Mannitol salt agar (MSA) only allows the growth of halophiles (salt-loving microbes). Among the halophiles, mannitol fermenters release acid that turns the pH indicator yellow; mannitol nonfermenters leave the medium red. Onto MSA you inoculate a halophilic mannitol fermenter, a nonhalophilic mannitol fermenter, and a halophilic mannitol nonfermenter. Thus, the medium is acting as a ________ medium.
A. differential
B. selective and differential
C. selective
D. neither selective nor differential
Answer: B
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a. mitotic cell division b. binary fission c. meiotic cell division d. gamete production e. budding
Before examining a fungal cell under a microscope, you are told that it is a dikaryotic cell. Given that,
you should expect the cell to have
a. two complete sets of chromosomes. b. two nuclei. c. two hyphae. d. two complete sets of chromosomes and two nuclei. e. two nuclei and two hyphae.
The protein that carries oxygen in the red blood cells is
A. myoglobin. B. hemoglobin. C. actin. D. iron. E. insulin.
The growth of bacterial cultures is best described as
A) arithmetic growth. B) lag growth. C) logarithmic growth. D) cell division. E) replication.