Which of the following antibiotics is produced by bacteria in the genus Streptomycetes?
A. Chloramphenicol
B. Tetracycline
C. Vancomycin
D. All of the choices are correct.
Answer: D
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In complex land plants, the diploid stage is resistant to adverse environmental conditions, such as dwindling water supplies and cold weather. The diploid stage progresses through which sequence?
a. gametophyte ? male and female gametes b. spores ? sporophyte c. zygote ? sporophyte d. zygote ? gametophyte e. spores ? gametophyte
Blood flows from the right ventricle to the ________.
Fill in the blank(s) with the appropriate word(s).
__________ is the science of making hypotheses about evolutionary relationships among clades.
Fill in the blank(s) with the appropriate word(s).
Nutritional mutants in Neurospora can be "cured" by treating the medium with substances in the defective metabolic pathway. What determines whether the mutant strain (auxotroph) is "cured" by a particular substance?
What will be an ideal response?