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Biochemistry · Hormones
Sample itemWhich hormone signals through a receptor tyrosine kinase?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
A. Insulin
Insulin binds a cell-surface receptor tyrosine kinase, triggering phosphorylation cascades that alter glucose, lipid, and protein metabolism.
Option by option
A. Insulin (correct)
Correct: insulin receptor has intrinsic tyrosine kinase activity.
B. Cortisol
Cortisol uses intracellular receptor.
C. Aldosterone
Aldosterone uses intracellular mineralocorticoid receptor.
D. Thyroxine
Thyroxine uses nuclear receptor.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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