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a. a recongnition protein
b. a receptor protein
c. a channel protein
d. protein filaments the cytoplasm

2007-03-23 06:00:47 · 3 answers · asked by Anonymous in Science & Mathematics Biology

3 answers

B. a receptor protein on a cell surface. Depending on the type of hormone (protein or steroid) it may activate the 2nd messenger system by activating adenylate cyclase or guanylate cyclase.

2007-03-23 06:05:30 · answer #1 · answered by misoma5 7 · 1 0

It's b.

2007-03-23 13:09:38 · answer #2 · answered by Anonymous · 1 0

b.

2007-03-23 13:50:06 · answer #3 · answered by Petrolea 2 · 0 0

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