May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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13Proteins Amino AcidsMedium1 mark
Which statements about the structure of haemoglobin are correct?
  1. 1
    A haemoglobin molecule has a spherical structure and amino acids with hydrophilic R-groups that are found near the centre of the molecule.
  2. 2
    Hydrogen bonds that form between the –NH group of one amino acid and the – group of another amino acid stabilise the tertiary structure.
  3. 3
    The tertiary structure of a haemoglobin molecule changes when an oxygen molecule binds to the haem group.