Which of the following properties is associated with a cyclin-dependent kinase (Cdk)? A) A Cdk is inactive, or "turned off", in the presence of a cyclin. B) The number of Cdk molecules increases during the S and G₂ phases and decrease during M. C) A Cdk is an enzyme that catalyses the attachment of kinetochores to microtubules. D) A Cdk is an enzyme that attaches phosphate groups to other proteins.

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Cyclin-dependent kinases (Cdks) are a family of enzymes that attach phosphate groups to other proteins. They are activated by binding to cyclins, which are proteins that are synthesized and degraded in a cell cycle-dependent manner. Cdks play critical roles in controlling various stages of the cell cycle.

Which of the Following Properties Is Associated with a Cyclin-Dependent