Ammonia, urea, and uric acid
A. are all nitrogenous wastes.
B. all require large amounts of water for excretion.
C. all require about the same amount of energy to produce.
D. are all equally toxic.
E. are all produced by the kidney.
A. are all nitrogenous wastes.
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A mutation results in the loss of the finger-like cell wall ingrowths found in normal placental transfer tissues. What effect is this mutation most likely to have on the development of the embryo?
A. The embryo will develop at a slower rate because the rate of nutrient transfer from mother to embryo will be decreased. B. The embryo will develop too quickly because the rate of nutrient transfer from mother to embryo will be increased. C. The embryo will be unaffected because plant embryos are not dependent on transfer of nutrients from maternal tissues. D. The embryo will be unaffected because the cell wall ingrowths of placental transfer tissues have no effect on nutrient transfer from maternal tissues. E. The embryo will be unable to develop because necessary sugars can no longer be transported across the plasma membrane.
The production of root hairs is mostly dependent on
A. auxin production. B. position of an epidermal cell. C. width of the root. D. length of the root. E. position of the root in the soil.
In fish, blood flows in a direction opposite to the flow of water over the gills in a process known as:
a. concurrent exchange. b. countercurrent exchange. c. crosscurrent exchange. d. exhalation. e. diffusion.
Phytoestrogens are steroid-like chemicals that are derived from soy. One of their characteristics is that they are able to
A. paralyze nerve endings. B. increase the rate of prostate cancer in men. C. cause estrogen breakdown within human cells. D. cure malaria. E. bind to the human estrogen receptor.