1. Assuming that a substance is uncharged and is transported across a membrane by carriers, the net.

1. Assuming that a substance is uncharged and is
transported across a membrane by carriers, the net flux of that substance will tend
to increase as

a) The membrane surface area decreases.

b) The magnitude of the concentration gradient
decreases.

c) The membrane potential becomes more positive.

d) The number of carriers in the membrane increases.

e) All of the above.

Q56;

1. What do active transporters and carriers have
in common?

a) They both transport molecules up electrochemical
gradients.

b) They both transport molecules down electrochemical
gradients.

c) They

1. Assuming that a substance is uncharged and is
transported across a membrane by carriers, the net flux of that substance will tend
to increase as

a) The membrane surface area decreases.

b) The magnitude of the concentration gradient
decreases.

c) The membrane potential becomes more positive.

d) The number of carriers in the membrane increases.

e) All of the above.

Q56;

1. What do active transporters and carriers have
in common?

a) They both transport molecules up electrochemical
gradients.

b) They both transport molecules down electrochemical
gradients.

c) They both transport lipid-soluble substances preferentially.

d) They both utilize ATP to transport molecules.

e) They both are specific for certain molecules.

Q57;

1. A leukocytea type of white blood cell fights
bacterial infections by sending out projections of its plasma membrane that surround
an invading bacterium. The membrane then fuses together, entrapping the bacterium
in a vesicle inside the cell. This is an example of

a) Exocytosis.

b) Transcytosis.

c) Receptor-mediated endocytosis.

d) Pinocytosis.

e) Phagocytosis.

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