Following its initial activation, how does a G protein become inactivated?
A. The G-protein, a subunit, is digested and recycled.
B. It spontaneously loses activity within a few seconds.
C. The G-protein, a subunit containing a GTP, eventually reassociates with the G-protein bg dimer.
D. The G-protein, a subunit GTP, is hydrolyzed to GDP allowing reassociation of the G-protein a subunit and ?? dimer.
E. The receptor becomes internalized.
D. The G-protein, a subunit GTP, is hydrolyzed to GDP allowing reassociation of the G-protein a subunit and ?? dimer.
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Which of the following is true of carbon fixation?
1.It takes place in the thylakoid membrane. 2.The carbon that is incorporated into glucose in this reaction comes from CO2. 3.Carbon fixation occurs only once in C4 plants but twice in C3 plants. 4.C4 plants use the enzyme rubisco, while C3 plants don’t use rubisco.
Which phenomenon (or lack of) will prevent significant genetic drift?
A. Gene flow is absent. B. There is mutation. C. There is genetic variation. D. The population size is large.
Which of the following statements about the prokaryotic flagella is CORRECT?
a. it's filament is made up of multiple types of proteins b. it is driven by the proton motive force c. it is made up of a single structure d. it moves with a whiplike motion
Which of the following statements about enzymes is false?
A) They increase the rate of chemical reactions. B) They function as chemical catalysts. C) They regulate virtually all chemical reactions in a cell. D) They are monomers used to build proteins.