LSAT 110 – Section 3 – Question 19

LSAT 110 - Section 3 - Question 19

June 2001

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Question QuickView	Type	Tags	Answer Choices	Curve	Question Difficulty	Psg/Game/S Difficulty	Explanation
PT110 S3 Q19	+LR	Most strongly supported +MSS Causal Reasoning +CausR Math +Math	A 7% 162 B 80% 168 C 6% 160 D 6% 161 E 1% 161	142 152 162	+Medium	145.976 +SubsectionMedium

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.

Summary

In the retina, light is registered when photons make contact with molecules of rhodopsin and cause the molecules to change shape. Rhodopsin molecules sometimes change shape caused by normal molecular motion, which causes errors in the visual system. The amount of normal molecular motion is directly proportional to the temperature of the retina.

Strongly Supported Conclusions

The warmer the retina, the higher the chance that errors in the visual system occur.

The temperature of an animal’s retina depends on the amount of light the retina is absorbing.

This answer is not supported. We don’t know whether the amount of light the retina absorbs actually causes the retina to change in temperature.

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

This answer is strongly supported. If the amount of normal molecular motion that causes visual errors is proportional to the temperature of the retina, then the warmer an animals’ environment the more error-prone that animal’s visual system is.

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

This answer is unsupported. We don’t know from the stimulus how quickly rhodopsin reacts after being struck by photons.

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

This answer is unsupported. We don’t know from the stimulus if the surface area of an animal’s retina is correlated with the sensitivity of rhodopsin molecules.

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

This answer is unsupported. We don’t know whether rhodopsin is the only pigment molecule. We only know that it is an example of a naturally occurring pigment molecule.

LSAT 110 – Section 3 – Question 19

LSAT 110 - Section 3 - Question 19

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LSAT PrepTest 110 Explanations

Section 1 - Reading Comprehension

Section 2 - Logical Reasoning

Section 3 - Logical Reasoning

Section 4 - Reading Comprehension

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