Which amino acid is NOT one that may be targeted for phosphorylation to modulate the activity of an enzyme

Alanine

Explanation:

Alanine is the answer to this question. This amino acid is used for biosynthesis of protein. It is useful for making proteins. Also it helps in the breakdown of tryptophan and also vitamin b6. It helps in strengthening the immune system and also the central nervous system. It is nonessential and can be found in foods like nuts and dairy products.

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

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