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Cell signaling Knowledge-Based Practice

Biology · Cell Communication & the Cell Cycle · Biology · Cell Communication

1 Biology practice questions on Cell signaling. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    During a phosphorylation cascade in eukaryotic cell signaling, what is the primary role of protein phosphatases?

    • A) They transfer phosphate groups from ATP to inactive protein kinases to amplify the cascade.
    • B) They synthesize cyclic AMP from ATP to act as intracellular second messengers.
    • C) They bind extracellular signaling ligands to stimulate receptor dimerization across the plasma membrane.
    • D) They remove phosphate groups from active proteins to inactivate them and turn off the signal transduction pathway.

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