Question

question 6
1 pts
phosphorylation typically involves the addition of a phosphate group to:

• a) atp.
• b) a protein or enzyme.
• c) an amino acid, typically serine or threonine.
• d) nadh.

o a
o b
o c
o d

Explanation:

Phosphorylation often occurs on proteins or enzymes. It can also happen on specific amino - acid residues like serine, threonine, and tyrosine. ATP donates the phosphate group in many phosphorylation reactions, but the phosphate is added to a protein/enzyme or amino - acid, not to ATP itself. NADH is not a common target for phosphorylation.

Answer:

B. A protein or enzyme