In the 1950s, Earl Sutherland and colleagues discovered that epinephrine ____
a. triggers the release of a second messenger which leads to the hydrolysis of glycogen to glucose
b. triggers the release of a second messenger which lowers blood glucose by causing it to bind to liver cells
c. interacts directly with the enzyme glycogen phosphorylase
d. interacts directly with the cell membrane to help transport glucose into the cell
e. is a signaling molecule that does not require a cell surface receptor
ANSWER: a
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