February/March 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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36Amino Acids Proteins EnzymesMedium1 mark
The diagram represents part of the structure of a protein. Three atoms have been labelled X, Y and Z.
part of a protein chain drawn with two shaded residue blocks joined by a C=X, C-Z(H), C=O, N-Y backbone, with X, Y and Z labelling three atoms
Which elements are X, Y and Z?
XYZ
Acarbonhydrogenoxygen
Bhydrogenoxygennitrogen
Coxygenhydrogennitrogen
Doxygenhydrogencarbon