Scientists at the biotechnology company Genentech created the first recombinant DNA product for use in humans. Approved by the Food and Drug Administration in 1982, this product was ________
A) a gene chip
B) chymosin
C) insulin
D) human growth hormone
E) erythropoietin
C
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Cephalization is
(a) the division of the trunk into a scolex, neck, and body. (b) the presence of a head with sense organs. (c) sexual reproduction involving self-fertilization. (d) the ability to replace lost body parts.
Two weeks following a hiking trip in which several ticks were noticed and numerous mosquitoes were biting, a 25-year-old man notices a rash shaped like a red ring on the back of his thigh. He was not concerned because he had no other symptoms. Three months later he noticed significant pain in his elbows and his knees. What is the most likely cause of his illness?
A. Ehrlichiosis B. Rocky Mountain Spotted Fever C. West Nile encephalitis D. Lyme disease
Muscle contraction is triggered
A. by the nerve releasing a neurotransmitter, which triggers a flow of calcium that releases ATP and begins the actin filaments sliding across the myosin binding sites. B. by release of a neurotransmitter at a synapse that directly causes actin and myosin to slide. C. by the nerve releasing a neurotransmitter, which triggers a flow of calcium that attaches to actin filaments and exposes the myosin binding sites. D. when high levels of oxygen and sugar are released by the sarcolemma. E. when a surplus of ATP is released by a nerve motor unit.
Organisms implicated in microbially influenced corrosion include ALL of the following EXCEPT
a. sulfate reducers. b. ferrous-iron-oxidizing bacteria. c. ferric-iron-oxidizing bacteria. d. methanogens.