Arteries are distinguished from veins based on all of the following features except the
A) direction of blood flow relative to the heart.
B) structure of their walls.
C) amount of oxygen present in the blood.
D) blood pressure pushing against the walls of the vessels.
Answer: C
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The fewer muscle fibers present in a motor unit:
A. the weaker the contractions of muscle fibers in that motor unit. B. the greater the control over the movement(s) that result from stimulation of that motor unit. C. the less likely an action potential will be generated in the muscle fibers of that motor unit. D. the less likely these muscle fibers will fatigue.
The community effect of oil pollution is
a. increased biomass. b. reduced diversity. c. longer food chains. d. increased trophic complexity. e. greater stability.
Telomerase is an enzyme that adds telomere repeats to the ends of ____________________. Fill in the blank(s) with the appropriate word(s)
Parasitism is an association between two organisms in which
a) they require each other for survival b) one organism hunts and ingests the other c) they live in close association, but neither is harmed nor helped by the association d) one benefits while the other is harmed