Which of the following classification methods relies on the morphology of organisms?
A) phage typing
B) physical characteristics
C) biochemical tests
D) analysis of nucleic acids
E) serological tests
B
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Blood agar is an example of a(n) ________ medium
A) selective B) general-purpose C) enrichment D) differential
Transposable elements
A. are DNA sequences that can "jump" within the genome. B. are segments of RNA found in chromosomes. C. result from damage to the chromosomes by things like radiation. D. are another name for translocations. E. are formed during transcription.
The cell-mediated immune response is most
effective against
a. cancer cells. b. viral infected cells. c. bacteria circulating in the blood. d. cancer cells and viral infected cells. e. bacteria circulating in the blood and viral infected cells.
Endospores
A) are bacterial reproductive structures. B) can be produced when nutrients are scarce. C) are produced by bacteria, algae, and fungi. D) are resistant to everything except radiation. E) can last for only about 100 years.