A-LevelBiologyCell membranes and transportOct/Nov 2025Paper 2 Q47 Marks
Bacteria can be classified according to the type of cell wall they have. Gram-negative bacteria have a cell wall with an outer layer known as the outer membrane. Gram-positive bacteria do not have an outer membrane, but have a much thicker peptidoglycan layer than Gram-negative bacteria. Fig. 4.1 is a diagram of a section through the cell wall of a Gram-negative bacterium. [Figure 4.1]
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