______________________ are proteins that assist in regulating cell-cycle progression and are often rapidly degraded at specific times in the cell cycle.

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Quizplus · Accepted Answer

Cyclins are proteins that are synthesized and degraded at specific times in the cell cycle, and they bind to cyclin-dependent kinases (CDKs) to activate their enzymatic activity and promote cell-cycle progression. The levels of cyclins are tightly regulated, and their degradation marks key checkpoints in the cell cycle.

______________________ Are Proteins That Assist in Regulating Cell-Cycle Progression and Are