The hormone whose action leads to receptor autophosphorylation and activation of tyrosine kinase is:
A) GH.
B) PRL.
C) insulin.
D) estrogen.

Question

Quizplus · Accepted Answer

The hormone insulin binds to its receptor on the surface of target cells and triggers autophosphorylation and activation of the receptor's tyrosine kinase activity. This leads to a downstream signaling cascade that ultimately leads to cellular responses such as glucose uptake and protein synthesis. GH and PRL bind to their respective receptors and activate the JAK-STAT signaling pathway, while estrogen binds to nuclear receptors and modulates gene transcription.

The Hormone Whose Action Leads to Receptor Autophosphorylation and Activation