Mannitol salt agar (MSA) only allows the growth of halophiles (salt-loving microbes); nonhalophiles will not grow. Among the halophiles, mannitol fermenters will produce acid that turns the pH indicator yellow; mannitol nonfermenters leave the medium red. Onto MSA you inoculate a halophilic mannitol fermenter and a halophilic mannitol nonfermenter. In this case, the medium is acting as (a) ________ medium(s).
A. enrichment
B. differential
C. selective and differential
D. selective
Answer: B
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The West African black rhino, one of four subspecies of rhinoceros, was declared extinct in 2006. Their horns were believed by many to hold medicinal value. What is the most likely reason for the extinction of the West African black rhino?
A. habitat loss B. overexploitation C. introduced species D. pollution E. climate change Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about causes of extinction? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The rate of diffusion is affected by the permeability of the membrane to the diffusing solute
a. True b. False
Most familiar types of fungi including mushrooms, puffballs, and shelf fungi are examples of
A) chytrids. B) ascomycetes. C) zygomycetes. D) basidiomycetes.
Choose the answer that fills in the blanks of this sentence in the correct order. Most protozoa have a motile, feeding stage known as a(n) _____ which, in some protozoa, alternates with a resting state known as a(n) _____.
A) Cyst; trophozoite B) Trophozoite; spore C) Trophozoite; cyst D) Spore; trophozoite