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IB Biology HL 1.2.2 Transcription pairing and sequence inference Question Bank

Practise IB Biology HL 1.2.2 by analysing DNA strand orientation and deducing mRNA sequences with precise base-pairing evidence.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Deduce mRNA from an antisense strand and infer the corresponding sense strand.
  • Check 3′/5′ orientation, uracil pairing and sequence direction in a transcription problem.
  • Evaluate a proposed transcript by tracing every complementary base and strand relationship.

D1.2.2—Hydrogen bonding in transcription question 1

[Maximum number: 1]

The sequence of bases on a short section of the antisense strand of a gene undergoing transcription is shown:

5′ CATG 3′5^{\prime} \text { CATG } 3^{\prime}

What is the sequence of bases on the resulting mRNA?

A

3′3^{\prime} CATG 5′5^{\prime}

B

5' GUAC 3'

C

3′3^{\prime} GUAC 5′5^{\prime}

D

3′GTAC3^{\prime} \mathrm{GTAC} 5'

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