Organisms have a tendency to develop resistance to beta-lactams, and humans can develop allergic reactions to them. A drug that also targets the cell wall and can be used as an alternative is ________.
A. fluoroquinolone
B. vancomycin
C. streptomycin
D. tetracycline
E. chloramphenicol
Answer: B
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Using the data in the figure above, how long does it take for virus B to go through one lytic cycle?
A) 15 minutes B) 30 minutes C) 45 minutes D) 60 minutes
At the end of metaphase I, separate
a. homologous chromosomes b. haploid chromatids c. sister chromatids d. centrioles e. germ cells
During the day, the leaves of bean plants are ____, and at night they are ____
a. horizontal; wilted b. horizontal; vertical c. horizontal; horizontal d. vertical; vertical e. vertical; horizontal
Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell. The presence of these organelles tells you that the environment
A) is isotonic to the protozoan. B) is hypotonic to the protozoan. C) contains a higher concentration of solutes than the protozoan. D) is hypertonic to the protozoan.