The GTP on the G protein that is linked to adenylyl cyclase is split to GDP and Pi
a. in the inactive state.
b. in the process of subunit separation.
c. upon activation by the receptor.
d. by the active ? subunit.
Answer: a. in the inactive state
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Which of the following DNA regions is recognized by RNA polymerase during transcription?
A) promoter B) operator C) attenuator D) leader E) structural gene
Which of the following examples describes a unique functional property of the carboxyl group?
A. Its compounds may be structural isomers with different properties. B. Two groups can interact to help stabilize protein structure. C. It is polar as a result of the electronegative oxygen atom drawing electrons toward itself. D. The covalent bond between oxygen and hydrogen is so polar that hydrogen ions tend to dissociate reversibly. E. It acts as a base.
How many times must the centrosomes replicate in order for meiosis to occur?
A. once B. twice C. four times D. Centrosomes do not replicate.
Genes that are not required for survival, but are likely to be beneficial to the organism, are called _________
A. essential genes B. lethal alleles C. semilethal alleles D. nonessential genes E. conditional lethal alleles