GCE AQA BIOL - Plasma membrane
Unit 3.1 Biology and disease
3.1.3 Substances are exchanged between organisms and their environment by passive or active transport across exchange surfaces. The structure of plasma membranes enables control of the passage of substances across exchange surfaces.Plasma membranes
In GCE AQA Biology you will be asked to know the fluid-mosaic model of the plasma membrane. In this model, the plasma membrane is composed of a flexible phospholipid bilayer, with various proteins, cholesterol, and carbohydrates of different size and shape interspersed within (hence ‘mosaic’).
Embedded in this double layer of phospholipids is a variety of other substances, such as proteins, cholesterol, glycolipids, and glycoproteins
Some special cells also have a feature known as microvilli. Microvilli are finger-like extensions ✌️of the cell-surface membrane.
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Written by Justine | Biology Specialist @ Tuttee
ReferencesToole, G., & Toole, S. (2015). Aqa biology A level. Oxford: Oxford University Press.Images from
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