1- Soluble guanylyl cyclases
contain heme groups
have alpha-1 and beta-1 subunits
are homodimers
the first two are correct

2- Membrane bound guanylyl cyclases are activated by
atrial natriuretic peptide
Ca2+
NO
G-proteins

3- PKA phosphorylates
tyrosine residues
serine or threonine residues
phosphodiesterases
all of the above

4- cGMP depolarizes rod cells by
binding Na+ channels
increasing phosphodiesterase activity
decreasing NO levels
none of the above

5- Not a form of NOS
endothelial
epithelial
neuronal
inducible

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Answers:

1- Soluble guanylyl cyclases
Answer: the first two are correct (contain heme groups AND have alpha-1 and beta-1 subunits)

2- Membrane bound guanylyl cyclases are activated by
Answer: atrial natriuretic peptide

3- PKA phosphorylates
Answer: serine or threonine residues

4- cGMP demoralizes rod cells by
Answer: binding Na+ channels

5- Not a form of NOS
Answer: epithelial