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A newly discovered disease is thought to be caused by a certain bacter

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

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New post 23 Apr 2010, 15:50
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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(prosper) 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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Re: A newly discovered disease is thought to be caused by a certain bacter  [#permalink]

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New post 18 Nov 2010, 07:52
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poohv005 wrote:
A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data notes that the bacterium thrives(prosper) 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.

please explain the answer.


Let's focus on the question first because that is all that is relevant to us. (In fact, it helps to read the question first so that you can read the argument with the question in perspective)
Which of the following pieces of evidence would most support the data’s implication?

Now, before we move on, what is data's implication?
implying that it is actually the virus that causes the new disease.

Now you have to pick an answer choice which best supports 'it is actually the virus that causes the disease'. Focus on that.

Option (C) clearly states that the virus alone has been found in many cases. Then it must be the virus that causes the disease.
It does not conflict with the premise above - 'A newly discovered disease is thought to be caused by a certain bacterium.' The premise does not say that it is caused by the bacterium. It only says that it is thought to be caused by the bacterium.

Option (B) doesn't strengthen that it is actually the virus that causes the disease. It says that the virus aids the growth of bacterium and this growth leads to development of the disease. The cause of the disease is still the bacterium. That is, if the bacterium weren't present, the virus probably couldn't do anything alone. (Note the probably here. This statement doesn't say that the virus alone cannot do anything but it also doesn't say that the virus alone can cause the disease) But we want to strengthen that it is actually the virus which is the cause.
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Re: A newly discovered disease is thought to be caused by a certain bacter  [#permalink]

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New post 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 to be caused by a certain bacter  [#permalink]

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

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New post 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 certain bacter  [#permalink]

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New post 16 May 2016, 13:48
VeritasPrepKarishma wrote:
poohv005 wrote:
A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data notes that the bacterium thrives(prosper) 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.

please explain the answer.


Let's focus on the question first because that is all that is relevant to us. (In fact, it helps to read the question first so that you can read the argument with the question in perspective)
Which of the following pieces of evidence would most support the data’s implication?

Now, before we move on, what is data's implication?
implying that it is actually the virus that causes the new disease.

Now you have to pick an answer choice which best supports 'it is actually the virus that causes the disease'. Focus on that.

Option (C) clearly states that the virus alone has been found in many cases. Then it must be the virus that causes the disease.
It does not conflict with the premise above - 'A newly discovered disease is thought to be caused by a certain bacterium.' The premise does not say that it is caused by the bacterium. It only says that it is thought to be caused by the bacterium.

Option (B) doesn't strengthen that it is actually the virus that causes the disease. It says that the virus aids the growth of bacterium and this growth leads to development of the disease. The cause of the disease is still the bacterium. That is, if the bacterium weren't present, the virus probably couldn't do anything alone. (Note the probably here. This statement doesn't say that the virus alone cannot do anything but it also doesn't say that the virus alone can cause the disease) But we want to strengthen that it is actually the virus which is the cause.


Hi, the data's implication is indeed "it's the virus that CAUSES the new disease", but no where in option C it mentions that virus is the CAUSE, it just mentions that the virus has been found in many cases.

I rejected the option on these grounds, do tell me where I went wrong.

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

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New post 17 May 2016, 00:38
rohitt911 wrote:
VeritasPrepKarishma wrote:
poohv005 wrote:
A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data notes that the bacterium thrives(prosper) 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.

please explain the answer.


Let's focus on the question first because that is all that is relevant to us. (In fact, it helps to read the question first so that you can read the argument with the question in perspective)
Which of the following pieces of evidence would most support the data’s implication?

Now, before we move on, what is data's implication?
implying that it is actually the virus that causes the new disease.

Now you have to pick an answer choice which best supports 'it is actually the virus that causes the disease'. Focus on that.

Option (C) clearly states that the virus alone has been found in many cases. Then it must be the virus that causes the disease.
It does not conflict with the premise above - 'A newly discovered disease is thought to be caused by a certain bacterium.' The premise does not say that it is caused by the bacterium. It only says that it is thought to be caused by the bacterium.

Option (B) doesn't strengthen that it is actually the virus that causes the disease. It says that the virus aids the growth of bacterium and this growth leads to development of the disease. The cause of the disease is still the bacterium. That is, if the bacterium weren't present, the virus probably couldn't do anything alone. (Note the probably here. This statement doesn't say that the virus alone cannot do anything but it also doesn't say that the virus alone can cause the disease) But we want to strengthen that it is actually the virus which is the cause.


Hi, the data's implication is indeed "it's the virus that CAUSES the new disease", but no where in option C it mentions that virus is the CAUSE, it just mentions that the virus has been found in many cases.

I rejected the option on these grounds, do tell me where I went wrong.

Regards
RT



Option (C) SUPPORTS (improves the probability) the data's implication. You do not require to prove that data's implication is true beyond doubt. All you need to do is support it. Hence (C) is correct. If you did reject it on the grounds you mentioned, which option did you select?
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Re: A newly discovered disease is thought to be caused by a certain bacter  [#permalink]

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New post 17 May 2016, 01:57
Option (C) SUPPORTS (improves the probability) the data's implication. You do not require to prove that data's implication is true beyond doubt. All you need to do is support it. Hence (C) is correct. If you did reject it on the grounds you mentioned, which option did you select?[/quote]

I marked B, because i thought it says the GROWTH of bacterium causes the disease and not only the bacterium. And the growth of bacterium is because of the virus, hence the virus causes the disease.
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Re: A newly discovered disease is thought to be caused by a certain bacter  [#permalink]

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New post 17 May 2016, 02:39
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rohitt911 wrote:

I marked B, because i thought it says the GROWTH of bacterium causes the disease and not only the bacterium. And the growth of bacterium is because of the virus, hence the virus causes the disease.



What is data's implication?
It is actually the virus that causes the new disease.

Now you have to pick an answer choice which best supports 'it is actually the virus that causes the disease'. Focus on that.

Option (B) doesn't strengthen that it is actually the virus that causes the disease. It says that the virus aids the growth of bacterium and this growth leads to development of the disease. The cause of the disease is still the bacterium. That is, if the bacterium weren't present, the virus probably couldn't do anything alone. (Note the probably here. This statement doesn't say that the virus alone cannot do anything but it also doesn't say that the virus alone can cause the disease) But we want to strengthen that it is actually the virus which is the cause.
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Re: A newly discovered disease is thought to be caused by a certain bacter  [#permalink]

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New post 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 bacter  [#permalink]

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New post 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 bacter  [#permalink]

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New post 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 certain bacter &nbs [#permalink] 05 Jul 2016, 22:36
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