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The MAP kinase cascade is a series of

  • A.second messengers being degraded
  • B.kinases each phosphorylating the next
  • C.channels opening in succession
  • D.receptors moving through the membrane

Answer: B

Three kinases acting in sequence amplify the signal and provide several points at which it can be regulated. The pathway relays growth signals from the surface to the nucleus. Its name comes from mitogen-activated protein kinase.

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