Adenylyl cyclase catalyzes the reaction in which:a
a protein is phosphorylated.
b. ATP is converted to cAMP.
c. GTP is converted to GDP.
d. PIP2 is split.
e. calcium ions bind calmodulin.
B
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Which regulatory mechanism is activated when the overall energy availability of a cell is high?
A. Citrate inhibits phosphofructokinase 1. B. ADP up-regulates phosphofructokinase 1. C. ATP inhibits phosphofructokinase 1. D. AMP up-regulates phosphofructokinase 1.
The female part of a flower is known as the
a. stamen. b. anther. c. carpel. d. megaspore. e. endosperm
A bird stalks, kills, and then eats an insect. Based on its behavior, which pair of ecological terms describes the bird?
a) herbivore; decomposer b) carnivore; consumer c) autotroph; herbivore d) producer; heterotroph
Multiple sclerosis results from which of these?
The destruction of the myelin sheath that surrounds axons in the CNS The inhibition of the ion channels crossing the cell membrane The underproduction of neurotransmitters The failure of motor neurons to carry information