May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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12Proteins Amino AcidsHard1 mark
The diagram represents part of a protein molecule showing some R-groups and their interactions.
Diagram of part of a folded polypeptide chain (drawn as a beaded string) with two labelled side-chain interactions: interaction 1 is between two branched hydrocarbon (CH$_3$-containing) R-groups projecting from the chain near the top; interaction 2 is between two sulfur-containing R-groups (each drawn as C-S) projecting from the chain lower down.
Which row is correct for interactions 1 and 2?
interaction 1interaction 2
Acovalent bondhydrogen bond
Bhydrogen bonddisulfide bond
Chydrophobic interactioncovalent bond
Dpeptide bondionic bond