The antimicrobial polymyxin
A. inhibits protein synthesis.
B. inhibits nucleic acid synthesis.
C. blocks a metabolic pathway.
D. disrupts cytoplasmic membranes.
E. inhibits cell wall synthesis.
Answer: D
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Which of the following is not true of the regulation of the arabinose operon?
A. CRP activates expression when bound to cAMP. B. AraC protein recruits RNA polymerase when bound to arabinose. C. Arabinose binds to AraC protein, decreasing its affinity for a DNA site near the promoter. D. Arabinose binding alters the conformation of the dimerization domain of the AraC protein.
Which of the following flower structures are
incorrectly paired?
a. filament-anther b. style-ovary c. receptacle-flower d. all of these are correctly paired e. none of these are correctly paired
Virulence refers to the degree of pathogenicity manifested by a microbe, not simply whether or not it causes disease.
Answer the following statement true (T) or false (F)
What is TRUE about the settlers of Easter Island?
a. The settlers traveled 2000 km across the ocean to arrive there. b. The population of the island peaked at 100,000 people. c. People were already living there when the settlers from Polynesia arrived. d. The island had been settled repeatedly over the years, but nobody stayed until the 1700s.