plumiProteins: CAIE A‑Level Biology questions
Every CAIE A-Level Biology exam question on 2.3 Proteins, June 2024 and the specimen papers, with its mark scheme and examiner’s report.
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All 5 questions on Proteins, as a list
- June 2024, Paper 1, Q6 (1 mark): The diagrams show the structure of four amino acids in aqueous solution. COO– COO– H C H3N+ CH2 CH2 CH2 CH2 C N+H3 N+H3 H H glycine lysine COO– O COO– CH3 C C C
- June 2024, Paper 1, Q8 (1 mark): Collagen molecules are made up of three polypeptide chains interacting together. The individual polypeptide chains consist of a regular pattern of amino acids.
- June 2024, Paper 1, Q9 (1 mark): The masses of the parts of haemoglobin are shown in the table. component mass / Da -globin chain 15 126 -globin chain 15 868 haem group 617 There are 1000 Da
- Specimen, Paper 1, Q11 (1 mark): The diagram shows the molecular structure of a peptide. O NH2 C CH2 H O CH3 H H C N C C OH N C C N C H H H O CH2 H O OH Which molecules would result from the co
- Specimen, Paper 1, Q12 (1 mark): The diagram shows a haemoglobin molecule. β-globin chain 3 α-globin chain 4 2 α-globin chain β-globin chain 1 Which row identifies the different parts of the mo
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