A-LevelBiologyNucleic acids and protein synthesis9700/12 · May/June 2019 · Q211 Mark
The diagram shows part of the DNA sequence of a gene and a mutated sequence of the same gene. normal DNA sequence ...CCG GAT TAT TGC GAG AAA TGG CAT TCT AGG... mutated DNA sequence ...CCG GAT GTA TTG CGA GAA ATG CAT TCT AGG... What are possible effects of the mutated sequence? 1 the presence of mRNA stop codons, UAG, UAA or UGA 2 a change in the sequence of amino acids 3 a non-functional protein 4 ribosomes cannot translate the mRNA
A1, 2 and 3
B1, 3 and 4
C1 and 4 only
D2 and 3 only
✓ Correct answer
D: 2 and 3 only
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