In addition to inhibiting the transpeptidation reaction in cell wall synthesis, penicillins may also destroy bacteria by
A. inhibiting protein synthesis.
B. inhibiting DNA replication.
C. stimulating proteins to form holes in the plasma membrane.
D. None of the choices are correct.
Answer: C
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In a cloning experiment, you use a vector that contains a lacZ gene as a selectable marker. If the competent cells are grown on X-Gal and IPTG, which colonies would contain chromosomal DNA?
A. The white colonies B. The blue colonies C. Half the total colonies D. None of the colonies
In Thomas Hunt Morgan's experiments, males had white eyes but females did not. What cross could you perform with his flies to obtain white-eyed females?
A. cross the F1 offspring to each other. B. cross an F1 female to a white-eyed male. C. cross an F2 female with an F1 male. D. cross an F2 female with a white-eyed male. E. crossing either the F1 or F2 females with a white-eyed male will produce some white-eyed females.
The simplest technique for isolating bacteria in growth media is referred to as the
A. pour-plate method. B. streak-plate method. C. serial dilution method. D. MPN method.
Members of the genus ________ may cause epiglottitis and middle ear infections.
A. Pasteurella B. Haemophilus C. Salmonella D. Enterobacter E. Yersina