Scientists studying a common type of bacteria have discovered that most bacteria of that type are in hibernation at any given time. Some microbiologists have concluded from this that bacteria in general are usually in hibernation. This conclusion would be reasonable if all types of bacteria were rather similar. But, in fact, since bacteria are extremely diverse, it is unlikely that most types of bacteria hibernate regularly.

Summarize Argument: Counter-Position
It is unlikely that most types of bacteria hibernate regularly. Some microbiologists claim that most bacteria hibernate regularly, but they base that off of a study of one type of bacteria - which is a problem because types of bacteria are different, not similar.

Identify Conclusion
The conclusion is the author’s claim about bacterial hibernation: “it is unlikely that most types of bacteria hibernate regularly.”

A
Bacteria of most types are usually in hibernation.
This is the claim of some microbiologists that the author refutes.
B
It is probably not true that most types of bacteria hibernate regularly.
This accurately rephrases the conclusion that it is unlikely (probably not true) that most types of bacteria hibernate regularly.
C
If bacteria are extremely diverse, it is unlikely that most types of bacteria hibernate regularly.
The “if” statement makes this answer choice incorrect. The author establishes that bacteria are extremely diverse in a premise. The conclusion of the argument is not conditional.
D
The conclusion that bacteria in general are usually in hibernation would be reasonable if all types of bacteria were rather similar.
This is a premise that sets up why that conclusion is not reasonable. The author combines this with the fact that bacteria are diverse to refute that conclusion.
E
It is likely that only one type of bacteria hibernates regularly.
This answer choice goes too far. The author concludes that it is unlikely that most types hibernate regularly, but that does not mean that only type does.

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In a study, one group of volunteers was fed a high-protein, low-carbohydrate diet; another group was fed a low-protein, high-carbohydrate diet. Both diets contained the same number of calories, and each volunteer’s diet prior to the experiment had contained moderate levels of proteins and carbohydrates. After ten days, those on the low-carbohydrate diet had lost more weight than those on the high-carbohydrate diet. Thus, the most effective way to lose body fat is to eat much protein and shun carbohydrates.

Summarize Argument
The author concludes that the most effective way to lose body fat is by eating high-protein, low-carbohydrate diets. Her evidence is a study that shows volunteers who hate high-protein, low-carbohydrate diets lost more weight after ten days than those eating low-protein, high-carbohydrate diets.

Notable Assumptions
By concluding that people should “eat protein and shun carbohydrates” in order to lose body fat, the author assumes that there’s no middle-ground where one eats both protein and carbohydrates in moderation. She also assumes that all other relevant factors (i.e. exercise, sleep) were relevant between the groups during the study. Finally, the author assumes that losing weight is the same thing as losing body fat.

A
A low-protein, high-carbohydrate diet causes the human body to retain water, the added weight of which largely compensates for the weight of any body fat lost, whereas a high-protein, low-carbohydrate diet does not.
The low-protein, high-carbohydrate diet increases water retention, to the extent that the retained water compensates in total weight for any loss of body fat. Thus, the author can’t conclude that the high-protein group lost more body fat than the other group.
B
Many people who consume large quantities of protein nevertheless gain significant amounts of body fat.
We’re talking people on calorie-restricted diets. We don’t care how high-protein diets work out in calorie excess.
C
A high-protein, low-carbohydrate diet will often enable the human body to convert some body fat into muscle, without causing any significant overall weight loss.
Regardless of the other effects of a high-protein diet, we don’t really care about body composition. We need to know weaken the idea that high-protein diets are best for fat loss.
D
In the experiment, the volunteers on the high-carbohydrate diet engaged in regular exercise of a kind known to produce weight loss, and those on the low-carbohydrate diet did not.
If anything, this supports the author’s argument. The high-carbohydrate volunteers were exercising and yet still didn’t lose as much weight as the high-protein volunteers.
E
Many of the volunteers who had been on the low-carbohydrate diet eventually regained much of the weight they had lost on the diet after returning to their normal diets.
It doesn’t matter what happened once they returned to their usual diets. We’re concerned about how the diets affected their body fat loss.

23 comments

The question stem reads: The reasoning in the board member’s argument is vulnerable to criticism on grounds that the argument… This is a Flaw question.

The board member begins by claiming that the J Foundation issued “you” this grant on the condition that the resulting work did not contain anything detrimental to the J Foundation’s reputation. In other words, meeting the conditions of the grant requires that “your” work not contain anything harmful to J Foundation’s reputation. However, the board member notes that the resulting work does not mention anything positive about the J Foundation. The board member concludes that “you” have failed to meet the conditions of the grant.

Here we have a very common flaw in the LSAT: assuming that negation and opposition are the same. The board member assumes that no positive information must mean the existence of negative information. However, positive information could also imply that the information in the work was simply neutral: the information was neither good nor bad for the J Foundation’s reputation. If the resulting work was neutral, then “you” would not violate the conditions of the grant. Let’s move to the answer choices.

Answer Choice (A) is incorrect. Whether or not the work has Intellectual value has nothing to do with the board member’s argument.

Answer Choice (B) is incorrect. The author does not confuse the necessary condition of “no harmful information” for being sufficient to issue the grant.

Correct Answer Choice (C) is what we discussed. The board member has assumed that failing to mention the laudable achievements of J Foundation amounts to harming the reputation of J Foundation.

Answer Choice (D) is something the argument fails to consider, but that is not why the argument is flawed.

Answer Choice (E) is also something that the argument does not consider, but (E) is not a problem for the argument. If you failed to satisfy the necessary condition of “no harmful information,” it would not matter how many other conditions were met. The problem is that we do not know if the work actually contained harmful information.

 


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