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What are various mechanisms by which substances cross membranes?
Kathylorstar
there are many different types of mechanisms that can make thing cross cell membranes two of these are by diffusing and active transport.
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∙ 16y ago
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atp
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The protein channels (or carrier) allow substances that would not normally go through. These are larger molecules or ions.There are two kinds of transport protein:Channel Proteins which form a water-filled pore or channel in the membrane. This allows charged substances (usually ions) to diffuse across membranes. Most channels can be gated (opened or closed), allowing the cell to control the entry and exit of ions.Carrier Proteins which have a binding site for a specific solute and constantly flip between two states so that the site is alternately open to opposite sides of the membrane. The substance will bind on the side where it at a high concentration and be released where it is at a low concentration.
What must a substance pass through to enter or leave a cell?
If substances did not pass through cell membranes, then all single-celled and multicellular organisms would die.
