What does the phosphorylation of Cdc25 by M-Cdk do? Choose one:
O It activates Cdc25, which in turn activates more M-Cdk.
O It inactivates Cdc25, which promotes activation of more M-Cdk.
O It inactivates Cdc25, preventing further activation of M-Cdk.
O It activates Cdc25, allowing the cell to exit mitosis.
O It activates Cdc25, which inactivates M-Cdk.

The answer is C

Explanation:

Cdc25 activates cyclin dependent kinases by removing phosphate from residues in the Cdk active site. In turn, the phosphorylation by M-Cdk (a complex of Cdk1 and cyclin B) activates Cdc25. Together with Wee1, M-Cdk activation is switch-like.

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