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Chapter 9: Q. 23 (page 252)
What is the difference between intracellular signaling and intercellular signaling?
Intracellular signaling is communication within a cell and intercellular signaling is communication between the cells.
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What would happen if the intracellular domain of a cellsurface receptor was switched with the domain from another receptor?
Why is signaling in multicellular organisms more complicated than signaling in single-celled organisms?
What property enables the residues of the amino acids serine, threonine, and tyrosine to be phosphorylated?
a. They are polar.
b. They are non-polar.
c. They contain a hydroxyl group.
d. They occur more frequently in the amino acid sequence of signaling proteins.
Endocrine signals are transmitted more slowly than paracrine signals because ___________.
a. the ligands are transported through the bloodstream and travel greater distances
b. the target and signaling cells are close together
c. the ligands are degraded rapidly
d. the ligands don't bind to carrier proteins during transport
Insulin is a hormone that regulates blood sugar by binding to its receptor, insulin receptor tyrosine kinase. How does insulin鈥檚 behavior differ from steroid hormone signaling, and what can you infer about its structure?
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