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Jet001 [13]
3 years ago
8

Chromosome can be described as ​

Biology
1 answer:
Monica [59]3 years ago
5 0
...the DNA molecule that packaged into thread-like structures. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
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what are the roles of cyclins and cyclin-dependent kinases during the cell cycle? how do perturbations of the cell cycle checkpo
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To activate the kinases, cyclins connect to them. The activity of cyclin-dependent kinases changes with cyclin concentration. At the G2 phase, Cyclin and a Cdk unite to start mitosis (M phase). This mixture produces MPF (maturation-promoting factor), which encourages the cell to continue mitosis through the M phase. The cyclin is broken down at the G1 phase, and the Cdk is recycled.

<h3>What about cyclins?</h3>
  • A family of regulatory proteins known as cyclins manages how the cell cycle develops.
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  • A target protein will attach to a complex made up of a cyclin and a CDK, and the complex will phosphorylate the protein.
  • Cyclins collaborate with an enzyme family known as the cyclin-dependent kinases to control the cell cycle's activities (Cdks).
  • A Cdk that is not bound to a cyclin is inactive, but when it is, it becomes a functioning enzyme that can alter target proteins.
  • By phosphorylating and inactivating target substrates, cyclins are the regulatory subunits of holoenzyme CDK complexes that control progression through cell-cycle checkpoints.
  • Cyclin-dependent kinases (CDKs) are protein kinases that require a distinct subunit - a cyclin - that provides domains necessary for enzymatic action.
  • The cyclins associate with various CDKs to offer specificity of function at various stages during the cell cycle.
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Learn more about cyclins here:

brainly.com/question/931366

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