The hormone that triggers insect metamorphosis from larva to adult is
a. ecdysone.
b. aldosterone.
c. retinoic acid.
d. epidermal growth factor (EGF).
Ans: a. ecdysone.
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The term "biotech barnyards" commonly refers
to a. the production of human products by farm animals. b. the development of new species of farm animals. c. the increase of milk, egg, and wool production. d. ultramodern methods of rearing more animals on less feed. e. creation of transgenic animals that can produce more of their natural products
What does the middle ear consist of?
A. The ear drum B. The tympanic canal C. The vestibular canal D. Three ossicle bones E. The ear canal
The Emerson enhancement effect
A) was proposed by Robert Emerson in the 1980s. B) states that there are three or four separate photoreactions. C) is a synergistic phenomenon. D) is the result of two distinct photosystems. E) both choices C and D
Tiny openings in the cuticle-covered surfaces of most land plants, called ____, control water loss and carbon dioxide
uptake for photosynthesis
a. gemmae b. tracheophytes c. sporopollenins d. stomata e. thalli