A-LevelBiologyNucleic acids and protein synthesis9700/12 · Oct/Nov 2025 · Q261 Mark

How is a primary transcript modified to form mRNA?

AIt becomes longer as exons are joined together.

BIt becomes shorter as exons are removed.

CIt becomes longer as introns are joined together.

DIt becomes shorter as introns are removed.

✓ Correct answer

D: It becomes shorter as introns are removed.

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Topic: Nucleic acids and protein synthesis, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2025 Paper 1 Variant 2, question 26.

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