DP Biology (last assessment 2024)

Test builder »

Question 23M.1.HL.TZ2.23

Select a Test
Date May 2023 Marks available [Maximum mark: 0] Reference code 23M.1.HL.TZ2.23
Level HL Paper 1 Time zone TZ2
Command term Question number 23 Adapted from N/A
23.
[Maximum mark: 0]
23M.1.HL.TZ2.23

What happens to an RNA molecule in eukaryotes after transcription in order to process it into mRNA?

A.  Introns are added.

B.  Exons are removed.

C.  Adenine nucleotides are added at the 3’ end.

D.  Adenine nucleotides are removed from the 5’ end.

Markscheme

C

Examiners report

This question on transcription produced many comments that the content was beyond the scope of the syllabus. The question came from section 7.2 'Eukaryotic cells modify mRNA after transcription'. It is accepted that the question may have required more understanding but despite this, the question discriminated well and 51% of the candidates gave the correct response.