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IB Biology HL A1.2.10 Conservation of Genetic Code Questions

Explain how the 64 codons have nearly the same meanings across life and how conserved genes for transcription, translation and ribosomes support common ancestry. Describe how synonymous mutations can preserve amino acid sequences.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain that the 64 codons have nearly the same meanings across life.
  • Use conserved genes for transcription, translation and ribosomes as evidence supporting common ancestry.
  • Explain how synonymous mutations can preserve an amino acid sequence.

IB Biology HL A1.2.10 Conservation of Genetic Code Questions question 1

[Maximum number: 1]

What provides evidence for the universal nature of the genetic code?

A

Uracil replaces thymine in RNA

B

The amount of A is equal to the amount of T and the amount of G is equal to the amount of C

C

Nucleic acids contain the same bases in all species

D

mRNA codons are assigned to the same amino acids in different species

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