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Consider the following: ATP-->cyclic AMP. The enzyme that catalyzes this reaction is called adenylyl cyclase. This enzyme is inactive until which hormone binds?
1) Trypsin
2) Glucagon
3) Epinephrin
4) Thyroxin
5) Human Growth Hormone
Answer: epinephrine
I understand Trypsin is a protease and thus is a wrong asnwer, and Thyroxin is a lipid soluble hormone and thus would enter the cell.
But what about the others, Glucagon and hGH? They are both peptide hormones like Epinephrin, and would need to bind to cellular receptors on the cell, and give rise to secondary messengers like cAMP. Wouldn't they then also qualify as the answer to this question?
Please help!!
1) Trypsin
2) Glucagon
3) Epinephrin
4) Thyroxin
5) Human Growth Hormone
Answer: epinephrine
I understand Trypsin is a protease and thus is a wrong asnwer, and Thyroxin is a lipid soluble hormone and thus would enter the cell.
But what about the others, Glucagon and hGH? They are both peptide hormones like Epinephrin, and would need to bind to cellular receptors on the cell, and give rise to secondary messengers like cAMP. Wouldn't they then also qualify as the answer to this question?
Please help!!
