Answer:
(b) Describe the role of phospholipid molecules in the cell surface membrane.
Phospholipids are the major component of the cell surface membrane and are responsible for its physical structure and integrity. They form a bilayer, with the two layers of phospholipids arranged in a ‘mosaic’ pattern. The hydrophobic tails of the phospholipids are embedded in the centre of the membrane and their hydrophilic heads form the inner and outer surfaces of the membrane, facing the cytoplasm and the external environment respectively. This structure enables the membrane to act as a selective barrier, allowing certain molecules and ions to cross it, while preventing others from entering or leaving the cell.
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