Sex differences in body growth are mediated by changes in growth hormone, insulin-like growth factor I and
A. thyroid hormone.
B. estradiol and testosterone.
C. prolactin.
D. progesterone.
E. cortisol.
B. estradiol and testosterone.
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The middle layer of membranes surrounding the brain and spinal column is the:
a. dura mater. b. meninges. c. arachnoid. d. pia mater.
The North American bison was hunted to near extinction in the 1800s, and has since recovered, but with decreased genetic diversity. This is an example of
A. gene flow. B. increased mutation rate. C. a bottleneck effect. D. natural selection. E. a founder effect.
Which of the following statements is true?
a. Mosses have xylem b. Mosses have lignin. c. Mosses have true stems. d. Mosses have rhizoids. e. Mosses have independent sporophytes
Which of the following could be used to sterilize plastic pipettes in plastic wrappers?
A. autoclaves B. incineration C. ionizing radiation D. ultraviolet radiation