Question

question 5 (1 point)
peptide hormones affect target organ cells by:
a) binding to receptors in the cytoplasm
b) causing second messengers to be released when receptor binding occurs at the membrane surface
c) binding to target receptors in the nucleus
d) inhibits the dephosphorylation of atp to camp
question 6 (1 point)
second messengers are triggered by:
a) peptide hormones
b) anabolic steroids
c) steroid hormones
d) all of the above

Explanation:

Peptide hormones are water - soluble and cannot pass through the lipid - bilayer of the cell membrane. So, they bind to receptors on the cell membrane surface. This binding triggers the release of second - messengers (like cAMP) inside the cell. Steroid hormones (including anabolic steroids) are lipid - soluble and can pass through the cell membrane and bind to receptors in the cytoplasm or nucleus. Second - messengers are specifically triggered by peptide hormones as they cannot enter the cell to directly affect intracellular processes.

Answer:

Question 5: B. causing second messengers to be released when receptor binding occurs at the membrane surface
Question 6: A. peptide hormones