How is drug-resistant Neisseria gonorrhoeae treated?
A) with penicillinase-resistant ?-lactams
B) with tetracycline
C) with synthetic analogs of tetracycline
D) with vancomycin
Answer: A
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Even though there is free rotation around the glycosidic bond of nitrogenous bases, steric hindrance:
A. causes the purines to adopt only the anticonfiguration. B. causes the pyrimidines to adopt only the syn configuration. C. causes pyrimidines to adopt only the anti configuration. D. causes purines to adopt only the syn configuration. E. only affects purine bases; pyrimidines are allowed to adopt any configuration.
What pattern of inheritance includes the AB blood type, in which both A and B alleles are expressed?
A) incomplete dominance B) codominance C) independent assortment D) sex linkage
Observe Figure 25.2(a) of your lab manual. The disc in the center of the plate is saturated with a chemical being tested for mutagenic properties. As you know, this chemical has mutagenic properties because there are numerous revertant colonies on the plate. The concentration of the test chemical is highest in areas closest to the disc, and lowest in areas furthest from the disc. Why aren’t there revertant colonies in areas where the test chemical (which causes the reversions) is the greatest?
A) In high concentrations the test chemical is toxic B) In high concentrations the test chemical causes DNA repair C) In high concentration the test chemical causes spontaneous mutations
Plant roots that are in a horizontal position grow down because
A. auxins are being pulled to the upper side. B. cells on the upper side elongate more than those on the lower side. C. auxins are stimulating cells on the lower side to elongate more. D. auxins are having no influence on this process. E. statoliths are pushing auxins to the upper side.