A-LevelBiologyNucleic acids and protein synthesisMay/June 2019Paper 1 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
The correct answer is D: 2 and 3 only
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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