Intercalated discs
A) are characteristic of smooth muscle cells.
B) contain gap junctions that allow the signal to spread quickly through cardiac muscle cells.
C) support fast-twitch fibers of skeletal muscle.
D) stimulate pacemaker cells in cardiac muscle.
E) stimulate the contraction of skeletal muscle.
B
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The force driving simple diffusion is _____, while the energy source for active transport is _____
A) the concentration gradient; ADP B) the concentration gradient; ATP C) transmembrane pumps; electron transport D) phosphorylated protein carriers; ATP
Glycogen is
(a) a polysaccharide. (b) a storage carbohydrate. (c) found in human tissues. (d) all of the above.
Which of the following is the MOST common mode of transmission of parasitic infections?
A) direct person-to-person contact B) contaminated fomites C) contaminated food or water D) contaminated needles and syringes
Enzymes that function inside a cell are ________.
A. regulated enzymes B. endoenzymes C. constitutive enzymes D. exoenzymes E. apoenzymes