DP Biology (first assessment 2025)

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Question 22M.1A.HL.TZ1.28

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.HL.TZ1.28
Level HL Paper 1A Time zone TZ1
Command term Question number 28 Adapted from N/A
28.
[Maximum mark: 1]
22M.1A.HL.TZ1.28

This DNA sequence was used to synthesize a polypeptide.

DNA (sense strand): 3′ T A C T G A 5′

DNA (template strand): 5′ A T G A C T 3′

Which are the bases of the tRNA (anticodons)?

A. T A C   T G A

B. U A C   U G A

C. A U G   A C U

D. A T G   A C T

[1]

Markscheme

C

Examiners report

The discrimination index for this question was low, and as only 44 % answered correctly, the explanation was not that it was too easy. The question asked for the bases of the anticodons used to produce a polypeptide. They will be complementary to the DNA sense strand, because it will have the same base sequence (apart from T/U) as the codons of the mRNA that is translated into the polypeptide. B was almost as popular as the correct answer, but gives the codons, rather than the anticodons.

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