Which of the following bacterial genera plays an important role in environmental nitrogen cycles?
A) Nitrobacter
B) Rhizobium
C) Azospirillum
D) both Nitrobacter and Rhizobium
E) Nitrobacter, Rhizobium, and Azospirillum
E
Bloom's Taxonomy: Comprehension
Section: Survey of Bacteria
Learning Outcome: 11.19, 11.20
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Which of the following scenarios describe an ecological succession?
A. The site of a volcano eruption that is going back to its pre-eruption state B. The regrowth of a forest after a fire C. An old field left abandoned that transforms back into a forest over time D. All of the above are examples of ecological succession
What occurs during the annealing stage of a PCR reaction?
A. The DNA strands separate B. The DNA polymerase copies the template DNA C. The primers bind to complementary sequences of the template DNA D. The reaction stops
All of the following pertain to virus envelopes except
A. located between the capsid and nucleic acid. B. gained as a virus leaves the nuclear membrane. C. gained as a virus leaves the host cell membrane. D. help the virus particle attach to host cells. E. contain special virus proteins.
What is the role of pyruvic acid in fermentation?
a. It becomes the final electron acceptor for the electron transport chain in the absence of oxygen. b. It takes the electrons from NADH, oxidizing it back into NAD+. c. It provides the protons to be used in the electron transport chain. d. It is the organic acid end-product of fermentation.