(c) why is phosphorylation effective for regulating the activity of proteins? select all that apply.

ATP is the phosphoryl group donor

The free energy of the phosphorylation reaction is large.

Phosphorylation is known to be an effective way of regulating protein and in eukaryotic cells, about 30% pf the protein are phosphorylated. Thus, the enzyme responsible for the phosphorylation reaction is known as kinases. However, ATP is required in the process phosphorylation because it is needed as a donor.

a and c are the answeres

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms