[Campbell Biology P.277] Figure 11.17 demonstrates that the same signaling molecule can elic... | Practice Question

Figure 11.17 demonstrates that the same signaling molecule can elicit different cellular responses. What is the fundamental reason for this specificity as explained in the accompanying text?

  • A: Each cell possesses a unique set of receptors that bind to distinct signaling molecules.
  • B: The particular proteins a cell possesses determine what signaling molecules it responds to and the nature of the response.
  • C: Different cells have varying capacities to synthesize and release secondary messengers.
  • D: The intensity of the signaling molecule determines the specific cellular outcome.

Explanation

The caption for Figure 11.17 states: 'The particular proteins a cell possesses determine what signaling molecules it responds to and the nature of the response. The four cells in these diagrams respond to the same signaling molecule red in different ways because each has a different set of proteins purple and teal .' This directly explains the basis of specificity.