Question

, ras-, Rat-, MEK-, MAPK. / 4. What determines the sensitivity of a cell to a signaling ligand? a. The number of receptor proteins in the plasma membrane. b. The ligand concentration. c. The Kd of the receptor for a ligand. d. All of the above e. None of the above. 5. In the "fight or flight" response, epinephrine stimulation of muscle cells: a. inactivates Glycogen Phosphorylase Kinase (GPK). b. inactivates Glycogen Synthase (GS) c, activates Phosphoprotein Phosphatase 1 (PP1). d. inhibits Adenylyl Cyclase, lowering the [cAMP e. inactivates PKA

Answer 1

4.
Option D is the correct answer.
The sensitivity of a cell to a signaling ligand is determined by the number of factors.
These include Kd of the receptor for a ligand, concentration of the ligand, and the number of receptor proteins present on the plasma membrane.

5.
Option B is the correct answer.
In the flight or fight response, epinephrine stimulation of muscle cells results in
inactivation of glycogen synthase.