Question

Amino acids that can be phosphorylated by kinases involved in regulating the cell cycle include:

a. tyrosine
b. serine
c. threonine
d. all of the above
e. none of the above

Answer 1

The amino acids capable of being phosphorylated by kinases in cell cycle regulation are tyrosine, serine, and threonine, all of which have hydroxyl groups that allow this modification.

Step-by-step explanation:

The amino acids that can be phosphorylated by kinases involved in regulating the cell cycle include: tyrosine, serine, and threonine. These amino acids can be phosphorylated due to the presence of a hydroxyl (-OH) group in their side chains, which is a target for the addition of a phosphate group by kinases, such as cyclin-dependent kinases (CDKs). CDKs are responsible for advancing the cell to the next phase by altering the shape and function of proteins through phosphorylation when they are bound to cyclins.