How many half-moon shaped, pocketlike cusps are found in each semilunar valve?
A. 3
B. 1
C. 6
D. 2
E. 4
Answer: A
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In which type of transport do solutes travel from an area of higher concentration to an area of lower concentration without the addition of energy?
A. Osmosis B. Diffusion C. Filtration D. Endocytosis
Immune deficiency disorders are acquired.
a. true b. false
What part of the brain is responsible for cognition?
A) hypothalamus B) cerebral cortex C) reticular formation D) thalamus
Suppose 1 molecule of hormone X activated 10 G proteins, each G protein activated 10 adenylate cyclase molecules, each adenylate cyclase made 1,000 cAMP molecules, and each cAMP activated 1,000 enzyme molecules. This would be a case of
a. a synergistic effect. b. hypersecretion. c. up-regulation. d. enzyme amplification. e. negative feedback inhibition.