The host range of a virus depends on the presence of host receptor molecules
Indicate whether this statement is true or false.
TRUE
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The vacuole of the giant sulfide-oxidizing bacterium Thiomargarita namibiensis contains ________ that is used to oxidize sulfide under ________ conditions
A) nitrate / anoxic B) sulfate / anoxic C) oxygen / oxic D) sulfur / anoxic
DNA replication is said to be semiconservative because
a. the number of nucleotides within genes remains constant. b. half of the DNA in a cell comes from one parent and the other half from the other parent. c. the same process of DNA replication is used by all organisms. d. the total amount of DNA within an individual remains the same. e. each new DNA molecule is composed of one old strand and one new strand.
The term biome refers to
a. the animals present in a given area. b. the interaction of living organisms and the physical environment in a region. c. large regions with distinctive plant communities. d. all the living organisms in an area. e. only the bacteria in a region.
Amoxicillin is very effective for treating infections with Gram-positive bacteria but rarely causes side effects in humans. This is an example of
A) selective toxicity. B) narrow spectrum of action. C) a broad-spectrum antimicrobial. D) antibiotic resistance. E) altruism.