Question

1>. Give functions of plasmalemma.
2>. Give any two difference between diffusion and osmosis.
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Answer 1

Explanation: 1] The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.

2] In biology, this is a difference between the two processes. One big difference between osmosis and diffusion is that both solvent and solute particles are free to move in diffusion, but in osmosis, only the solvent molecules (water molecules) cross the membrane.

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Answer 2

1. Functions of Plasmalemma:

(a) It protects the cell by acting as a barrier.

(b) It regulates the transport of substances in and out of the cell.

(c) It act as a receptor.

(d) It receives chemical messengers of other cell.