A-LevelBiologyNucleic acids and protein synthesisOct/Nov 2022Paper 1 Q231 Mark
A section of the polypeptide coding for the haemoglobin β-chain contains the following amino acids. – Pro – Glu – Glu – Patients with sickle cell anaemia have mutated β-polypeptide chains. The section of the mutated polypeptide contains the following amino acids. – Pro – Val – Glu – The table shows the possible anticodons for Val. amino acid: Val, anticodon: CAA; amino acid: Val, anticodon: CAG; amino acid: Val, anticodon: CAC; amino acid: Val, anticodon: CAU. What is the corresponding DNA triplet code for the substituted amino acid in the mutated polypeptide?
AGTT
BGAC
CCTC
DCAT
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The correct answer is D. This question tests the candidate's understanding of nucleic acids and protein synthesis within the Biologysyllabus. The examiner's mark scheme requires...
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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...
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