The rate at which wastes are produced by a cell partially depends on the cell's
A) ratio of surface area to volume.
B) type of membrane.
C) volume.
D) surface area.
Ans: C) volume.
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The middle layer of the skin
(a) is called the dermis. (b) is primarily connective tissue. (c) contains collagen fibers. (d) is all of the above.
You've jogged across campus and arrived at your class on time. As you walk to your seat, you notice that you are still breathing more heavily than usual
This is because you are experiencing the ____ metabolism necessary to reestablish the resting metabolic rate of your cells. Fill in the blank with the appropriate word.
The toxin of Vibrio cholerae causes severe diarrhea because it ____
a. modifies DAG and activates a cascade of protein kinases b. activates phospholipase to produce inositol triphosphate c. decreases the cytosolic concentration of Ca++ d. modifies a G protein involved in regulating salt and water secretion e. binds with adenylyl cyclase and triggers formation of cAMP
Action potentials occur when _____
a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps kick into action d. neurotransmitter is reabsorbed