Which of the following nutrients has a cycle that does not contain an appreciable atmospheric phase?
A) carbon
B) nitrogen
C) phosphorus
D) sulfur
C
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Natural killer cells are capable of ____
a. stimulating T cell memory b. killing bacteria in the interstitial fluid c. destroying body cells lacking MHC markers d. shutting down adaptive immune responses e. destroying parasites in the bloodstream
The plant hormone that coordinates the effects of other plant hormones during development of shoots and roots is
____.
a. auxin b. gibberellin c. cytokinin d. abscisic acid e. ethylene
After which meiotic stage (meiosis I or II) would one expect monads to be formed?
What will be an ideal response?
A notochord is
A. a strip of cartilage that forms a back and tail in all vertebrates. B. a stiff dorsal supporting rod that is replaced by the vertebral column during development. C. a stiff ventral supporting rod. D. replaced by the nerve cord during development. E. All of the choices are correct.