Question 5 Which statement about G proteins is true? G proteins contain only one important
binding site. (B) G proteins are heterotrimers made up of three different subunits. G proteins signal
an ion channel to open. (D) When a G protein binds to an activated receptor protein, ADP is
exchanged for ATP. (E) G proteins usually float free in the cytoplasm.Which molecule has a
ligand-gated ion channel receptor? Insulin Adenosine Acetylcholine Epinephrine (E)
EstrogenSignal ligands can be divided into two groups according to the location of their receptors.
Which of the following are the two classes of receptors? G protein-linked and protein kinase (B)
Cell membrane and protein kinase Cell membrane and ligand-gated ion channel (D) Ion channel
and cytoplasmic Membrane and intracellularWhich is not a way that cells carry out regulation of
their signal transduction pathways? Turnover of receptor proteins by endocytosis into lysosomes
Changing expression of receptor proteins Mutation of genes coding for receptor proteins Changing
expression of enzymes that activate or inactivate signal-transducing molecules (E) Diffusion of
signal-transducing molecules out of the cell.
Question 5 Which statement about G proteins is true G prote.pdf
1. Question 5 Which statement about G proteins is true? G proteins contain only one important
binding site. (B) G proteins are heterotrimers made up of three different subunits. G proteins signal
an ion channel to open. (D) When a G protein binds to an activated receptor protein, ADP is
exchanged for ATP. (E) G proteins usually float free in the cytoplasm.Which molecule has a
ligand-gated ion channel receptor? Insulin Adenosine Acetylcholine Epinephrine (E)
EstrogenSignal ligands can be divided into two groups according to the location of their receptors.
Which of the following are the two classes of receptors? G protein-linked and protein kinase (B)
Cell membrane and protein kinase Cell membrane and ligand-gated ion channel (D) Ion channel
and cytoplasmic Membrane and intracellularWhich is not a way that cells carry out regulation of
their signal transduction pathways? Turnover of receptor proteins by endocytosis into lysosomes
Changing expression of receptor proteins Mutation of genes coding for receptor proteins Changing
expression of enzymes that activate or inactivate signal-transducing molecules (E) Diffusion of
signal-transducing molecules out of the cell
