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Paper 1 AQA A level Biology 2023 with complete solution
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13

February 2023

2022/2023

A+
Explain why plasma membranes are said to have a fluid mosaic structure. 1. Fluid because the phospholipids are constantly moving. 2. Mosaic because the proteins are scattered throughout the membrane-like tiles in a mosaic. What effect does cholesterol have on the cell membrane? 1.Cholesterol molecules fit between the phospholipids and bind to the hydrophobic tails of the phospholipids. 2.Causes them to pack together more closely, restricting the movement of other molecules in the membra...
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