How Does a Protein Kinase Cascade Amplify an Intracellular Signal

question 162

Multiple Choice

How does a protein kinase cascade amplify an intracellular signal?

• A) It opens gap junctions, allowing the signal to spread to other cells.
• B) The activated G protein in the cascade binds and activates a second protein, amplifying the signal.
• C) Nitric oxide in the cascade opens gap junctions, allowing protein kinase molecules to move quickly from cell to cell.
• D) Second messengers in the cascade create shortcuts that create multiple cascades.
• E) Activation of the protein kinase receptors can trigger the activation of many other proteins.

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