Answer:
B) cAMP
Explanation:
Phosphodiesterase is an enzyme that breaks a phosphodiester bond, for example in molecules such as cAMP and cGMP. So, phosphodiestarases are are regulators of signal transduction: regulate the duration of signaling pathway.
Caffeine is central-nervous-system stimulant and the mechanisms of its action usually are: mobilization of intracellular calcium or inhibition of specific phosphodiesterases.
The Milky Way is a spiral galaxy
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Answer:
B. binding of glucose causes a conformational change so that the transporter is never open on both sides of the membrane
The answer is C. A variety of antibiotics
