DP Biology (last assessment 2024)

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Question 22N.1.SL.TZ0.24

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1.SL.TZ0.24
Level SL Paper 1 Time zone TZ0
Command term Question number 24 Adapted from N/A
24.
[Maximum mark: 1]
22N.1.SL.TZ0.24

A short sequence of amino acids (represented by letters) in cytochrome c is shown for six vertebrates. Letters in bold indicate identical amino acids for all species.

Which statement refers to this section of cytochrome c?

A.  The DNA base sequences for human and rhesus monkey are different.

B.  The most DNA base changes are between humans and snapping turtles.

C.  The largest number of amino acid differences is two.

D.  The amino acid at position 32 is the most variable.

[1]

Markscheme

D

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