The chief constituents of biological membranes are:
A
proteins
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B
waxes
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C
triglycerides
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D
phospholipids
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Solution
The correct option is D phospholipids The chief constituents of biological membranes are phospholipids. They protect the membrane by forming a protective bilipid layer. In this bilayer, the phospholipids are arranged so that all the hydrophillic heads are pointing outward and the hydrophobic tails are pointing inward. This arrangement comes about because the areas both outside and inside your cell are mostly water, so the hydrophobic tails are forced in. Since lipids do not get broken down by water, the bilayer provides a barrier around the cell.