IB Biology HL A1.2.10 Conservation of Genetic Code Questions

Practise IB Biology HL A1.2.10 by evaluating universal-code evidence and exceptions, then linking codon translation to gene transfer.

Exam points

Evaluate evidence that mRNA codons are assigned to the same amino acids in different species, supporting a universal genetic code.
Explain why transferred genes can produce unchanged polypeptide amino-acid sequences when the genetic code is shared.

[Maximum number: 1]

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

Uracil replaces thymine in RNA

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

Nucleic acids contain the same bases in all species

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

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