DP Biology (first assessment 2025)

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Question 22N.1A.SL.TZ0.10

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1A.SL.TZ0.10
Level SL Paper 1A Time zone TZ0
Command term Question number 10 Adapted from N/A
10.
[Maximum mark: 1]
22N.1A.SL.TZ0.10

A DNA triplet on the strand that is transcribed has the bases TAG. Which anticodon on tRNA is used in translation?

A.  AUC

B.  UAG

C.  TAG

D.  ATC

[1]

Markscheme

B

Examiners report

In question 10, candidates were asked to state which bases would be found on a tRNA anticodon transcribed from DNA. The question discriminated poorly with most candidates opting for response A which corresponded to the bases that would be found on the mRNA strand. It was commented that there might be confusion with the use of "the strand that is transcribed" and perhaps using the words coding or template strands would be less ambiguous. Another commented that a diagram may have made the question clearer.

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