Question 12
The most important function of cell membrane is that it:

(a) controls the entry and exit of materials from cells.
(b) controls only the entry of materials into cells.
(c) controls only the exit of materials from cells.
(d) allows entry and exit of materials without any control.

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Solution

(a) controls the entry and exit of materials from cells.

The most important function of the cell membrane is that it controls the entry and exit of materials from cells. Hence it is also called semipermeable membrane.

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