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Signal Transduction

AP Biology· difficulty 2/5

Kinase 1 (P) → ATP→ADP Kinase 2 (P) Kinase 3 (P) target protein P Each kinase activates many of the next → amplification

The arrangement shown is most often called a:

  • A

    Linear pathway with no amplification

  • B

    Phosphorylation cascade that amplifies the signal

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  • C

    Positive feedback loop only

  • D

    Negative feedback loop

Explanation

Each activated kinase phosphorylates many downstream kinases, multiplying the signal at each step and producing strong amplification.

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