The answer is <span>malleability</span>
For full activation of a cyclin-CDK complex, an enzyme called CDK-activating kinase must phosphorylate an amino acid near the CDK active site.
CDK-activating kinase (CAK) actuates the cyclin-CDK complex by phosphorylation of an amino acid i.e. threonine residue 160 near the CDK active site.
CAK is a member of the CDK family and serves as a positive regulator of CDK1, CDK2, CDK4, as well as CDK6.
CDK activation needs two steps. Primarily, the cyclin should attach to the CDK and secondly, CAK should phosphorylate the cyclin-CDK complex on the threonine residue 160, that is situated in the CDK activation section.
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For the answer to the question above, the answer is simply a "Scientific Theory"
<span>it is a well-substantiated and well-presented explanation of the natural world, it is based on repeatedly confirmed through observation and experiment of the said phenomena. These are not the wild guess but reliable facts of the real world events.</span>
Except for bats, brids are the only known species that can fly.