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Q 1/10
Score 0
Which of the following best describes the role of a second messenger, such as cyclic AMP (cAMP), in a signal transduction pathway?
30
It acts as a primary ligand that binds to the G protein-coupled receptor from the extracellular environment.
It functions as a protein kinase that directly phosphorylates target enzymes in the nucleus.
It serves as a membrane-bound ion channel that allows the influx of chloride ions into the cytosol.
It relays and amplifies the signal inside the cell after the activation of a membrane receptor.
Q 2/10
Score 0
In a G protein-coupled receptor (GPCR) pathway, what occurs immediately after the signaling molecule binds to the receptor?
30
The G protein phosphorylates the receptor using a molecule of ATP.
The signal molecule enters the cytoplasm through a protein channel to activate adenylyl cyclase.
The receptor undergoes a conformational change, causing the G protein to exchange GDP for GTP.
The G protein dissociates from the membrane and enters the nucleus to act as a transcription factor.
10 questions
Q.
Which of the following best describes the role of a second messenger, such as cyclic AMP (cAMP), in a signal transduction pathway?
1
30 sec
Q.
In a G protein-coupled receptor (GPCR) pathway, what occurs immediately after the signaling molecule binds to the receptor?
2
30 sec
Q.
Which of the following describes the most likely immediate effect of a mutation that prevents a specific receptor tyrosine kinase (RTK) from undergoing dimerization?
3
30 sec
Q.
The drug Caffeine acts as an inhibitor of the enzyme phosphodiesterase, which breaks down cyclic AMP (cAMP) into AMP. Which of the following is the most likely effect of caffeine on a cell stimulated by a hormone that uses cAMP as a second messenger?
4
30 sec
Q.
Which of the following statements correctly distinguishes between the action of a steroid hormone and a peptide hormone in signal transduction?
5
30 sec
Q.
Which of the following describes the most likely effect of a mutation that eliminates the phosphatase activity in a signal transduction pathway?
6
30 sec
Q.
In a signal transduction pathway, the enzyme adenylyl cyclase is often activated by a G protein. What is the specific enzymatic reaction catalyzed by adenylyl cyclase?
7
30 sec
Q.
Vibrio cholerae, the bacterium that causes cholera, produces a toxin that prevents a G protein from hydrolyzing its bound GTP. Which of the following describes the most likely consequence of this toxin on the signaling pathway?
8
30 sec
Q.
Scaffolding proteins are large molecules to which several other relay proteins are simultaneously attached. What is the primary advantage of these proteins in a signal transduction pathway?
9
30 sec
Q.
In the insulin signaling pathway, the binding of insulin to its receptor leads to the recruitment of glucose transporter proteins (GLUT4) to the plasma membrane. Which of the following describes the most likely cellular response if a mutation prevents the activity of a protein phosphatase that acts on the insulin receptor?
