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Questions and Answers
What happens when a messenger binds to a receptor directly?
What happens when a messenger binds to a receptor directly?
- Modifies the receptor
- Causes the cellular response to the messenger (correct)
- Inhibits the cellular response
- Leads to production of a second messenger
How does messenger binding to a receptor resemble substrate binding to an enzyme?
How does messenger binding to a receptor resemble substrate binding to an enzyme?
- Both involve conformational changes in proteins (correct)
- Both involve inhibition by antagonists
- Both cause production of a second messenger
- Both lead to negative responses in tissues
What determines the response of a cell to a messenger?
What determines the response of a cell to a messenger?
- The type of receptor
- The type of messenger
- The number of receptors occupied (correct)
- The tissue in which the receptor is located
Why can very low concentrations of messengers give a massive response in cells?
Why can very low concentrations of messengers give a massive response in cells?
What is released from the adrenal glands during stress?
What is released from the adrenal glands during stress?
Which reaction occurs as a result of the L-R contact interaction?
Which reaction occurs as a result of the L-R contact interaction?
What is the role of G-protein in cell signaling?
What is the role of G-protein in cell signaling?
Which ligand is bound in the ligand position of rhodopsin for vision?
Which ligand is bound in the ligand position of rhodopsin for vision?
What is the role of IP3 in signal transduction?
What is the role of IP3 in signal transduction?
Which protein does diacylglycerol (DG) activate in signal transduction?
Which protein does diacylglycerol (DG) activate in signal transduction?
How is an external message transferred into the cell interior in signal transduction?
How is an external message transferred into the cell interior in signal transduction?
What type of channels are involved in store-gated channels, according to the text?
What type of channels are involved in store-gated channels, according to the text?
What is the role of cholinesterase activity of the receptor?
What is the role of cholinesterase activity of the receptor?
What happens when acetylcholine binds to the receptor on the cell membrane?
What happens when acetylcholine binds to the receptor on the cell membrane?
What is the function of cyclic AMP (cAMP) as a second messenger?
What is the function of cyclic AMP (cAMP) as a second messenger?
What controls the adenyl cyclase enzyme in the amplification system?
What controls the adenyl cyclase enzyme in the amplification system?
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