Which of the following affects the size of the clear zone in a disk diffusion test of antimicrobial susceptibility?
A. The initial concentration of the drug
B. The diffusion rate of the drug
C. The solubility of the drug
D. All of the choices are correct.
Answer: D
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Carbon primarily cycles between
a. animals and plants. b. animal wastes and rocks. c. plants and the atmosphere. d. soil and the atmosphere.
Halobacterium salinarum lives in and requires a high salt concentration. This is an example of an archaeon described as a ______.
A. halophile B. thermophile C. barophile D. psychrophile
Erica, a 17-year-old female, is a member of her high school swim team. She visits her physician because she has missed her last two menstrual periods. Laboratory tests are negative for HCG. Based on this limited information, speculate about the cause of Erica’s amenorrhea. What treatment, if any, would you recommend?
What will be an ideal response?
Bats, birds and dragonflies can all fly. Which of the following groups of animals have some members capable of flights?
A. reptiles, amphibians, and arthropods B. reptiles and mammals only C. mammals and arthropods only D. amphibians and arthropods only E. reptiles, arthropods, and mammals