All potential phopshorylation sites in a protein are phosphorylated upon protein activation. a) True
b) False

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.