Lesson: Identifying the Correct Answer

Comment on Identifying the Correct Answer

sir please help with question 2 why c and not e?
gmat-admin's picture

Question link: https://gmatclub.com/forum/australian-researchers-have-discovered-electr...

2. Which of the following can be inferred about the experiment described in the first paragraph?

(A) Researchers had difficulty verifying the existence of electroreceptors in the anteater because electroreceptors respond to such a narrow range of electrical field strengths.
(B) Researchers found that the level of nervous activity in the anteater’s brain increased dramatically as the strength of the electrical stimulus was increased.
(C) Researchers found that some areas of the anteater’s snout were not sensitive to a weak electrical stimulus.
(D) Researchers found that the anteater’s tactile receptors were more easily excited by a strong electrical stimulus than were the electroreceptors.
(E) Researchers tested small areas of the anteater’s snout in order to ensure that only electroreceptors were responding to the stimulus.

The passage tells us that "...researchers have discovered electroreceptors CLUSTERED AT THE TIP of the anteater’s snout."

If the electroreceptors CLUSTERED AT THE TIP, then this suggests that SOME areas of the snout do not have electroreceptors, which means some areas are NOT sensitive to a weak electrical stimulus (answer choice C)

Answer choice E cannot be inferred, since the passage contains nothing to support it.
We CAN say that the researchers used a weak electrical stimulus in order the ensure the tactile receptors didn't respond, but this is much different.

Does that help?


sir please provide explanation for q6 and q9(i selected c)
gmat-admin's picture

Hi Manjot,

Here are my responses to questions 6 and 9: https://gmatclub.com/forum/the-national-security-act-of-1947-created-a-n...


sir i got question 5 wrong please explain.
gmat-admin's picture

Question link: https://gmatclub.com/forum/the-discoveries-of-the-white-dwarf-the-neutro...

5. The passage contains information that answers which of the following questions?

I. What is the density limit of the gravitational collapse of neutron stars?
II. At what point in its life cycle does a star begin to contract?
III . What resists the gravitational collapse of a star?

A. I only
B. III only
C. I and II only
D. II and III only
E. I, II, and III

I. What is the density limit of the gravitational collapse of neutron stars?
This question is answered in the part of the passage that says "Gravitational attraction compresses this neutron gas rapidly until a density of 10 tons per cubic inch is reached; at this point the strong nuclear force resists further contraction."

II. At what point in its life cycle does a star begin to contract?
This question is answered in the part of the passage that says "In the life cycle of the star, after all of the hydrogen and helium fuel has been burned, the delicate balance between the outer nuclear radiation.pressure and the stable gravitational force becomes disturbed and slow contraction begins."

III. What resists the gravitational collapse of a star?
This question is answered in the part of the passage that says "But if the original star was more massive than a few solar masses, even the strong nuclear forces cannot resist the gravitational crunch."

Answer: E


sir please explain question 1
gmat-admin's picture

Question link: https://gmatclub.com/forum/green-fluorescent-protein-gfp-is-a-protein-th...

This is not an official GMAT question. I suggest that you stick with official questions are the most accurate representation of what you will see on test day.

THE OFFICIAL SOLUTION: Before we try to find the correct answer for this Application question, let's establish what the relationship mentioned in the question stem is. Our Initial Reading points us to the third paragraph, which deals with fluorescence microscopy. Regarding oxygen molecules, we read that the light ... emitted was transferred to oxygen molecules in the cells under examination. This provoked the creation of oxygen radicals that could kill a living cell in seconds. Therefore, we're looking for a relationship in which the second item (oxygen molecules appear second in the question stem) is a part of the first item (cells under examination). The second sentence tells us that the second item can destroy the first if it is somehow provoked. Answer C: The citizens are a part of the state, but may overthrow (destroy) it in a revolt if they are provoked.

Answer: C

C) the relationship between a sovereign state in which the citizens are deliberating a revolt and those citizens

I'm not a big fan of this question.

got question 3 wrong sir why cant it be option d
The current planned use of public monies to save companies with questionable balance sheets, ethics, and business practices, may work in the short run, but the ultimate long-term result will be one of financial insolvency.
for this if in long term they are going to fail then without government support they will surely fail.
gmat-admin's picture

Question link: https://gmatclub.com/forum/the-passage-into-u-s-law-on-october-158078.html

I don't think this question is representative of an official RC question.

This is the problem with 3rd-party questions (especially with Verbal questions).
The official test-makers create an RC question, then they have meetings to discuss, assess, and edit the question. Once they feel that the questions meets GMAC's (the test-maker) high standards, they then include the question in the official test bank as an EXPERIMENTAL question. Once they have sufficient data on the question, the examine that data to see whether it indicates any flaws in the question (ambiguity, lack of clarity, etc.). If there are flaws, they remove the question from the test bank and edit it before collecting even more data.

On average, the test-makers spend $3000 to $5000 on research and the development of EACH question.

The process that 3rd party companies use to create RC questions is much different. In some cases, it's just 1 or 2 people who create the question and then it's added to their test bank.

For this reason, you should stick to official questions.


Hi Brent

In the below question could you help me eliminate the wrong answer chances in question no 278 and 279. My answer choices in these were C and A respectively.

gmat-admin's picture

Question link: https://gmatclub.com/forum/the-function-of-capital-markets-is-to-facilit...
TOUGH passage!!!!

278. The author’s main point is argued by

(A) giving examples that support a conventional generalization
(B) showing that the view opposite to the author’s is self-contradictory
(C) criticizing the presuppositions of a proposed plan
(D) showing that omissions in a theoretical description make it inapplicable in certain cases
(E) demonstrating that an alternative hypothesis more closely fits the data


I don't think I can explain the answer any better than GMATNinja does when we says: Thinking about this structurally, we see that in the first paragraph, the author declares that the conventional theory about capital markets is inaccurate. In the second paragraph, the author shows cases that are omitted by this conventional theory, and therefore can't be explained by that theory. In the third paragraph, the author explains the assumptions that lead to these cases' being omitted during conventional analysis. This structure matches the language in choice (D), and since we've eliminated every other answer choice, (D) is our best answer.


279. A difference in which of the following would be an example of inequality in transaction costs as alluded to in lines 40-43 [Moreover, it is assumed that transaction costs for various types of financial instruments (stocks, bonds, etc.) are equally known and equally divided among all community members.]?

(A) Maximum amounts of loans extended by a bank to businesses in different areas
(B) Fees charged to large and small investors for purchasing stocks
(C) Prices of similar goods offered in large and small stores in an area
(D) Stipends paid to different attorneys for preparing legal suits for damages
(E) Exchange rates in dollars for currencies of different countries

First off, we're looking for an example of inequality in TRANSACTION costs of financial instruments (stocks, bonds, etc.)
C, D and E have nothing to do with financial instruments. So, we can eliminate them.

We're left with A and B.

B mentions fees charged when purchasing STOCKS, and the question cites stocks as a type of financial instrument.
On the other hand, answer choice A talks about LOAN amounts. I'm not sure whether LOANS is a type of financial instrument, so I'm already favoring answer choice B over A.

Also, the question asks for an example of inequality in TRANSACTION COSTS.
Maximum loan amounts (A) is NOT a TRANSACTION COST
Fees charged to purchase stocks (B) IS a TRANSACTION COST

Best answer: B


Yulia's picture

Hi Brent,

Could you please help me to understand something?

Question 5, why is E wrong? Discussions below the passage didnt provide a sufficient explanation. After POA I ended up between A and E but went for E. Still not sure why A is a correct answer.

Thank you.
gmat-admin's picture

Question link: https://gmatclub.com/forum/some-observers-have-attributed-the-dramatic-g...

Question #5: The first sentence in the passage suggests that the “OBSERVERS” mentioned in line 1 would be most likely to predict which of the following?

The first sentence says: Some OBSERVERS have attributed the dramatic growth in temporary employment that occurred in the United States during the 1980s to increased participation in the workforce by certain groups, such as first-time or reentering workers, who supposedly prefer such arrangements.

In other words, an increase in workers preferring temporary employment CAUSED the dramatic growth of temporary employment.
Notice that this conclusion applies to a very SPECIFIC TYPE of worker: Workers who PREFER TEMPORARY EMPLOYMENT

Answer choice E does not refer to workers who PREFER TEMPORARY EMPLOYMENT.
(E) That the number of workers taking temporary positions would increase as more workers in ANY given demographic group entered the workforce
This answer choice says that an increase in ANY KIND of worker will cause growth of temporary employment.
For this reason we can eliminate E

Does that help?

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