Endocrine and exocrine glands are derived from what type of tissue?
a. muscle
b. nerve
c. endocrine
d. epithelial
e. connective
ANSWER: d
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Studies of a soybean plant (Glycine max) and the bacterium Bradyrhizobium japonicum have shown that the tip of a
root hair curls toward the bacterium in response to ____.
a. a flavonoid released by soybean roots b. nod gene products produced by soybean roots c. nod gene products produced by the bacterium d. nitrogen fixation by the bacterium e. a flavonoid produced by the bacterium
A phenomenon in which sensations become less noticeable with prolonged exposure is called
A. gradient adaptation. B. an action potential. C. a graded potential. D. radiating adaptation. E. sensory adaptation.
If you were asked to separate the reptiles from birds on the chordate family tree, which characteristic would you use?
1.flight
2.nurse young
3.endothermic
4.teeth
The immunoglobulin class that is the only one capable of crossing the placenta is
A. IgA. B. IgE. C. IgM. D. IgG. E. IgD.