Which observation suggested to Sutherland the involvement of a second messenger in epinephrine's effect on liver cells?
A) Enzymatic activity was proportional to the amount of calcium added to a cell-free extract.
B) Receptor studies indicated that epinephrine was a ligand.
C) Glycogen breakdown was observed only when epinephrine was administered to intact cells.
D) Glycogen breakdown was observed when epinephrine and glycogen phosphorylase were combined.
E) Epinephrine was known to have different effects on different types of cells.
Jane Goodall pioneered the modern approach to studying primates in the wild, involving close-up obse
When the United States gets stuck over a controversial issue—usually something a divided Congress ca
Observation Vector Icon
Nerve involvement in tetanus and rabies.
Suggested Antibiotic Prophylaxis Regimens in Patients at Potential Increased Risk of Hematogenous ...
The nurse conveys attentive listening through a posture of involvement