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SSC Selection Post 2023 PYQ — Question 30

SSC Selection Post - Graduation Level - 27 June 2023 - Shift 4 • General Awareness • Q30

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Identify the correct statement about cell membranes.

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Correct answer: A

Explanation

The correct answer is option 1 i.e. Cell membranes are made up of carbohydrates, lipids and proteins.

Cell membranes, also known as plasma membranes, are primarily composed of lipids (mainly phospholipids), proteins, and carbohydrates. This combination allows the membrane to be semi-permeable, controlling the movement of substances in and out of the cell.

  • Lipids provide the basic structure (phospholipid bilayer), giving the membrane its fluid nature.

  • Proteins are embedded in the membrane and play roles in transport, signaling, and structural support.

  • Carbohydrates are attached to proteins and lipids on the external surface of the membrane, aiding in cell recognition and communication.

Options Explained:

  • Fats and fibre only – Fibre isn’t a component of cell membranes.

  • Lipids only – Lipids form the base, but proteins and carbohydrates are essential functional components.

  • Roughage – Refers to dietary fibre, unrelated to cell membranes.