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Passage of a cell through stages of cell cycle is controlled by a protein kinase that phosphorylates many different proteins at appropriate times.

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Passage of a cell through stages of cell cycle is controlled by a protein kinase that phosphorylates many different proteins at appropriate times.

(a) Cdk activating kinase

(b) Cyclin-dependent kinase

(c) Cyclins

(d) Tyrosine kinase

The question was asked at a job interview.

This intriguing question comes from Regulation of the Cell Cycle by Protein Kinases topic in chapter Biosignalling of Biochemistry

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The correct choice is (b) Cyclin-dependent kinase

Explanation: Passage of a cell through stages of cell cycle is controlled by Cdk.

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