How Does a Protein Kinase Cascade Amplify an Intracellular Signal

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.