Kinases and phosphatases are essential in the cell because they

A) help turn proteins "on and off" through changes in phosphorylation status.
B) are enzymes that destroy damaged proteins.
C) sense short poly-A tails in mRNA as a signal to degrade the mRNA.
D) destroy second messengers, thereby turning off a signal transduction pathway.
E) all of the above


A) help turn proteins "on and off" through changes in phosphorylation status.

Biology & Microbiology

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_____ is(are) formed during the oxidation of pyruvate to acetyl CoA

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The activation of the parasympathetic branch of the autonomic nervous system is associated with _____

A) resting and digesting B) release of epinephrine into the blood C) increased metabolic rate D) intensive aerobic exercise

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Where does DNA replication occur?

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Biology & Microbiology