A hormone binds a receptor and activates the cAMP signal transduction pathway ultimately leading to the cell response. Which of the following is NOT a likely mechanism for reversing (or shutting off) cAMP transduction?
A. The hormone dissociating from the receptor.
B. The GTP on the alpha subunit of the G protein is hydrolyzed to GDP.
C. Activate phosphodiesterase.
D. Activate adenylyl cyclase.
E. Protein phosphatases remove phosphates from proteins initially activated by protein kinase A.
D. Activate adenylyl cyclase.
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Which of the following acts to remove overtwisting and strain ahead of the replication fork during
DNA replication?
a. topoisomerase b. primase c. DNA polymerase d. helicase e. DNA ligase
Stomata close as a result of water moving into guard cells
____________________ Indicate whether the statement is true or false.
A country whose age structure diagram has a base smaller than most of the next higher levels is experiencing
A) a population explosion. B) near zero population growth. C) negative population growth. D) logistic growth. E) exponential growth.
How do Prevotella differ from Bacteroides?
A. Prevotella are sensitive to bile. B. Prevotella are anaerobic. C. Prevotella are pleomorphic bacilli. D. Prevotella are found in the intestinal, respiratory, and urinary tracts. E. Prevotella possess antiphagocytic capsules.