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A-LevelBiologyNucleic acids and protein synthesis9700/12 · May/June 2023 · Q221 Mark

One characteristic of DNA is that it is a universal genetic code. What is meant by a universal genetic code?

AAll living organisms use the same triplet code for amino acids.
BAll DNA triplets code for a different amino acid.
CNot all DNA triplets code for an amino acid.
DAll living organisms contain the same four nucleic acids.

✓ Correct answer

A: All living organisms use the same triplet code for amino acids.

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About this question

Topic
Nucleic acids and protein synthesis, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source
A-Level Biology, May/June 2023 Paper 1 Variant 2, question 22.

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