Question

a cell membrane
a. will not allow water to pass through it.
b. is present only in plant cells.
c. will allow only simple sugars but not salts to pass through it.
d. is present in all living cells.
e. is present only in animal cells.

Explanation:

• Option A: Cell membranes are semi - permeable and water can pass through via osmosis or aquaporins, so A is wrong.
• Option B: Cell membranes are present in both plant and animal cells (plant cells also have a cell wall outside the membrane), so B is wrong.
• Option C: Cell membranes are selectively permeable but both simple sugars and salts (ions) can pass through under appropriate conditions (e.g., via transporters for sugars and ion channels for salts), so C is wrong.
• Option D: All living cells (prokaryotic and eukaryotic, plant, animal, fungal, bacterial etc.) have a cell membrane to separate the cell from its environment and regulate transport, so D is correct.
• Option E: Cell membranes are present in plant cells too, so E is wrong.

Answer:

D. is present in all living cells.