February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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18Cell MembranesHard1 mark
The diagram represents the arrangement of some of the molecules in a cell surface membrane.
Labels P and Q identify two regions of one of the molecules, and labels R and S identify two regions of another molecule.
Cross-section of a cell surface membrane: an unlabelled row of phospholipids forms the lower half of the bilayer; in the upper half, three phospholipid molecules at the left have their circular head groups bracketed P and their wavy fatty-acid tails bracketed Q, and beside them a larger molecule bulges from the membrane, its body labelled R and three small branched structures attached to its top labelled S
Which labelled regions always contain oxygen atoms and which labelled regions always contain phosphorus atoms?
always contain oxygen atomsalways contain phosphorus atoms
AP, Q, R and SP and S
BP, Q, R and SP only
CP, R and S onlyP only
DP, R and S onlyP and S