Question

question 1
1 pts
which receptor type commonly binds to dna?
ligand - gated ion channel
intracellular
g protein coupled
question 2
1 pts
epinephrine binds to receptors on the cells of small blood vessels, causing them to constrict. in the presence of a toxin that blocks production of gtp, the blood vessels do not constrict. the toxin likely causes:
the g protein to stay bound to adenylyl cyclase
the g protein to not interact with adenylyl cyclase
question 3
1 pts
neurotransmitters bind to which kind of receptors? choose two.
g protein coupled
tyrosine kinase
ligand - gated ion channel
intracellular

Explanation:

• Question 1: Intracellular receptors can enter the nucleus and bind to DNA to regulate gene expression. Ligand - gated ion channels and G - protein coupled receptors are mainly involved in signal - transduction at the cell membrane and do not directly bind to DNA.
• Question 2: G - protein - coupled receptor signaling requires GTP for the activation of G - proteins. Without GTP, G - proteins cannot be activated and thus cannot interact with adenylyl cyclase to initiate the downstream signaling that leads to blood vessel constriction.
• Question 3: Neurotransmitters can bind to G - protein - coupled receptors and ligand - gated ion channels. Tyrosine kinase receptors are mainly involved in growth factor signaling, and intracellular receptors are not the main targets for neurotransmitters as neurotransmitters typically act at the cell membrane.

Answer:

Question 1: intracellular
Question 2: The G protein to not interact with adenylyl cyclase
Question 3: G protein coupled, ligand - gated ion channel