LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The movement of materials through (or across) the cell membrane
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The movement of molecules from an area of high concentration to a area of low concentration
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The movement of materials across the cell membrane that requires NO ENERGY from the cell.
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The ability of the cell membrane to allow some things to pass through while preventing other things from passing through
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Detailed explanation-1: -Selective permeability of the cell membrane refers to its ability to differentiate between different types of molecules, only allowing some molecules through while blocking others. Some of this selective property stems from the intrinsic diffusion rates for different molecules across a membrane.
Detailed explanation-2: -This means that not all substance would be able to gain entry or exit through the cell. The selective permeability of the plasma membrane helps the latter to carry out an important function of controlling or regulating the passing through of substances between the external environment and the cytoplasm.
Detailed explanation-3: -In cells, some molecules can move down their concentration gradients by crossing the lipid portion of the membrane directly, while others must pass through membrane proteins in a process called facilitated diffusion.