MCAT Materials Change Log MCAT Materials Change Log

Fields marked with an * are required

Get a Free MCAT Consultation

A Next Step Academic Manager will contact you within 1 business day or call us now at 888-530-6398.

Contact us

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

MCAT Materials Change Log

Thank you for purchasing Next Step MCAT prep materials. As a part of our effort to provide the absolute best materials in the industry, we make frequent revisions in response to student and tutor feedback. Below you will find a log of all the updates made to Next Step’s materials. To use this page, simply look at the first page of your book on the About The Authors page. Under the description of the authors you will find a very small notation with a date in it. That date is the book’s version number. Find that date below and read the updates made from that date up to the present version. Students looking for a summary of the overall amount of content included in our books can see that summary here: Next Step MCAT Book Stats

 

STRATEGY AND PRACTICE SERIES

 

Critical Analysis and Reasoning Skills Strategy and Practice

2014-11-17: Removed extra question #6 on page 51, renumbered question #7 to #6.

2014-12-02: Made several changes:

• Typo clean-up throughout

• Added link to this update page to the About the Authors page

• Page 34 passage (and associated questions and explanations): changed “Chinese” to “Australians”

• Page 39, 40: fixed printing error with several paragraphs printing in lighter text

• Page 127, Question 13, Choice B: changed the word “nurses” to the word “pollution” to align with the explanation

• Page 136: Ankara is the capital of Turkey!

2015-05-01: Typo clean-up

2016-03-01: Current version

• Many small tweaks made throughout the book for the update to the 2016 edition

 

Psychology and Sociology Strategy and Practice

No date listedFirst version. The original version of the book only had 9 passages in each section, as we’d published the book before the AAMC had released final details on the number of passages in each section. For those who purchased the old version of the book, here is a free PDF copy of the new passages and discrete questions we added to the book: Psych S&P Update 2015-01-05

2015-01-10: Updated, including:

• Page 211: Question 41 was a repeat of question 38, and question 42 was a repeat of question 39. The explanations, however, did not have this issue. The questions as written in the explanations have been moved into the timed section as well.

2015-05-01: Typo clean-up throughout

2016-03-01: Current version

• Many small tweaks made throughout the book for the update to the 2016 edition

 

Chemistry and Physics Strategy and Practice

No date listedFirst version

2015-01-17: Several printing errors from Amazon’s in-house printing service. Made alterations (and yelled at Amazon) to fix the printing errors.

2015-05-01: Typo clean-up throughout

2016-03-01: Current version

• Many small tweaks made throughout the book for the update to the 2016 edition

 

Biology and Biochemistry Strategy and Practice

2015-01-14First version

2015-01-17: Several printing errors from Amazon’s in-house printing service. Made alterations (and yelled at Amazon) to fix the printing errors.

2015-05-01: Typo clean-up

2016-03-01: Current version

• Many small tweaks made throughout the book for the update to the 2016 edition

 

CONTENT REVIEW SERIES

 

Physics and Math

No date listed: First version. Several printing errors from Amazon’s in-house printing service. Made alterations (and yelled at Amazon) to fix the printing errors. If you ended up with a used copy of the book, here is a free PDF copy of the solutions with the correct equations: Physics and Math Content Review Solutions

2015-02-01: Typo clean-up

2015-05-01: • Page 70, Question 5 in Passage 1: The answer choices should be listed as 0.0, 0.1, 0.15, and 0.3. They were all listed as ten times too big.

• Page 94, near the very bottom of the page: The calculation right at the bottom of the page shows 1.7 x 3 and gives the answer as 4.1 when it should obviously say 5.1 m/s.

• Page 517, Question 5 Explanation: The explanation incorrectly lists the time as 0.06s when it should be 0.6s and the answer should be C: 0.15 m/s.

• Page 137, Question 15: To be technically correct (the best kind of correct!) the question should read: “To get the washer moving, the man would have to push just harder than:”

2016-03-01: Current version

• Many small tweaks made throughout the book for the update to the 2016 edition

• Explanations added to the Final Exam and Section Content Review Tests

• Momentum chapter eliminated

• Thermodynamics chapter added

• Expansions to chapters on sound, light, waves

 

Psychology and Sociology

No date listed: First version

2015-01-05: Swapped out some images that weren’t printing clearly

2015-02-01: Typo clean-up

• Page 95, Section 2: Content Review Problems: Question 22 re-worded for clarity.

• Page 310, Section 1 Content Review Problems, Question 10: The answer should be B. It’s an EXCEPT question! The answer key apparently got confused and picked a choice that was true. Choice B is the right answer and is false: there are, in fact, NO rods in the fovea in the middle of the macula. The fovea only has cones, which is why foveal vision is so sharp and so dependent on good light sources.

• Page 310, Section 1 Content Review Problems, Question 34: The answer should be C. Melatonin is produced by the pineal gland. Perhaps question 34 had a little too much melatonin in its system and it was sleepy which is why it had this typo.

• Page 311, Section 2 Content Review Problems, Question 24: The answer should be B.

• Page 311, Section 2 Content Review Problems, Question 85: The answer should be A. 2015-05-01: Typo clean-up throughout

2015-08-01: • Page 262, Question 61: Answer choice C should read “. . . will always result in . . .” and choice D should read, “. . . nation’s population, assuming no net immigration nor emigration.”

2016-03-01: Current version

• Many small tweaks made throughout the book for the update to the 2016 edition

• Explanations added to the Final Exam and Section Content Review Tests

 

Chemistry and Organic Chemistry

No date listed: First edition

2015-02-01: Typo clean-up

• Page 558: The answer to question #98 is listed as A. It should be B: (2 g H / 18 g water) x 100 g = 11% H by mass

• Page 559: The answer to question #65 is listed as C. It should be D: The problem involves CH4 as the limiting reagent from the previous question. Under those conditions, the 3 moles of CH4 will produce 3 moles of CO2: [3 mol CO2] x [44 g / mol] = 132 g CO2. Looks like the answer key forgot to carry the 1 when it was doing the multiplication.

2015-05-01:  • Page 83: There should be a lone pair of electrons on the sulfur in choice A of question #1.

• Page 180: Above question #8, there should be a line that says, “Note: for questions #8 – #10, assume the acids fully deprotonate.”

• Page 558: Section 1 Content Review, Question 44. The correct answer is D.

• Page 282: The chart comparing SN1 and SN2 has a typo – the rightmost column should be headed “SN2”

• Page 561: Section 4 answer key, choice 50 should say “C”. The question asks about a mixture of two bases (NaF, the conjugate base of hydrofluoric acid, and sodium acetate, the conjugate base of acetic acid) which would have a pH above 7.

2016-03-01Current version

• Many small tweaks made throughout the book for the update to the 2016 edition

• Explanations added to the Final Exam and Section Content Review Tests

 

Biology and Biochemistry

No date listed: First version

• Swapped out some images that weren’t printing clearly

• The answer key to questions 83-89 for the Section 1 Content Review test were all shifted down by one (a frameshift mutation!). The answer key has been fixed.

2015-02-01: • Page 327: The second ¶ of the passage makes reference to “protein fragments and DNA probe”. It should just say “the fragments and DNA probe”. We’re running a DNA agarose gel here, so there’s no protein fragments to be found anywhere. In addition, the pedigree image got all confused with how X-linked inheritance works. Clearly Figure 1 needs to study more! Here’s an updated image:

Bio CR Page 327 Pedigree

• Page 328: Question 10 should say “highest Tm?” The explanation explains as if it were asking about highest Tm, which it should.

• Page 339: The caption for figure 28.3 should say “adenosine diphosphate”. Since, you know, there are two phosphates in the picture.

• Page 486: Explanation to #6 lists B as the right answer. The correct answer is A. The rest of explanation explains why A is correct.

• Page 490: Question number 1 should have the right answer as D. DNA is negatively charged, meaning it’s an anion. Anions migrate to the anode (by definition!). The rest of the explanation is correct, it just got the anode/cathode thing backwards. Question number 2 refers to Individual #3 as an affected male. This is incorrect as the son gets a good copy of the X chromosome from his mother. Question number 3 has a typo at the very end – the final parenthesis should read (choice D) since they’re talking about choice D there.

• Page 491: Question number 5 – the very last two lines of the explanation are confusing. The end of that explanation should just stop after the word “increase.” Ignore everything after the dash. For question number 7 it correctly explains how choice C is the right answer, but the bold letter at the top says A. It should say C. Similarly, for question number 10 the bold letter at the top should say A. The rest of the explanation correctly explains why choice A would have the highest Tm.

2015-05-01: • Page 74: Question 6, Choice A: Should say “faster”. The poly-A tail helps keep the mRNA around and gets shorter over time – once the poly-A tail is gone, the mRNA is degraded. So, as the question asks, if the mRNA transcript lacks the poly-A tail, it will be degraded faster.

• Page 298: Question 5, Choice D: The answer choice should say 5 mM, the approximate intersection of the (+) and (-) lines and the explanation on page 488 updated to match.

• Page 331: Question 23, Choice A: The answer choice should read, “reads the lagging strand in the 3′ to 5′ direction.”

• Page 492, Question 4 Explanation: The answer should be C. Oxidizing NADH generates +0.315V and reducing FADH2 generates -0.219V so the overall reaction is simply the net voltage, which is +0.096V.

2015-08-01: • Page 494, Chapter 30 Solutions: Question 2 should list B as the right answer (the explanation matches choice B) and question 3 should list D as the right answer (the explanation matches choice D).

2016-03-01: Current version

• Many small tweaks made throughout the book for the update to the 2016 edition

• Explanations added to the Final Exam and Section Content Review Tests

 

MORE FREE STUFF! In response to feedback from students and our tutors, we decided to create a free content supplement for those students wishing to dive in-depth in the molecular genetics that may show up on the new MCAT. Over 100 pages of free new content, including several new practice passages. You can download it here: Next Step Bio Supplement – Chapters 35-37

 

MCAT Verbal Practice: 108 CARS Passages

2015-05-01: updated about a dozen passages and streamlined the layout for the 2016 edition

2016-03-01: Current version

MCAT QBook: 2000 Science Discrete Questions

2016-03-01:

  • Made consistency changes, typo fixes throughout
  • Page 1, Question 1, RN III: added “typically” to clarify the fact that DNA diameter does vary
  • Page 2, Question 7: changed “Does this correlate…” to “Is this consistent with…”
  • Page 3, Question 12: removed “now” from question stem to avoid confusion, since the semiconservative nature of DNA replication is not a recent discovery
  • Page 4, Question 16: these are nitrogenous bases, not nucleotides!
  • Page 11, Question 66, choice D: added the fact that the side chain of proline is bound to its amino group, which is actually what confers rigidity
  • Page 14, Question 79: emphasized that this is the central dogma of molecular biology
  • Page 34, Question 209: changed “apparent contradiction” to “observation”
  • Page 58, Question 359, choice D: changed to “an excitatory potential…”
  • Page 72, Question 445: changed “would” to “does,” since the stomach does have a low pH
  • Page 73, Question 449: this question should ask about structure B, not structure C!
  • Page 86, Question 525: changed “forces” to “interactions”
  • Page 93, Question 564: replaced diagram, which was too small to be readable
  • Page 95, Question 575: changed Enzyme C to Enzyme X to avoid confusion
  • Page 107, Question 643: changed “a number of other molecules” to “other amino acids with dissimilar properties” for clarity
  • Page 117, Question 719: the proton gradient is formed by the ETC, not required to run it
  • Page 119, Question 732: changed A and B to be less extreme – downregulation does not mean the associated reaction will be prevented entirely
  • Page 120, Question 738, choice C: removed incorrect reference to “the gluconeogenesis cycle” and replaced with simply “gluconeogenesis”
  • Page 127, Question 782: removed erroneous symbol before ∆G°
  • Page 143, Questions 862-863: 3 dB changed to 130 dB throughout, since 3 dB is extremely quiet and unlikely to cause discomfort
  • Page 157, table: changed >1% and >0.1% to <1% and <0.1%
  • Page 160, Question 960: changed “activity” to “effects”
  • Page 164, Question 983, choice C: changed to not specifically reference the English language, but instead the language of the girl’s community
  • Page 164, Question 984: answer was potentially debatable, so modified the question stem to directly reference the language acquisition device (a major component of the nativist theory)
  • Page 165, Question 990: note that this question does not accurately reflect reality; cultures certainly can have languages that lack gender distinctions while still following strict gender roles. Question was rewritten to reflect this
  • Page 165, Question 992: Ekman’s universal emotions are emotions that are observed across cultures. Simply being associated with particular facial expressions does not necessarily classify an emotion as universal.
  • Page 178, Question 1060, choice C: changed to “A soldier with a criminal history engages in role-playing and acts aggressively towards his commanding officer.”
  • Page 184, Question 1092, choice D: changed end of this choice to say “either high or low self-esteem”
  • Page 190, Question 1125, choice B: changed “confirmation bias” to “belief perseverance,” and altered explanation to match. Belief perseverance is more relevant here, since it refers to the persistence of past beliefs even when presented with contradictory information.
  • Page 206, table for Questions 1216-1217: the left-hand column heading should say “Atom,” not “Molecule”
  • Page 207, table for Questions 1218-1219 and Question 1218: this table and question should refer to atoms, not molecules
  • Page 207, Question 1220: “unknown molecule” changed to “unknown substance”
  • Page 207, Question 1221: fixed to reflect the fact that the right answer should be I, II, and III!
  • Page 213, Question 1260: units should be mg/m3 for all answer choices
  • Page 213, Questions 1261-1262: removed the reference to bacteria, since gut bacteria produce methane, not consume it
  • Page 214, Question 1275: specified that complete deprotonation can be assumed and that we are looking for the normality of [H+] in particular
  • Page 217, Question 1290: reaction did not add up as written, so it was changed to 2 A → D. Choice B should include [A] in place of [B]. Explanation was also updated to reflect this.
  • Page 217, Questions 1297-1298: reaction was fixed, since it did not add up as written; questions were rewritten to reflect these changes
  • Page 227, Question 1361: specified that SDS is in the solid phase
  • Page 227, Question 1366: modified to ask about the molecule “as pictured” to avoid confusion about the role of aromaticity in this ring
  • Page 230, Question 1380, choice D: changed to “all of the above are true” to avoid confusion
  • Page 233, Question 1407: should say “a 90-Pa decrease in pressure”
  • Page 237, Question 1423: changed “gardener’s” to “guard’s”
  • Page 241, Question 1451: changed answers to 1/3 N, 1/4 N, 3 N (correct), and 4 N
  • Page 243, Question 1467: specified that the question is asking for the pilot’s apparent weight, not his weight
  • Page 254, Question 1539: the answer choices should be in scientific notation here. Choice A is 7 x 10-3 N/C, choice B is 7 x 10-6 N/C, and choice C is 4 x 10-6 N/C.
  • Page 257, Question 1553: the units of the answer choices should be Ω, not W!
  • Page 263, Question 1601: added units for focal length (specifically cm, but it can also be measured in m)
  • Page 265, Question 1615: fixed incorrect mention of λ decay (not a form of decay), replaced with γ (gamma) decay
  • Page 265, Question 1618, RN IV: fixed incorrect mention of λ decay (not a form of decay), replaced with γ (gamma) decay
  • Page 273, Question 1656, choice B: changed “for fear that it will eliminate oil jobs” to “for fear that it will change familiar rhythms of American culture” to better reflect culture lag
  • Page 277, Question 1685: changed “assigned a p-value” to “obtained a p-value,” since a p-value cannot simply be chosen by researchers
  • Page 282, Question 1711: for clarity, changed second sentence of question stem to “All of the following correctly match a type of socialization to its definition EXCEPT:”
  • Page 290, Question 1754: modified first sentence of question stem to avoid reference to Mr. Jones working his way upward
  • Page 304, Question 1822: changed 3-bromo-2-butanol (which is not the structure pictured) to 1-bromopropane
  • Page 305, Question 1824: fixed mistaken labeling of question as #824
  • Page 314, Question 1879, choice C: changed λ to γ
  • Page 325, Question 1951: note that the numbers in these choices are meant to be labels, not subscripts; changed this to avoid confusion
  • Page 337, Question 1996, choice A: changed to “Use a smaller p-value as a cut-off for statistical significance”
  • Page 344, Question 45 explanation: last wrong answer explanation should be marked D, not C
  • Page 347, Question 71 explanation: last wrong answer explanation should be marked D, not C
  • Page 350, Question 94 explanation: last wrong answer explanation should be marked D, not C
  • Page 350, Question 96 explanation: last wrong answer explanation should be marked D, not C
  • Page 352, Question 107 explanation: “B, C, D” changed to “A, C, D”
  • Page 406, Question 568 explanation: clarified that Km can be found by solving for the x-intercept and then negating the reciprocal of that value. Otherwise, this explanation is correct.
  • Page 406, Question 570 explanation: changed DG and DH to ∆G and ∆H
  • Page 418, Question 670 explanation: changed “correlates to” to “refers to”
  • Page 422, Question 708 explanation: for explanation of IV, changed “other reactions that can be oxidized” to “other oxidation reactions”
  • Page 458, Question 1002 explanation: removed out-of-place explanation that was erroneously inserted from general chemistry section
  • Page 474, Question 1113 explanation: reworded to make clear that the self-serving bias is the opposite of the fundamental attribution error in terms of what attributions we make, but that both are still occurring in this case – the FAE in the case of your cousin, and the self-serving bias in the case of yourself.
  • Page 489, Question 1220 explanation for choice B: alkali metals are elements, not molecules. “Molecule” at the end of this explanation was also changed to “atom.”
  • Page 504, Question 1332 explanation for choice A: should say HF, not HC2H3O2
  • Page 512, Question 1400 explanation: removed partial biology explanation starting with “C:”
  • Page 514, Question 1408 explanation: incorrectly contains question instead of explanation. Note that D is correct; fusion = melting.
  • Page 521, Question 1455 explanation: changed W = FDx to W = Fd
  • Page 540, Question 1603 explanation: correct answer is cited, but wrong numbers are included. do should be 30, and di ends up being equal to 60.
  • Page 549, Question 1677 explanation: the correct answer should be D, not A, since the correlation between number of families and probability of helping is an inverse one. As such, this explanation should also say “negatively correlated,” not “positively correlated.”
  • Page 553, Question 1700 explanation: fixed mistaken labeling as #1770
  • Page 562, Question 1760 explanation: removed sentence beginning with “His annual salary…,” as it was inaccurate
  • Page 573, Question 1834 explanation: changed “one hydrogen atom” to “one alkyl group”

2016-07-01: Current version

  • Header for the General Chemistry section erroneously says “Psychology”
  • Both the Organic Chemistry and Graph Practice chapters are labeled as Chapter 7 on their first page
  • Page 23, Question 140: choice D should read “Sinistral, dextral”
  • Page 239, Questions 1438-1439: the introduction to the graph should say “every vertical line represents a one-second interval”
  • Page 344, Question 45 explanation: should say “RNA contains ribose…” instead of “DNA…”
  • Page 493, Question 1252 explanation: 900 mg of CO2 contains 245 mg of carbon, not 270 mg. The calculations for the mass of oxygen should therefore read 1980 mg – 245 mg – 40 mg = 1695 mg oxygen. The cited answer is still correct.
  • Page 499, Question 1303 explanation: Switches the zinc and phosphate concentrations, though the credited answer is still correct. This explanation should read “B is correct. Zinc phosphate has a formula of Zn3(PO4)2. As such, its Kspexpression can be written as Ksp = [Zn2+]3[PO43-]2. Our phosphate and zinc concentrations are 0.005 M and 0.0001 M, respectively; these can be converted to 5 × 10-3 M and 1 × 10-4 M for easier calculations. Now, we simply need to evaluate whether the ion product (a quantity analogous to Q) exceeds the Ksp. (1 × 10-4)3 = 1 × 10-12, while (5 × 10-3)2 = 25 × 10-6. The product of these terms is 25 × 10-18, or 2.5 × 10-17. As this quantity is far greater than the Ksp, this substance will precipitate.
  • Page 516, Question 1421 explanation: should say “C is correct.”
  • Page 520, Question 1451 explanation: should say “D is correct.”

PRACTICE TESTS

Our practice tests update dynamically. You will always be using the most recent version of any test.

 

Scoring Scales

Here is a copy of the score conversion chart for the diagnostic: MCAT Diagnostic Score Conversion Chart 2015-01-18

Our full-length exams will undergo periodic re-norming as we get more data from the AAMC and from students. For now, here is our estimation of what the new scoring scale may look like (excel file): Full Length Scoring Scale