Which of the following statements is correct about diffusion?

Which of the following statements is correct about diffusion?

Which of the following statements is correct about diffusion?

1. It requires an expenditure of energy by the cell.
2. It may require a transport protein.
3. It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
4. It is an active process in which molecules move from a region of lower concentration to one of higher concentration.

5. It involves movement of molecules down a concentration gradient and may require a transport protein.

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The correct answer is option 3. It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.

By following the concentration gradient, diffusion is a passive form of transport that spreads a substance or a wave in all directions without the use of energy or transport proteins.

When a small molecule’s concentration in the extracellular medium is higher than its concentration in the intracellular medium, such as O2, CO2, fatty acids, or ethanol, it can freely cross the cytoplasmic membrane.

A passive transport process is diffusion. Transport proteins are not necessary.
This movement occurs from a more concentrated area to one with lower concentration. A concentration gradient is what this is.

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