Plasma membranes are described as selectively permeable, which means t…

Question

Plasma membranes are described as selectively permeable, which means they:

Accepted Answer

B. Let some substances pass but not others

1. A membrane that let everything through would not define a cell at all.
2. A membrane that let nothing through would starve it.
3. Plasma membranes are selectively permeable, that is semipermeable: they allow some substances to pass through, but not others.
4. Water is one of the substances that crosses, but it is not the only one.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 5 'Structure and Function of Plasma Membranes', sections 5.1-5.4_

Answer

Let every substance pass through freely

Answer

Block absolutely every substance equally

Answer

Let only water pass and nothing besides

Plasma membranes are described as selectively permeable, which means they:

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