Question

Which of the following four is involved in cell cycle control?

• A. Proteolysis of cyclins
• B. Phosphorylation of cyclins
• C. Proteolysis of cyclin dependent kinases
• D. Dephosphorylation of cyclins

Answer 1

The correct option is B Phosphorylation of cyclins

Cell cycle control is carried by cyclin-dependent kinases-Cdks (protien kinases). The raise or fall of these cyclins plays a key role in cell cycle. An increase activity of Cdks causes phosphorylation of intracellular protiens that regulate the major events of cell cycle such as DNA replication, mitosis and cytokinesis.

So the correct answer is 'Phosphorylation of cyclins'.