Figure 37.3 -Figure 37.3 Is a Northern Blot Showing the Expression of Expression

question 31

Multiple Choice

Figure 37.3
-Figure 37.3 is a Northern blot showing the expression of Myb mRNA in cultured aleurone layer cells that were treated with gibberellin versus control cells that were not treated with gibberellin. Only the gibberellin- treated cells expressed the Myb mRNA, but the Myb mRNA was not detectable until 6- 12 hours after gibberellin application. Why did it take so long?

• A) Gibberellin had to enter the cells and find the Myb gene among the large plant genome.
• B) Gibberellin had to bind to a receptor and initiate a signal transduction cascade that, in turn, had to activate a transcription factor that triggered the transcription of the Myb gene.
• C) Gibberellin had to diffuse into the aleurone layer cells and be metabolized in order to trigger activation of a transcription factor that triggered transcription of the Myb gene.

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