AP BIOLOGY

Detailed explanation-1: -Cyclins are the regulatory subunits of cyclin-dependent kinases (Cdks ), and the complexes of cyclin and Cdk play key roles in the control of cell cycle progression.

Detailed explanation-2: -Cyclins. Cyclins are among the most important core cell cycle regulators. Cyclins are a group of related proteins, and there are four basic types found in humans and most other eukaryotes: G 1start subscript, 1, end subscript cyclins, G 1start subscript, 1, end subscript/S cyclins, S cyclins, and M cyclins.

Detailed explanation-3: -Two groups of proteins, cyclins and cyclin-dependent kinases (Cdks), are responsible for promoting the cell cycle.

Detailed explanation-4: -Cell cycle progression is regulated in part by the sequential activity of various cyclins. The cyclins are regulatory subunits that bind, activate and provide substrate specificity for their catalytic partner serine-threonine kinases, collectively called cyclin-dependent kinases (Cdks) (reviewed in refs.

Detailed explanation-5: -Summary. Cyclin-dependent kinases (CDKs) are protein kinases characterized by needing a separate subunit-a cyclin-that provides domains essential for enzymatic activity. CDKs play important roles in the control of cell division and modulate transcription in response to several extra-and intracellular cues.