Which of the following is an amphibian?
A. coelacanth
B. turtle
C. octopus
D. toad
E. lizard
D. toad
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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 ____ feedback control system functions when a change in the internal environment triggers the body to oppose the
change and restore the normal environmental conditions.
a. positive b. physiological c. reflex d. negative e. anatomical
The gray matter that surrounds cells 3, 4, 5 and 6 indicates the
a. primordial germ cell. b. spermatogonium. c. Leydig cell. d. Sertoli cell. e. Ballack cell.
Which organ's smooth muscles need to contract in order to reduce air movement to the mammalian respiratory surfaces?
a. those of the epiglottis b. those of the large bronchi c. those of the bronchioles d. those of the trachea