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# A newly discovered disease is thought to be caused by a

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A newly discovered disease is thought to be caused by a [#permalink]

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02 Sep 2011, 09:21
A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data notes that the bacterium thrives in the presence of a certain virus, implying that it is actually the virus that causes the new disease.

Which of the following pieces of evidence would most support the data’s implication?

(A) In the absence of the virus, the disease has been observed to follow infection by the bacterium.
(B) The virus has been shown to aid the growth of bacterium, a process which often leads to the onset of the disease.
(C) The virus alone has been observed in many cases of the disease.
(D) In cases where the disease does not develop, infection by the bacterium is usually preceded by infection by the virus.
(E) Onset of the disease usually follows infection by both the virus and the bacterium.

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02 Sep 2011, 22:40
This question has been posted in this forum for more than 5 times. It's recommended that you search for the question in the forums before posting.

Most of the people like me and everyone else would be interested in some new questions. Who doesn't like new stuff?

B is wrong as it just repeats the premise .
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A newly discovered disease is thought to be caused by a [#permalink]

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18 Jan 2012, 11:09
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A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data notes that the bacterium thrives in the presence of a certain virus, implying that it is actually the virus that causes the new disease.

Which of the following pieces of evidence would most support the data’s implication?

(A) In the absence of the virus, the disease has been observed to follow infection by the bacterium.
(B) The virus has been shown to aid the growth of bacterium, a process which often leads to the onset of the disease.
(C) The virus alone has been observed in many cases of the disease.
(D) In cases where the disease does not develop, infection by the bacterium is usually preceded by infection by the virus.
(E) Onset of the disease usually follows infection by both the virus and the bacterium.

[Reveal] Spoiler:
question: according to CR bible, to support a causal argument, u need to
1- eliminate possible causes
2- show when A happens, B happens
3- when A doesnt happen, B doesn't happen
4- show that the relationship is not reversed
5--6--7 etc.
in this case I chose B, which confirmed that A caused B, when A happens B happens. I am not sure why its wrong. I am so upset

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Last edited by Narenn on 31 Oct 2013, 12:40, edited 1 time in total.
Necessary corrections for 'Bumping for review' project

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Re: A newly discovered disease is thought [#permalink]

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18 Jan 2012, 14:25
The conclusion as given in the last statement is - Virus causes the disease and not the bacterium.
Option C supports this conclusion by highlighting that in many cases, even in the absence of the bacteria, the disease can be caused only by the virus.

This is not a Causal argument. Infact the conclusion negates the cause and anything that harms the causal relationship will strengthen the overall argument.
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Re: A newly discovered disease is thought [#permalink]

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18 Jan 2012, 15:32
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This is a tricky question - it is LSAT after all.

Let's take a look at (B). It says that the virus causes the bacteria to grow, a process followed by the onset of the disease. So this is not a simple cae of A causes B. Instead A (the virus) causes B (the bacteria) and then C (the disease) is observed.

We want an answer choice in which only A (the virus) appears with B (the disease).

(C) states that the virus alone has been observed by the disease. Without the presence of the bacterium confounding the causal chain, (C) provides the strongest support that the virus causes the disease.

Hope that helps
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Re: A newly discovered disease is thought [#permalink]

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19 Jan 2012, 00:39
+ 1 C.
C is clearly supporting the conclusion.
B and the sentence "recently released data notes that the bacterium thrives in the presence of a certain virus" are same , thus B is merely reinstating the premise...
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Re: A newly discovered disease is thought [#permalink]

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23 Mar 2012, 23:03
it is clear from ChrisLele explanation.
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30 Oct 2013, 14:07
raghavakumar85 wrote:
This question has been posted in this forum for more than 5 times. It's recommended that you search for the question in the forums before posting.

Most of the people like me and everyone else would be interested in some new questions. Who doesn't like new stuff?

B is wrong as it just repeats the premise .

I agree with 85 here. Let's not get lazy and start searching.
We need to show how virus causes the disease in absence of bacteria.

Cheers
J

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A newly discovered disease is thought to be caused by a certain bact [#permalink]

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23 Feb 2016, 09:50
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A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data note that the bacterium thrives in the presence of a certain virus, implying that it is actually the virus that causes the new disease.

Which of the following pieces of evidence would most support the data’s implication?

(A) In the absence of the virus, the disease has been observed to follow infection by the bacterium.

(B) The virus has been shown to aid the growth of bacteria, a process which often leads to the onset of the disease.

(C) The virus alone has been observed in many cases of the disease.

(D) In cases where the disease does not develop, infection by the bacterium is usually preceded by infection by the virus.

(E) Onset of the disease usually follows infection by both the virus and the bacterium.
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Re: A newly discovered disease is thought to be caused by a certain bact [#permalink]

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23 Feb 2016, 10:41
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carcass wrote:
A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data note that the bacterium thrives in the presence of a certain virus, implying that it is actually the virus that causes the new disease.

Which of the following pieces of evidence would most support the data’s implication?

(A) In the absence of the virus, the disease has been observed to follow infection by the bacterium.

(B) The virus has been shown to aid the growth of bacteria, a process which often leads to the onset of the disease.

(C) The virus alone has been observed in many cases of the disease.

(D) In cases where the disease does not develop, infection by the bacterium is usually preceded by infection by the virus.

(E) Onset of the disease usually follows infection by both the virus and the bacterium.

Based on the highlighted portion and after massive elimination process I go for (C).
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A newly discovered disease is thought to be caused by a certain bact [#permalink]

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23 Feb 2016, 18:12
A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data note that the bacterium thrives in the presence of a certain virus, implying that it is actually the virus that causes the new disease.

Which of the following pieces of evidence would most support the data’s implication?

(A) In the absence of the virus, the disease has been observed to follow infection by the bacterium. - <Means bacteria is contributing which is not the case. Stem says its only the virus is responsible and in the presence of virus the bacteria will grow.>

(B) The virus has been shown to aid the growth of bacteria, a process which often leads to the onset of the disease. <Initially chose this. But bacteria needs virus its not the virus is making the bacteria to grow. For example - In ram's presence sam's professional growth has been extraordinary[Ram is not doing anything for Sam. But the environment is conducive for sam to grow in Ram's presence same as the case mentioned in the argument] is different from Ram made sam to grow professionally [Here Ram is involved in the action of doing things. Same as the case mentioned in the current choice.]>

(C) The virus alone has been observed in many cases of the disease. <Missing the link for bacteria. Its only the virus responsible and no presence of bacteria >

(D) In cases where the disease does not develop, infection by the bacterium is usually preceded by infection by the virus. <this clearly match with the data implication. Virus comes in first. Bacteria thrives for its growth is utilizing the virus presence once the bacteria knows the virus is available>

(E) Onset of the disease usually follows infection by both the virus and the bacterium. It states bacteria is also responsible. Hence wrong.

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Re: A newly discovered disease is thought to be caused by a [#permalink]

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25 May 2016, 05:44
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Re: A newly discovered disease is thought to be caused by a certain bact [#permalink]

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05 Jul 2016, 11:27
(A) In the absence of the virus, the disease has been observed to follow infection by the bacterium. - weakens

(B) The virus has been shown to aid the growth of bacteria, a process which often leads to the onset of the disease. - not clear whether virus or bacteria causes the disease

(C) The virus alone has been observed in many cases of the disease. - in absence of bacteria, virus alone causes the disease - strengthens

(D) In cases where the disease does not develop, infection by the bacterium is usually preceded by infection by the virus. says bacteria caused infection first - weakens

(E) Onset of the disease usually follows infection by both the virus and the bacterium. - weakens

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Re: A newly discovered disease is thought to be caused by a certain bact [#permalink]

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05 Jul 2016, 17:14
The causation chain here is virus then bacteria and disease. The argument is that the virus is the root cause. Without spending a lot of time with other answers I would be going to the answer choices looking for one that is going to state that the virus is the root cause. C is the one that supports this.

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Re: A newly discovered disease is thought to be caused by a certain bact [#permalink]

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05 Jul 2016, 21:02
Can anyone please explain the difference between options 'B' & 'C' as IMO C is actually reiterating the sentence which is already stated in the argument.

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Re: A newly discovered disease is thought to be caused by a certain bact [#permalink]

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05 Jul 2016, 21:29
ynk wrote:
Can anyone please explain the difference between options 'B' & 'C' as IMO C is actually reiterating the sentence which is already stated in the argument.

B states that the virus aids the growth of bacteria. But to support the conclusion that the virus, not the bacterium, is the culprit, we have to search for an answer that shows that the virus can cause damage without the bacteria. Choice C does that and therefore is the correct choice

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A newly discovered disease is thought to be caused by a certain bact [#permalink]

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05 Jul 2016, 22:36
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ynk wrote:
Can anyone please explain the difference between options 'B' & 'C' as IMO C is actually reiterating the sentence which is already stated in the argument.

ynk This is a fairly common GMAT question type I like to call test and control.

Conventional wisdom: If bacteria =>disease
New idea: If virus => bacteria => disease

The new idea is that it's the virus and not the bacteria. What would strengthen this?

Answer: Where the disease is present WITH the virus, but WITHOUT the bacteria

We have "controlled" for the bacteria variable so it has to be the virus, not the bacteria.

Does this make sense?
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Re: A newly discovered disease is thought to be caused by a [#permalink]

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31 Jul 2017, 12:38
Merged topics. Please, search before posting questions!
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Re: A newly discovered disease is thought to be caused by a [#permalink]

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09 Aug 2017, 04:53
Merged topics. Please, search before posting questions!
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Re: A newly discovered disease is thought to be caused by a   [#permalink] 09 Aug 2017, 04:53

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