Question

Membrane proteins, like membrane lipids, can move laterally by exchanging positions with other membrane components. which type of membrane proteins is expected to be the least mobile, based on their function?

Answer 1

There are choices for this question namely:

a. channels
b. anchors
c. receptors
d. enzymes

The correct answer is "anchors". Lipid-anchored proteins (i.e. glycosylphosphatidylinositol-linked proteins or GPI-linked proteins) are proteins that are anchored to lipids to limit the movement of the cell; therefore these proteins are the least mobile of all the proteins in the choices. Channels, receptors, and enzymes are not anchored in any way to other molecules.