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Which of The Following Is True About MCyclin and CDK Question

I’m working on a biology question and need an explanation to help me study.

Which of the following is TRUE?

Group of answer choices

M-cyclin and its CDK can be highly active without an activating phosphate.

Proteolysis of M-cyclin and CDK activates APC /C.

APC /C and Cdc20 function together as an E3.

Inactive APC /C binds to M-cyclin.