Cyclins modulate the progression of cells through the cell cycle by
A)directly activating G proteins.
B)inducing synthesis of constitutively active forms of growth cell receptors.
C)activating protein kinases that are critical regulators of cell division.
D)degrading histones.
E)increasing the production of DNA polymerases.

Question

Quizplus · Accepted Answer

Cyclins activate protein kinases, including cyclin-dependent kinases (CDKs), that are critical regulators of cell division. CDKs phosphorylate target proteins, ultimately leading to the progression of the cell cycle.

Cyclins Modulate the Progression of Cells Through the Cell Cycle