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# Light is registered in the retina when

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Intern
Joined: 05 Oct 2013
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GMAT 1: 650 Q49 V30
Light is registered in the retina when [#permalink]

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Updated on: 19 Jun 2018, 12:04
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35% (medium)

Question Stats:

71% (01:31) correct 29% (02:00) wrong based on 611 sessions

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Light is registered in the retina when photons hit molecules of the pigment rhodopsin and change the molecules' shape. Even when they have not been struck by photons of light, rhydopsin molecules sometimes change shape because of normal molecular motion, thereby introducing error into the visual system. The amount of this molecular motion is directly proportional to the temperature of the retina.

Which one of the following conclusions is most strongly supported by the information above?

A) The temperature of an animal's retina depends on the amount of light the retina is absorbing.

B) The visual systems of animals whose body temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones.

C) As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons.

D) Rhodopsin molecules are more sensitive to photons in animals whose retinas have large surface areas than in animals whose retinas have small surface areas?

E) Molecules of rhodopsin are the only pigment molecules that occur naturally in the retina.

Hi Everyone

I have a doubt a read it in the MGMAT guides that for must be true questions an answer choice that introduces new information is considered wrong.
Then why in this question the correct answer is B and not C where in the stimulus have they mentioned animals??

Originally posted by amyjohn on 17 Feb 2014, 21:51.
Last edited by Skywalker18 on 19 Jun 2018, 12:04, edited 1 time in total.
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Re: Light is registered in the retina when [#permalink]

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18 Feb 2014, 00:05
We can't really deduce C as it says that As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons while stem says that The amount of this molecular motion is directly proportional to the temperature of the retina. To me, I inferred this as -as temperature of the retina rises, rhodopsin molecules' motion will increase.

But at the same time B also doesn't look good either as it says that The visual systems of animals whose body temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones. The stem never mentions that temperature of the retina will be same as that of body. In a way, we might apply common sense here but not sure if we can have this common sense assumption which is never stated or rephrased in the stem. Moreover, as you mentioned the stem never says anything about animals specifically.

Would like expert inputs here!! Will be helpful
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Re: Light is registered in the retina when [#permalink]

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18 Feb 2014, 01:31
Yeah you are right but why B that is the question since no where in the stimulus animals are mentioned ?
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Re: Light is registered in the retina when [#permalink]

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18 Feb 2014, 06:41
Though I chose C, I agree C doesn't look deducible. But B don't look good either. It talks about animals & body temperature without making a link to retina. The only plus in B is it talks about visual systems being more error prone in hotter surroundings than colder ones.
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Re: Light is registered in the retina when [#permalink]

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18 Feb 2014, 20:24
Yes you are right that C does not look any good either and The only plus in B is it talks about visual systems being more error prone in hotter surroundings than colder ones.
But again the mystery of new info is still unresolved.

Can experts please bump in to throw more light on this?
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Re: Light is registered in the retina when [#permalink]

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06 Aug 2014, 03:48
both B and C look bad options to me but B has a slight edge because it talks about the proportionality and C talks about the effect of temperature on rhodopsin molecules & photons which is not discussed in the argument
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Re: Light is registered in the retina when [#permalink]

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28 Aug 2014, 23:50
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amyjohn wrote:
Hi Everyone

I have a doubt a read it in the MGMAT guides that for must be true questions an answer choice that introduces new information is considered wrong.
Then why in this question the correct answer is B and not C where in the stimulus have they mentioned animals??

Light is registered in the retina when photons hit molecules of the pigment rhodopsin and change the molecules' shape. Even when they have not been struck by photons of light, rhydopsin molecules sometimes change shape because of normal molecular motion, thereby introducing error into the visual system. The amount of this molecular motion is directly proportional to the temperature of the retina.

Which one of the following conclusions is most strongly supported by the information above?

A) The temperature of an animal's retina depends on the amount of light the retina is absorbing.

B) The visual systems of animals whose body temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones.

C) As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons.

D) Rhodopsin molecules are more sensitive to photons in animals whose retinas have large surface areas than in animals whose retinas have small surface areas?

E) Molecules of rhodopsin are the only pigment molecules that occur naturally in the retina.

Hi guys,
Lemme try to attempt this one! I marked B though ( I agree that "animal" threw me also off)

A .The temperature of an animal's retina depends on the amount of light the retina is absorbing. -- Nowhere does it states that about the amount of light that gets absorbed. It just talks about the light photons being hit. INCORRECT

B. The visual systems of animals whose body temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones. - Assume that a particular animal lives in hot surroundings and itself has high body temperature and therefore "high retina temperature"(retina being a part of body) too. Now, higher the temp of retina, higher the molecular motion(something that is stated in the stimulus). Vice-versa can be sad about cold temperatures. MAKES SENSE.

C) As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons. -- Reaction was never talked about. INCORRECT

D) Rhodopsin molecules are more sensitive to photons in animals whose retinas have large surface areas than in animals whose retinas have small surface areas.--Surface areas was never talked about. INCORRECT

E) Molecules of rhodopsin are the only pigment molecules that occur naturally in the retina. --- Only pigment? No one said that ! INCORRECT

Let me know if it helped!
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Re: Light is registered in the retina when [#permalink]

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28 Aug 2014, 23:59
amyjohn wrote:
Yes you are right that C does not look any good either and The only plus in B is it talks about visual systems being more error prone in hotter surroundings than colder ones.
But again the mystery of new info is still unresolved.

Can experts please bump in to throw more light on this?

Hi amyjohn,

According to me, mystery can be solved somewhat as -
Option C, D and E gives you the info which is new and something that cannot be derived or deduced from the passage!. However in A, B the word "animal" does sound like a new info certainly, but how can we be so sure that the stimulus given is "not about animals". It nowhere mentions "human" or for that matter animal too. So may be stimuli is all about animals only , so I believe it should not be considered new info.
This can be only understood once u take a second look at the stimulus.

Let me know if this helped
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Re: Light is registered in the retina when [#permalink]

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27 Dec 2015, 11:09
The biggest problem with this question is that there is no way for us to deduct that body temperature corresponds to retina temperature. If we were sure about that link, then of course B makes perfect logical sense. But we are not sure, so this answer, according to PowerScore reasoning, might be true and might not be true, which itself isn't bullet proof answer.

For sure I might be missing something and would appreciate if any expert could shed a light on that one.

Btw, all other answers are even less sound than answer B, so in the end I chose B myself as well. Overall very nice good question with this little mistake - one premise is imo missing.

Thanks,
Jay
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Re: Light is registered in the retina when [#permalink]

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29 Dec 2015, 02:28
First of all People should stop worrying about this CR, because this CR comes under the LSAT in MGMAT.
There is a lot of structural and analytical difference between the LSAT and GMAT questions.
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Re: Light is registered in the retina when [#permalink]

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29 Dec 2015, 04:03
MrSobe17, notice that the question just asks us for a "strongly supported" conclusion. This will usually be a pretty solid inference, but some small uncertainty can remain. Here, we do have to know that the retina doesn't somehow stay low even as the animal's body temperature rises with its surroundings. However, since the retina is part of the animal's body, this is not a really glaring problem.

Yes, this is an LSAT question, but it's still a high-quality question, and we could see something quite a bit like this on the GMAT. Here's an example of an official GMAT question that requires us to make a bit of an assumption to reach the correct answer: although-aspirin-has-been-proven-to-eliminate-moderate-fever-45670.html
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Re: Light is registered in the retina when [#permalink]

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29 Dec 2015, 06:15
Thank you Dmitry for clarification and additional question.

Best,
Jay
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Re: Light is registered in the retina when [#permalink]

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11 Apr 2018, 23:47
Light is registered in the retina when photons hit molecules of the pigment rhodopsin and change the molecules' shape. Even when they have not been struck by photons of light, rhydopsin molecules sometimes change shape because of normal molecular motion, thereby introducing error into the visual system. The amount of this molecular motion is directly proportional to the temperature of the retina.

Which one of the following conclusions is most strongly supported by the information above?[/quote]

The mistake one can do in this question is rejecting the answer choice on the basis of word "animal" . The same I did.
But if you read closely and completely, only (B) makes sense. All others are either extreme or not supported by the passage.

A) The temperature of an animal's retina depends on the amount of light the retina is absorbing.

B) The visual systems of animals whose body temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones.

C) As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons.

D) Rhodopsin molecules are more sensitive to photons in animals whose retinas have large surface areas than in animals whose retinas have small surface areas?

E) Molecules of rhodopsin are the only pigment molecules that occur naturally in the retina.

It's (B)
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Re: Light is registered in the retina when   [#permalink] 11 Apr 2018, 23:47
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