Question

The rate of facilitated diffusion of a molecule across a membrane will increase as the concentration gradient of the molecule across the membrane increases to a certain point. Eventually, an increase in the concentration of the molecule will not cause any further increase in facilitated diffusion. Thus, there is a maximal rate of facilitated diffusion. This is because:

Answer 1

Answer:

there are a limited number of carrier proteins in the membrane.

Explanation:

Answer 2

There is a maximal rate of facilitated diffusion because there are a limited number of carrier proteins in the membrane.

• Diffusion refers to the movement of molecules across a semipermeable membrane from a region of high concentration to a region of low concentration.

• Facilitated diffusion is mediated by specific membrane transport proteins that carry molecules across the membrane (e.g., aquaporins that transport water molecules).

• The rate of facilitated diffusion depends on the amount of these transporter membrane proteins.

In conclusion, there is a maximal rate of facilitated diffusion because there are a limited number of carrier proteins in the membrane.

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