[Campbell Biology P.431] Referencing Figure 18.17b, which describes "Induction by nearby cel... | Practice Question

Referencing Figure 18.17b, which describes "Induction by nearby cells," what is the correct sequence of events initiated by an inductive signal, leading to a change in gene expression in a recipient cell?

  • A: Signaling molecule release -> Signal receptor binding -> Signal transduction pathway -> Change in gene expression in nucleus.
  • B: Signal transduction pathway -> Signaling molecule release -> Signal receptor binding -> Change in gene expression.
  • C: Change in gene expression -> Signal receptor binding -> Signaling molecule release -> Signal transduction pathway.
  • D: Signaling molecule release -> Direct alteration of nuclear DNA -> Change in gene expression.

Explanation

Figure 18.17b clearly illustrates the sequence: 'Signaling molecule' is released from one cell, binds to a 'Signal receptor' on the target cell, which then activates the 'Signal-transduction pathway' that ultimately leads to effects on the 'NUCLEUS' and a 'change their gene expression.'