The gritty substance you may feel on your teeth
after using toothpaste is actually
a. small deposits of sand.
b. diatomaceous earth.
c. cellulose from dinoflagellates.
d. a synthetic abrasive.
e. derived from foraminiferans.
Answer: b
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Cytokinins are plant hormones that usually affect cell
A. elongation. B. growth. C. division. D. wall expansion. E. turgor pressure.
Oxygen, carbon dioxide, as well as other small
molecules, cross the plasma membrane through the process(es) of
a. diffusion. b. osmosis. c. endocytosis and exocytosis. d. active transport. e. facilitated diffusion
In an experiment, the control group is
a. not subjected to experimental error. b. exposed to experimental treatments. c. maintained under strict laboratory conditions. d. treated exactly the same as the experimental group, except for one variable. e. statistically the most important part of the experiment.
Individuals with Lesch—Nyhan syndrome exhibit
A) urine that turns black when exposed to air. B) compulsive self-mutilation behaviors. C) lighter than normal pigmentation of skin, hair, and eyes. D) severe anemia. E) a cherry-colored spot on the retina.