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Crosstalk between signalling pathways means that

  • A.one pathway can influence the output of another
  • B.two separate signals must always arrive together
  • C.receptors exchange places within the plasma membrane
  • D.a pathway repeats itself over and over continuously

Answer: A

Shared components let pathways modulate one another, which allows a cell to integrate several inputs into one decision. It also makes the consequences of a drug harder to predict than a single pathway would suggest. Side effects often trace back to crosstalk of this kind.

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