22) The process by which molecules such as oxygen are moved into cells along their concentration gradient directly through the cell membrane is called

A) osmosis.

B) diffusion.

C) active transport.

D) osmosis.

E) exocytosis.

23) The process that occurs when hydrostatic pressure pushes materials through a membrane is called

A) diffusion.

B) facilitated diffusion.

C) osmosis.

D) filtration.

E) active transport.

24) Immersion of red blood cells into a(n) ________ solution results in lysis of the cell.

A) isotonic

B) hypertonic

C) hypotonic

D) monotonic

E) equilibrated

25) Crenation occurs when a blood cell is placed in a(n)

A) isotonic solution.

B) pinocytotic solution.

C) hypotonic solution.

D) monotonic solution.

E) hypertonic solution.

26) Which substances can pass directly through the plasma membrane?

A) carbohydrate-bound

B) water soluble

C) lipid insoluble

D) iron soluble

E) lipid soluble

27) Which property of a membrane determines which molecules may enter or leave?

A) differentiation

B) growth

C) structural integration

D) permeability

E) cellular activation

28) Alcohol and fatty acids enter cells via

A) anchor proteins.

B) receptor proteins.

C) lipid channels.

D) diffusion.

E) endocytosis.

29) A solution that contains a higher solute concentration than the cytoplasm of a cell is called

A) monotonic.

B) hypertonic.

C) isotonic.

D) hypotonic.

E) semitonic.

30) Which of the following is an indication of the force of water movement into a solution?

A) equilibrium

B) diffusion pressure

C) hydrolysis

D) crenation pressure

E) osmotic pressure

31) The concentration of ________ determines the osmotic pressure of a solution.

A) solvent molecules

B) water molecules

C) solute molecules

D) channel proteins

E) lipid molecules