Which of the following statements is false? Active M-Cdk phosphorylates the activating phosphatase in a positive feedback loop. Mitotic Cdk must be phosphorylated by an activating kinase before it is active. Phosphorylation regulates the activity of mitotic Cdk. Phosphorylation of mitotic Cdk by the inhibitory kinase makes the Cdk inactive, even if it is phosphorylated by the activating kinase. The activating phosphatase removes all phosphates from mitotic Cdk so that M-Cdk will be active.