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Signal transduction pathways Knowledge-Based Practice

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

1 Biology practice questions on Signal transduction pathways. Questions that assess core concepts and understanding.

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  1. 1.

    During intracellular signal transduction involving a phosphorylation cascade, how is signal amplification primarily achieved?

    • A) A single ligand molecule enters the cytosol and binds directly to multiple target proteins at once.
    • B) Protein phosphatases transfer phosphate groups to downstream enzymes to activate them in rapid succession.
    • C) Activated receptors cross the nuclear membrane to simultaneously transcribe multiple messenger RNA molecules.
    • D) Each activated kinase enzyme catalytically phosphorylates multiple downstream proteins before being deactivated.

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