Download How Do Molecules Cross the Plasma Membrane? 1. Indicate the

How Do Molecules Cross the Plasma Membrane?
1. Indicate the types of molecules that can diffuse through the lipid bilayer of the plasma
membrane, then explain why this can occur.
2. Give an example of a molecule that enters cells by way of protein channels.
3. Indicate 4 ways in which protein channels can be regulated (gated) to control the
movement of hydrophilic molecules across the membrane.
4. Compare the processes of facilitated diffusion and active transport; indicate which
process requires energy and why.
5. Compare the processes of primary vs. secondary active transport and give an
example of each.
6. Compare a symporter protein to an antiporter and give an example of each.
7. Explain how an electrochemical gradient differs from a chemical gradient, and give a
specific example of how electrochemical gradients affect transport across the plasma
membrane.
8. Indicate the purpose of exocytosis and describe how it works.
9. Indicate the purpose of each of the following types of endocytosis:
receptor-mediated endocytosis
pinocytosis
phagocytosis
10. Define the following terms:
gated channel
carrier protein
cotransport
membrane potential