B) "Lydia Maria Child was listed on the title page as its editor".  Let's start with (B).  Where is this fact given to us?  In paragraph 2 - "The title page provided no name other than that of its editor, Lydia Maria Child, a noted abolitionist and novelist, whose previous novels had included plotlines and themes similar to those in Incidents, fueling speculation that she was the author."  What is the role of this sentence?  To tell us one of the reasons 19th century readers believed Incidents was a novel.  Indeed, that's the purpose of this whole paragraph.  Yellin at no point uses this as evidence for why Harriet Jacobs is the author; in fact, Yellin doesn't use this information as support for herself at all.  The closest she gets is in paragraph 4, as it points out:  "... Yellin ... decided to re-examine the claims of [Incident's] authenticity made by the narrator and Lydia Maria Child. ... Yellin went one step farther, meticulously documenting the existence of people and events in the book.  Studying the paper of Lydia Maria Child and others in her circle, Yellin found among them Jacobs' letters and other documents that led to general recognition of Jacobs as the writer."  Carefully interpret this paragraph.  Yellin may have used the fact that Child was on the title page as a reason to check out the papers and ultimately discover Jacobs, but she never uses the fact that Child was on the title page to support her argument that Jacobs herself must be the author.  So where is the answer choice (C) discussed?  In paragraph 5:  "And the author's anonymitiy was explained in large part by the fact that the book discussed the unique and difficult situation faced by slave women:  the sexual predations of male slave owners and their powerlessness to exert on their own behalf society's standards of chaste womanhood.  Such matters would be deemed inappropriate for a woman to discuss publicly in 1861, but Jacobs saw the necessity of reaching out to her female readership in this manner."  Let's interpret:  "... the author's anonymity was explained" by Yellin.  The real clincher of this sentence is that opening phrase.  It is what allows us to understand that Yellin was using this fact to support her central argument -- that Jacobs was the author.  Understandably, our reaction to Yellin could be "Sure, that explains why she's anonymous, but why does it have to be Jacobs?"  But that doesn't really affect the answer to the question.  The question is merely asking what evidence Yellin provided, whether or not is "good" evidence.  Based on that opening line, these sentences are part of Yellin's explanation and evidence.  The anonymity (and explanation thereof) are part of that argument, and therefore (C) cannot be our answer to the question.  Remember -- think like the MCAT.  They want you to focus on structure and how arguments are made.  If a fact is in paragraph 2 ("why people thought Incidents was a novel"), it isn't part of Yellin's evidence.  If it's in paragraph 5 ("Yellin's evidence"), it sure is!

Let’s start by discussing our upcoming session, Physics III.  Your required homework is:
  • Physics Review Notes Chapters 5, 10-12 (Fluids & Solids, Light & Optics, Atomic Phenomena, Nuclear Phenomena)
  • OWQ: Atomic & Nuclear Phenomena Workshop
    • The Lesson Book does not devote a lot of class time to Atomic & Nuclear Phenomena, so if you’re pressed for time prioritize completing the chapters associated with Fluids & Solids and Light & Optics over the other two.  Mercifully, Unit III is lighter than Unit II but the topics tend to be heavily tested.

A lot of times, people start feeling a little discouraged after MSCT II because they often see score decreases on their first full-length and are worried that the class is starting to get into the last unit.  Thus, I have a bunch of good tips below to hopefully help motivate you and keep you focused on Kaplan’s methods and the MCAT!

1.  Approach the test with a sense of adventure, not a sense of dread.

2.  Knowing when to give up is a strategy, not a failure.  It’s better to take a good guess than to spend lots of time on one question which you might get wrong anyway. There's another question to come, and another chance to gain points.

3.  Stay flexible. Your prediction doesn't fit any answer? Can’t even make a prediction? Hang loose and let the question and answers help you.

4.  Utilize the shrug factor.  What’s that?  It's when you shrug your shoulders and say, “whatever.”  You'll just do the best you can.  Experience shows that students who use the shrug factor often do quite well on a passage; much better than they expected.  It’s a much better approach than getting all stressed out and nervous.  The brain doesn't work well under those conditions.

Tips Especially for Verbal
1.  It’s all about the author. Let me repeat that: it's all about the author.  Most MCAT passages are author-driven so most questions are about the author. Find the author's voice, even if it's neutral. It pays off in points. Have you ever counted how many questions in a passage revolve around the author? Try it - you'll see that most do.

2.  The bottom line for getting the right answer on the MCAT verbal section is (a) find the author's voice (you knew that) and (b) stay in scope. If you just do those two things, you've got pretty much everything you need for correct answers.

3.  The harder the passage, the less you want to struggle. What happens when you're stuck in quicksand and you struggle? You sink deeper.  Same thing with a killer passage. The more you try to understand it, the deeper you're going to sink into the quicksand. Here's where the shrug factor comes into play.

4.  When you don't understand a paragraph, map anything. Grab a word or two which seem to be unique to the paragraph, and leave it at that. You don't need to understand it if there's no question on it, and if there is, you'll know where to go back in the passage. You still don't need to understand the full, philosophical meaning of the paragraph. You just need to answer a specific question, and that's a whole lot easier.

5.  Think like the testmaker. Did you encounter an odd word, a difficult phrase, a strange turn of ideas? Wonder why they're there? So does the testmaker, and he's likely to ask you about them. Be alert to how the MCAT is designed and you'll know what's important. Most important, of course, is the author's voice. You can bet on several questions about that.

6.  Have no doubt that a detailed passage, usually in science, will have several detail questions. Try adding a few details to your paragraph map to make it easier to find them when you need to do research, especially with scattered detail questions.

7.  There are lots of deduction questions on the verbal section of MCAT, and most of those are inference questions. An inference is an implied conclusion, and the conclusion is the author's voice - you noted that in the "purpose." When you have an inference question, just look to the author's conclusion and choose the answer which says exactly the same thing, but in different words.

8.  Why does the author have inferences anyway? Why doesn't he just write everything he wants you to know? Because he thinks the inferences and assumptions are obvious. If you're told that Kaplan is the best place to prep for MCAT, then it's obvious that Kaplan provides MCAT prep. It's so obvious that it's not going to be stated, thus it's an inference. When doing inference questions, look for the obvious, and don't go out of scope. That's the testmaker's favorite wrong answer for inferences.

9.  When you're stuck between two choices, don't guess. The correct answer is reflected in the passage and the incorrect one isn't. Each and every time. Count on it. Look at each answer separately (don't compare them; there's no such thing as better and best, only right and wrong), then ask yourself: ok, where is this in the passage? If it isn't in the passage, it's wrong.

See you in Unit III!

Gen chem recap email


  1. (pg 4, email): -How is Grahm’s Law a rearrangement of Avg KE α Temp?
Consider that at the same temperature, two gases have the same KE.  That means KE1 = KE2, or m1(v1^2) =m2(v2^2).  We can rearrange that to m1/m2 = (v2^2)/(v1^2).  Taking the square root of both sides, we have sqrt(m1/m2)=(v2/v1).  "Rate" is another term for velocity, so we have Graham's Law.
-Why doesn’t mass affect average KE as well?
As mass increases, velocity decreases so that we have the same KE.

  1. [pg 4, email, van der Waals eqn of state(Real Gases)]: How are “real pressure lower than expected due to attractive forces”? Are these pressures referring to pressure exerted by gas?
Real pressure refers to the pressure exerted by the gas, yes.  When the gas particles are attracted to each other, they no longer occupy as large a volume (their attracton pulls them close to each other).  Thus, with reduced volume, they are no longer pushing as hard on the walls of the container.  They are exerting a smaller pressure.

  1. (pg 4, email vdW state of Real Gas): How are you discerning these trends of volume from the graph in the email? In class, I think the axes were flipped.
I did present it another way in class, but consider that pressure is the x axis here (and thus not really affecting our Y-axis), R and T are constants, and so the only variable we're really affecting in the y-axis is volume.  This shows us that predicted volume is below 1 and then above 1 (i.e., below predicted, and then above predicted) as we increase pressure to higher and higher levels.
                    
                  -What pressures are you modulating (the x-axis); is it the pressure of gas or of the container?
This is the pressure created by the container.

Friday, November 12, 2010

Capacitance

1. if K < 1 then does that mean the dielectric will decrease capacitance, or
does that mean it's just not a very good dielectric?
In theory, that would be true.  However, all dielectrics have a K>1 value, because all dielectrics are designed to increase capacitance.

2. the explanation for #9 in physical sciences on full-length 1 includes
this chunk: "the capacitor is in series with the transformer and therefore
charging" -- I guess I don't understand why that is, and what if it was in
parallel?
For a capacitor to charge, it must be connected to a voltage source.  Here, the transformer is serving that function.  Given the circuit setup, there's no way for the capacitor to be in parallel with the voltage source, since that's the only thing it's hooked up to.  Either way, a capacitor will always be in series with the voltage source, since that's where it draws its energy from.

3. I also just didn't understand the explanation for 18 in physical sciences
on full length 1.
Writing out the explanation for this question is very complicated; I'd encourage you to watch the Explanation-on-Demand in the test, since it gives a very good explanation of all the math here.  In general, I think Explanations-on-Demand do a great job explaining the science questions (plus, you get to hear my lovely voice some more!)

Gen chem questions

 What properties would a different mass number (A) affect?
A different mass number will affect the mass of that particular atom, and the number of neutrons in that atom.  Different mass numbers correspond to different isotopes -- for example, Carbon-12, 13, and 14 have different mass numbers, but they all have 6 protons and 6 electrons.  They have 6, 7, and 8 neutrons, respectively.


 Where did angular momentum equation (both of them) come from?
  1. L=mvR , Avg momentum of electron = nh / 2Π
The first one comes from physics (rotational motion).  This is NOT something you are required to know for the MCAT.  It says that the angular momentum is equal to the mass of the object, m, times its velocity, v, times the radius of the orbit, R.  The second one is a quantum-mechanical devised formula.  I'm not sure of its derivation, but it's a definition from the quantum model.

    1. Also, where did quantized energy of electron come from? E = -Rn­­­­  / n­­­2  This comes originally from Bohr's model of the atom (remember passage one from Gen Chem I lesson), and corresponds to the energy for a given principal number.

  1.  Negative sign of energy equation, E = -Rn­­­­  / n­­­2    What is equation showing? (Is it PE?)
This is indeed potential energy.  It's negative because the force this energy comes from is an attractive force.  In general, this means that increasing principal quantum number means higher (less negative) energy.

  1.  Why isn’t equation 8 the normal equation of final – initial for E =hc/  = -Rn [1/ni- 1/nf2] ?
It still is.  They've factored out the Rydberg constant in the equation.

  1.  Explain Atomic emission spectra versus absorption spectra.  What is exactly happening and what does spectra look like?
When electrons jump up in energy (to a higher n value), they need to absorb energy to do so.  That's the absorption spectra.  When they drop in energy, they give off this energy -- that's the emission spectra.  Conveniently, this often corresponds to light energy in the visible spectrum, which means that we can see what wavelengths of light are absorbed or emitted if we pass all wavelengths of light through a sample of that atom.  It can be used as like a "fingerprinting" for an element -- every element has a different absorption and emission spectra.  A good visual is provided here:  http://www.cartage.org.lb/en/themes/Sciences/Astronomy/Modenastronomy/Interactionoflight/AtomicAbsorption/spectra.gif

  1. What is the difference between shell, subshell, orbital? Could you provide a visual?
Think of this like the assigned seating analogy.  A different shell is like a different section in a stadium, a different subshell is a different row, a different orbital is a different seat.  Within a shell, there may be many subshells; within a subshell, there may be many orbitals.

  1.  -do you need to memorize the formulas for the quantum numbers?
    1. -need to see visual for each?
Visual is provided in question 6 - assigned seating.  And yes, you do want to know the various quantum numbers available, given a specific principle quantum number.
  1. -Is Table 1.2, ml row incorrect with two zeros? What’s the order?
There are two available spins (+/- 1/2), so there are two different electrons that can be in the same ml = 0 orbital.

  1.  Would violating any of the other rules, such as Hund’s Rules also violate the Pauli Exclusion principle? I originally thought the violation would be Hund’s Rule? (But such answer choice is not available)?
Depending on the circumstance, you could violate more than one rule if you're doing something that's not scientifically possible.  Do know, however, that the Pauli exclusion principle is not violatable in the natural world.

  1. What is considered “inner transition” vs. the “transition elements” and could you explain the rationale behind the different rules for counting valence electrons?
"Inner transition" are the lanthanide and actinide series (f block).  "Transition" are the d block (Sc-Zn and the elemens below them).  Valence electrons work as follows:
s block:  1 or 2, depending on which group
p block:  2+how far over in the p block (i.e., O = 2+4 = 6)
d block:  2+how far over in the d block (i.e., V = 2+3 = 5)
f block:  2 +how far over in the f block (similar to above).


    1. Doesn’t the number of valence electrons for sulfur depend on the resonance structure chosen for sulfate?
    2. Different resonance structures mean different arrangements of electrons, and thus (possibly) different formal charges.  The valence electrons when an element is unbound is a constant (for sulfur, it's 6).  And while different resonance structures CAN mean different numbers of valence electrons in the BOUNDED state, all the resonance structures of sulfate have the same number of valence electrons around sulfur.

Days before MCAT

Hey Alex,

So I was going to email you this question but then I realized a few other people in the class also work and may have the same question.

I was wondering what you would recommend doing the days before the MCAT. I work and might be able to take a day or two off before the test. Is having time to relax before the exam a good idea or does it just leave more time for being nervous? Would you advise taking a few days off (if so, how many) or not? Or would you take time off not immediately before the test but a week before, to study more or something?

Thank you in advance.
-------------------------
We will actually talk specifically about what to do two months before your MCAT, a month before, the week of, etc. during MSCT III, but here's the general idea:


The day before the MCAT is YOUR day.  You do NOT study for the MCAT, you do not talk about the MCAT, you do not take practice tests.  With exception of gathering the test materials, you don't do anything MCAT-related.  However, you don't want to just veg around all day -- you'll start getting nervous, and that's no good.  The day before the MCAT, you want to plan something to do:  go out to lunch, accomplish errands and other "activities of daily living," hang out with friends -- whatever you want.


As for the day before that (2 days before your exam), that's up to you.  I usually tell people it's not a great day for a practice test, but it could be okay to study some of the last material you want to cram into your head.  Whether or not you take off work is entirely up to you, but make sure you have something planned again so you don't have the "I'm-sitting-around-but-getting-nothing-done" nerves.


For studying in general in those last couple weeks, your goal should be 1-2 practice tests per week, with interspersed study sessions of the material, topical tests, section tests, etc.  This ends up being about 20 to 25 hours per week; if you need to take off work a little to accomplish this, you may want to do just that.  Remember that your goal should be to study hard for the MCAT this time around, and not have to deal with it again!

Tuesday, November 9, 2010

Re-Cap of Biology II

Hey everyone,

First and foremost, if you have not yet done Full-Length #1, that is your official homework for MSCT II!  Do NOT forget to complete this test!  WHEN YOU TAKE FULL-LENGTH #1, DO SO IN INTERNET EXPLORER!  THERE HAVE OCCASIONALLY BEEN GLITCHES REPORTED WITH SAFARI AND FIREFOX.  When you take Full-Length #1, don’t forget to turn off spell-check, grammar-check, and auto correct if you plan to complete the writing samples.

In regards to the question I got earlier tonight about bicarbonate and glycolysis, I have two things to consider (I'm not sure if either truly answers the question that was asked, but I'll give it a try):
-When the body is hypoxic (low oxygen) and must go into anaerobic respiration, it starts producing lactic acid.  This lactic acid, being an acid, meets up with the bicarbonate in the blood and causes a "metabolic acidosis" - that is, because of metabolic disturbances, the body becomes more acidic.  In particular, this is often refered to as a "high anion gap" acidosis, mainly because there are a lot of anions in solution that shouldn't be there (drinking a lot of HCl would be an example of a "low anion gap" acidosis).  Basically, lactic acid will lower blood bicarbonate levels.
-I found a few studies that indicate that increased bicarbonate stimulates glycolysis (most of these were done in bacterial models, but I'm guessing it also applies for humans -- our glycolytic enzymes are similar although not identical).  In particular, it seemed to activate one of the enzymes (glyceraldehye-3-phosphate dehydrogenase, or G3PDH), used right after glucose metabolites are split into two 3-carbon molecules.  I hope this helps!

This re-cap email is going to be a little different.  Since biology is, at its core, a visual science, I wanted to get a bunch of great online resources to you so you can see these processes occurring.  One of the most popular introductory biology textbooks, Life: The Science of Biology, has a companion website that has compiled an impressive array of animations that is available to the public (i.e. you don’t have to register with the website and/or provide proof of purchase to view the animations).  Given that we humans tend to learn better from visual stimuli, reviewing these animations may be a nice way to review the wealth of biology topics that might be tested on the MCAT.  Introductory biology courses cover a vast array of topics, far greater than what the MCAT covers, thus many of the animations on this website are not relevant to the biology you need to know for the MCAT.  Therefore, I have taken the time to specifically list the animations that are relevant to the MCAT below.  To help make your review more efficient, I’ve previewed each video and provided comments on the merits of each animation.  Enjoy!

List of animations from Life: The Science of Biology relevant to the MCAT
  • Chapter 6, Tutorial 6.2: Allosteric Regulation of Enzymes
    • Some of the questions on AAMC exams like to play mind games with your ability to understand the difference between allosteric activators and inhibitors.  This topic can be combined with molecular biology and genetics concepts so it is in your interest to have a strong foundation in this concept so you can answer tough critical thinking questions related to enzymes.
  • Chapter 7, Tutorial 7.1: Electron Transport and ATP Synthesis
    • Please note that you don’t need to know the names of the electron carriers… this animation is included in the list because while many students remember that oxygen is the final electron acceptor they tend to forget precisely how the generation of the proton gradient is the key player in actually leading to the synthesis of ATP.  This animation does a decent job of helping you visualize that process.
  • Chapter 8, Tutorial 8.2: Photophosphorylation
    • What, photosynthesis?  Really?  Yes, really.  It’s on the AAMC list of topics and they have tested it in the past.  What you need to know is that during there are two phases: the light-reactions and the carbon-assimilation reactions (aka the dark reactions, but since that name is misleading it is being phased out).  This animation covers the light reactions, which explains how plants use sunlight to synthesize ATP and NADPH.  These products are used in the carbon-assimilation reactions to synthesize sugars.  Thus, at the end of the day we get the famous net reaction: CO2 + H2O + sunlight à O2 + sugars.  As with ETC, you don’t need to know the details behind photophosphorylation…just the major concepts as I’ve discussed here.
  • Chapter 9, Tutorial 9.1 and 9.2: Mitosis & Meiosis
    • These animations review what occurs in each stage of mitosis and meiosis.  In both animations, the parent cell has two pairs of chromosomes.
  • Chapter 10, Tutorial 10.1 and 10.2: Independent Assortment of Alleles; Alleles that Do Not Assort Independently
    • The 9:3:3:1 phenotypic ratio that results from a dihybrid cross of two heterozygous parents is dependent upon this concept.  Most classical genetics questions presume that the alleles in question assort independently, but the AAMC has also tested your ability to answer questions about linked genes so make sure you’re up to speed on both scenarios.
  • Chapter 11, Tutorial 11.1 and 11.3: DNA Replication, Part 1 and Part 2: Replication of a Chromosome and DNA Polymerization; Coordination of Leading and Lagging Strand Synthesis
    • These two animations review DNA replication quite thoroughly.  As usual, don’t memorize details…just re-familiarize yourself with the concepts.
  • Chapter 12, Tutorial 12.1 and 12.3: Transcription and Translation
    • These animations cover the processes that lie at the heart of molecular biology.  It is in your interest to have a thorough understanding of these processes so that you can be prepared for some of the applications of these concepts to difficult passages and questions.
  • Chapter 13, Tutorial 13.1 and 13.3: The lac and trp operon
    • These simple animations succinctly review the difference between inducible systems (lac operon) and repressible systems (trp operon).   
  • Chapter 15, Tutorial 15.1: Signal Transduction
    • The content reviewed in this animation is NOT knowledge you need to know for Test Day, but it could be helpful for you to visualize how signal transduction cascade mechanisms proceed just in case you encounter a passage that discusses signal transduction.
  • Chapter 18, Tutorial 18.1: Cells of the Immune System
    • There is no animation here – merely a detailed chart on the various cells of the immune system.  Most of the information presented in this chart is beyond the scope of what you need to know for the test, so it is not advised to memorize the information presented here; nevertheless, reviewing this chart briefly may help your comprehension of the organization of the immune system and how the various players interact with each other.  The key players to focus on are B cells, T cells, neutrophils, and macrophages. 
  • Chapter 18, Tutorial 18.2: Pregnancy Test
    • This animation is way out of scope for the test.  It is suggested for review, because applications of immunology such as the one presented here is good fodder for an experimental style MCAT passage.  A well-organized animation like this one makes it easy to understand how the test works, but as you review this animation take note on how understanding this test may have been harder if it was presented to you on the MCAT in prose without any diagrams.
  • Chapter 18, Tutorial 18.3 and 18.4: The Humoral Response and the Cellular Immune Response
    • These animations review the immune system in a bit more depth than the Kaplan Immunology Workshops, but while some of the content presented here is out of scope these animations should help clarify normal immune system function.  The word “normal” was underlined in the previous sentence because having a firm grasp on understanding how the immune system normally functions will help prepare you for questions that test your ability to apply that knowledge to explain and predict what occurs when things go wrong (such as in AIDS).
  • Chapter 22, Tutorial 22.1: Natural Selection
    • There’s a few reasons I recommend this animation…one, it wouldn’t shock me if the MCAT asked you to be able to delineate the difference between directional, stabilizing or disruptive selection (in the context of a passage) and this animation does a really good job of explaining the difference.  Second, I find the bird throwing up after eating the unpalatable butterfly kind of cute. 
  • Chapter 40, Tutorial 40.1: The Hypothalamus: The Body’s Thermostat
    • This animation nicely sums up the thermoregulatory function of the hypothalamus plus at the end we learn that the hypothalamus itself functions as a temperature sensor.
  • Chapter 41, Tutorial 41.2: Hypothalamic-Pituitary-Endocrine Axis
    • A very nice review of the hypothalamus, and it even provides a nice chart summary of the major hormones and their functions.
  • Chapter 41, Tutorial 41.3: Hormonal Regulation of Calcium
    • A very nice review of all the players (bone, kidney, digestive tract) that affect blood calcium levels.  Notice that homeostasis is still maintained even if the thyroid is removed. 
  • Chapter 42, Tutorial 42.1: Fertilization
    • Almost all of this is out of scope, but it’s cool to see. 
  • Chapter 42, Tutorial 42.2: The Ovarian and Uterine Cycles
    • These animations are quite fantastic, and all of the content reviewed is material you need to know for Test Day. 
  • Chapter 43, Tutorial 43.1: Gastrulation
    • Embryology can be hard to understand without visual animations like this one…that said, embryology isn’t a high-yield topic so don’t get carried away with memorizing all of the content presented in this animation. 
  • Chapter 44, Tutorial 44.1: The Resting Membrane Potential
    • This animation does a nice job of showing how the electrical and chemical gradients balance each other to create the negative resting membrane potential.  This topic seems innocent, but tough questions
  • Chapter 44, Tutorial 44.2: The Action Potential
    • This animation teaches the action potential the exact same way the Kaplan MCAT Lesson Book does, so this animation is a nice review of material you have already covered in the classroom. 
  • Chapter 44, Tutorial 44.3: Synaptic Transmission
    • A brief visual on what goes on at the pre-synaptic and post-synaptic membranes.
  • Chapter 47, Tutorial 47.1: Molecular Mechanism of Muscle Contraction
    • A well-organized and thorough review of the entire mechanism of muscle contraction.  It has everything you need to know for Test Day.
  • Chapter 48, Tutorial 48.2: Human Respiratory System
    • There’s nothing special here, as the Kaplan online workshop on the Respiratory System covers all the content in this animation.
  • Chapter 49, Tutorial 49.1: The Cardiac Cycle
    • This animation is broken up into four “options”: the second and third options review material that is out-of-scope to the MCAT (still, it’s not hard to follow), but the first and fourth options are in-play.
  • Chapter 50, Tutorial 50.1: The Digestion and Absorption of Fats
    • This animation nicely illustrates how bile emulsifies fats, and how that action facilitates their digestion.
  • Chapter 50, Tutorial 50.2: Insulin and Glucagon Regulation
    • These animations review the effects of insulin and glucagon on the liver and blood glucose levels.
  • Chapter 51, Tutorial 51.1: The Kidney
    • A concise and thorough review of almost everything you need to know about the kidney.  One major fault is that the animation fails to discuss the roles of ADH and aldosterone.

  • Molecular Cell Biology Textbook, Chapter 3: SDS Gel Electrophoresis and Immunoblotting
    • These two animations hail from the same publishing company, but on a different website because they relate to their Molecular Cell Bio textbook.  These two animations provide an overview on how proteins are commonly studied in molecular biology labs.  Although some of the content and procedures discussed here are out of scope for the exam, the AAMC’s recent emphasis on molecular biology probably makes it worth your time to view these animations.  In fact, we recently received a report that one of the recent MCATs featured a challenging experimental passage about immunoblotting.

Reviewing all of these animations is a great way to get an overview of a large percentage of the biology you need to know for Test Day, but don’t get seduced into thinking that reviewing these animations will suffice.  Use the animations as one tool to help you prep for the MCAT.