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IB Biology HL D1.2.2 Hydrogen Bonding in Transcription Questions

Explore antisense-template pairing, sense-strand checks and mRNA sequence formation during transcription in IB Biology HL D1.2.2.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain that free RNA nucleotides align to the DNA template by complementary base pairing and hydrogen bonding during transcription.
  • Apply DNA adenine–RNA uracil and cytosine–guanine pairing rules to derive the complementary mRNA sequence from a DNA template.
  • Check a transcription representation by matching every base and distinguishing the DNA antisense template from the resulting RNA strand.

IB Biology HL D1.2.2 Hydrogen Bonding in Transcription Questions 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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