The streptomycetes form spores by division of the cells of the aerial mycelia in
A. two division planes consecutively.
B. multiple division planes.
C. a single division plane.
D. two division planes simultaneously.
Answer: C
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Betadine belongs to what group of chemical control agents?
A. Phenols B. Alcohols C. Halogens D. Aldehydes
Genetic variation is ultimately based upon which of the following?
A. Morphological differences B. Small variations in nucleotide sequence of the DNA C. Carbohydrate content of the cell D. Translation
Lisa and Jack Nash obtained compatible stem cells that cured their young daughter Molly's Fanconi anemia by
A) allowing Molly to undergo gene therapy on the affected cells. B) allowing Molly to undergo gene therapy on her germ cells. C) using umbilical cord stem cells from an unrelated donor. D) using umbilical cord stem cells from a younger sibling, who was conceived and selected for this purpose.
An important role of bacteria is:
a. primary producers. b. decomposers. c. nitrogen fixation. d. all of the above