CELL STRUCTURES AND FUNCTION
CELL ORGANELLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What does it mean that a cell membrane is semi-permeable?
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It allows all substances in
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It allows some substances in
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It allows nothing in
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None of the above
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Explanation:
Detailed explanation-1: -The plasma membrane is known as semi-permeable because it regulates the movement of substances in and out of the cell. This means that the plasma membrane allows the entry of only some substances and prevents the movement of some other materials.
Detailed explanation-2: -Cell membranes serve as barriers and gatekeepers. They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot.
Detailed explanation-3: -A semipermeable membrane allows only solvent molecules to pass through while leaving behind solute molecules. Such type of diffusion of water through a semi-permeable membrane is called osmosis.
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