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# Light is registered in the retina when photons hit molecules

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Current Student
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Kudos [?]: 118 [1] , given: 264

Light is registered in the retina when photons hit molecules [#permalink]  19 Sep 2012, 02:27
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Difficulty:

35% (medium)

Question Stats:

60% (02:17) correct 39% (01:48) wrong based on 91 sessions
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, rhodopsin 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 conclusion 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.
[Reveal] Spoiler: OA

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Last edited by getgyan on 19 Sep 2012, 04:03, edited 1 time in total.
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Re: Light is registered in the retina [#permalink]  19 Sep 2012, 03:59
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Expert's post
B should be the answer. It was pretty tough

molecular motion depends on temperature. if this one changes then molecular has more error and in this case light do not come into the picture.

we have to establish a connection betwwen movements, hot, shape and errors
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Re: Light is registered in the retina [#permalink]  19 Sep 2012, 07:06
1
KUDOS
A – A relationship is established in the arguement between molecular montion and temperature. This answer talks about light absorption and temperature. Eliminate
B – Yes sir!
C – Remember what the relationship is between: molecular motion and temperate are proportional. Increase one and you’ll increase the other. What is this answer proclaming? An increase in temperature leads to a decrease in reactivity. Oposite answer. Eliminate
D – This answer is trying to trick you into thinking that an animal with large eyes and therefore will have more erroneous molecule shape changes, but it’s actually saying that the actual molecules are more sensitive. There is no mention of this in the argument. Eliminate.
E – Woah! This is well out of scope. Eliminate.

B.
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Re: Light is registered in the retina when photons hit molecules [#permalink]  11 Apr 2014, 03:35
this was pretty hard for me...i couldnt figure it out at all.....
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Re: Light is registered in the retina when photons hit molecules [#permalink]  11 Apr 2014, 09:37
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, rhodopsin 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 conclusion 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.

"B" FOR ME.....
Re: Light is registered in the retina when photons hit molecules   [#permalink] 11 Apr 2014, 09:37
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