Question

Permit the free diffusion of ions and small molecules between cells

Answer 1

Answer:

Water, Carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.

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Answer 2

Answer -

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• One group of channel proteins, discussed earlier, is the porins, which permit the free passage of ions and small polar molecules through the outer membranes of bacteria (see Figure 12.8). ... Thus, specific channel proteins allow the passage of Na+, K+, Ca2+, and Cl- across the membrane

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