SAT Subject Biology Practice Question 438: Answer and Explanation

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Question: 438

8. The following data table shows the number of different amino acids in the beta hemoglobin chain of various organisms compared to the human beta chain.

OrganismNumber of different amino acids
Human0
Mouse27
Frog68
Monkey11
Lamprey125
Chicken35
Gibbon2

To which of the following organisms are humans m

A. Mouse
B. Monkey
C. Chicken
D. Gibbon
E. Lamprey

Correct Answer: D

Explanation:

D Because the human hemoglobin and the gibbon hemoglobin differ by only two amino acids, these two organisms (of the ones listed) are the most closely related.

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