All of the following are true of the plasma membrane, except

A) it is mainly composed of a phospholipid bilayer.
B) it is selectively permeable to various substances, controlling which substances can cross the membrane.
C) the glycocalyx provides structural integrity to the plasma membrane.
D) transmembrane proteins may function as ion channels, enzymes, or receptors.
E) charged or large molecules can sometimes enter a cell via membrane proteins.

Amino acids and monosaccharides are absorbed in the ________, and fatty acids are absorbed in the ________.

A) small intestine; large intestine
B) small intestine; liver
C) stomach; small intestine
D) stomach; large intestine
E) small intestine; small intestine

The pulmonary semilunar valve prevents blood from reentering the

A) right atrium.
B) left atrium.
C) right ventricle.
D) left ventricle.
E) pulmonary trunk.

When repolarization of the plasma membrane is complete, the

A) cell dies.
B) cell regenerates.
C) cell no longer has a potential difference across its membrane.
D) cell is no longer responsive.
E) original polarity of the cell is restored.

The relationship between reef-building coral animals and zooxanthellae is classified as:

A) mutualism.
B) commensalism.
C) Batesian mimicry.
D) parasitism.
E) character displacement.

Oshkosh Corporation is a large manufacturer of military vehicles used in Afghanistan. If Oshkosh Corporation workers went out on strike and the President believed that this strike presented a significant threat to the nation's safety, he could do all of the following except:

A) Discharge the strikers and replace them with new workers
B) Appoint a board of inquiry to investigate the labor dispute
C) Seek a court-ordered injunction preventing the strike
D) Impose a "cooling off" period to allow the parties time to reach a settlement