Which biomolecule forms a fundamental structural part of the cell’s plasma membrane?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Phospholipids.
Phospholipids are the essential structural biomolecules that form the basic framework of the plasma membrane. They arrange themselves into a bilayer, with hydrophilic heads facing outward and hydrophobic tails inward, creating a semi-permeable barrier. This unique structure allows the cell to maintain internal stability while controlling the movement of substances. Phospholipids also provide fluidity, enabling membrane proteins to move and perform vital functions like transport and signaling.
The other options are incorrect:
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Glycogen is an energy-storage polysaccharide found mainly in the liver and muscles.
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Cellulose forms the cell wall of plants, not animal cell membranes.
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Hemoglobin is an oxygen-transport protein in red blood cells and has no structural role in membranes.