The major difference between the smooth and rough ER is that ____
a. smooth ER is isolated to the nucleus
b. vesicles are found only in the smooth ER
c. rough ER contains ribosomes
d. smooth ER is the site of polypeptide synthesis
e. rough ER is the site of lipid synthesis
ANSWER: c
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Which of the following animals has a coelom?
a. flatworm b. earthworm c. human d. earthworms and flatworms e. humans and earthworms
A deterioration in the myelin sheaths of motor axons to the lower leg would be expected to
a. remove the restraints to ion movement and speed up impulse transmission. b. cause immobility of the leg due to cessation of impulses to leg muscles. c. slow the rate of transmission and cause lack of motor control. d. have little effect because the sheaths are for insulation only. e. cause paralysis.
A ________ is an example of a phagocyte that is part of _______ immunity.
A. macrophages/adaptive B. macrophages/innate C. helper T cell/adaptive D. helper T cell/innate
The heart of amphibians has ____ chambers. The hearts of birds and mammals have ____ chambers
a. two; three b. three; four c. two; four d. three; five e. three; two