1- Open in response to a ligand
ion channels
G-protein coupled receptors
cytokine receptors
enzymatic receptors

2- Are usually kinases or work together with kinases
ion channels
G-protein coupled receptors
cytokine receptors
enzymatic receptors

3- Activate STATS
cytokine receptor I
cytokine receptor II
tumor necrosis factor
the first two are correct

4- Not true about tumor necrosis factor
has a "death" domain
signal results in cell death
signals for steroid expression
all of the above are false

5- Start of signal transduction cascade
agonist binds to receptor
receptor interacts with a protein
production of a second messenger
the first two are correct

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Answers:

1- Open in response to a ligand
Answer: ion channels

2- Are usually kinases or work together with kinases
Answer: enzymatic receptors

3- Activate STATS
Answer: cytokine receptor II

4- Not true about tumor necrosis factor
Answer: signals for steroid expression

5- Start of signal transduction cascade
Answer: agonist binds to receptor