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Most transmembrane proteins have ___________ regions facing the intra- and extracellular fluid, and __________ regions embedded in the phospholipid bilayer.

The most abundant molecules in the plasma membrane are __________.

Which of the following does not affect the rate of diffusion?

The pH of blood plasma is approximately 7.4, which is slightly acidic.

The term _____________ refers to a membrane that allows some things to pass through it, but not others.

__________ is the process in which __________ forces water and small solutes, such as salts, through narrow clefts between capillary cells.

__________ provide motility to a sperm cell, __________ act as sensory “antennae” in many cells, and ____________ increase a cell’s surface area.

The constant appearance of new strains of influenza virus is an example of __________.

In this feedback loop, what is the receptor?

A solution that resists a change in pH when an acid or base is added to it is a(n) __________.