Biology

The correct answer is: B.Activation of receptor proteins on the cell membrane.

Explanation:

When receptor proteins on the cell membrane are activated, typically by signaling molecules (like hormones, growth factors, or neurotransmitters), they trigger intracellular signaling pathways that can lead to the activation of specific genes. These pathways often involve transcription factors that enter the nucleus and initiate the transcription of target genes.

Why the other options are incorrect:

A.Inhibition of transcription factors: ...