How did some strains of Staphylococcus aureus become resistant to antibiotic drugs?
a. Patients did not take the drug as it was prescribed.
b. Bacteria mutated in response to the drug.
c. None of the listed responses are correct.
d. Some members of the bacteria population must have had genes that made them resistant to antibiotics, and these genes became more prevalent in subsequent generations.
e. The drug did not work in the way that the developers intended.
Answer: d. Some members of the bacteria population must have had genes that made them resistant to antibiotics, and these genes became more prevalent in subsequent generations.
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Copy number variants
A) are extremely rare, occurring in only about a dozen sites in the genome. B) are found only in even-numbered chromosomes. C) number in hundreds to thousands. D) are five or fewer bases long.
A rise in oxygen in Earth's air and seas put organisms that engaged in _____ at a selective advantage
a. fermentation b. photosynthesis c. sexual reproduction d. aerobic respiration e. anaerobic respiration
How many codons are in the mRNA sequence GGAAUGAAACAGGAACCC?
A. 0 because mRNA has only anticodons B. 6 C. 27 D. 9 E. 3
A nonliving acellular structure that contains DNA is a
A. nucleus. B. virus. C. protein. D. cell wall.