A half -life, in terms of a chemical messenger, refers to
A) how long the chemical messenger will be effective in the body.
B) the radioactivity of the chemical messenger.
C) the amount of time the messenger is bound to a protein.
D) the time it takes for half of the chemical messenger in the blood to be degraded.
E) the amount of time it takes to cross the plasma membrane.
Correct Answer:
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