February/March 2026 Paper 22

2026 · 6 questions · 26 parts · 60 marks

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6Cell MembranesEasy3 marks
A cell surface membrane consists of many different molecular components. The passage outlines the arrangement of some of the molecular components in a cell surface membrane. Complete the passage by using the most appropriate scientific terms.
Some proteins in a cell surface membrane are located on one side of the membrane. Other proteins span the entire width of the membrane. Some of these are transport proteins and include
proteins that are needed for facilitated diffusion. The fluidity of the membrane is regulated by the molecule
, which interacts with the fatty acid tails of phospholipids. Interactions between this molecule and fatty acid tails are known as
interactions.