Kinases and phosphatases are essential in the cell because they directly A)turn proteins "on and off" through changes in phosphorylation status. B)bind hydrophobic hormones in the cytoplasm. C)bind and release calcium ions. D)destroy IP₃,turning off that signaling pathway. E)activate and repress genes.

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Quizplus · Accepted Answer

Kinases and phosphatases regulate protein activity by adding or removing phosphate groups, respectively, which can activate or deactivate those proteins, effectively turning them "on and off." This is a fundamental mechanism for controlling various cellular processes.

Kinases and Phosphatases Are Essential in the Cell Because They