The bacteria cultured from a soil sample typically represents
A. all the bacteria present in that sample.
B. a very small number of bacteria present in that sample.
C. all the metabolically active bacteria.
D. all the metabolically inactive bacteria.
B. a very small number of bacteria present in that sample.
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Certain species of Bacteria have been identified to cause obesity
Indicate whether the statement is true or false.
Class I and II MHC molecules
A. contains alpha-1 and alpha-2 domains that forms an antibody-binding pocket. B. consists of a complex of two protein chains and contains alpha-1 and alpha-2 domains that forms an antibody-binding pocket. C. consists of a complex of two protein chains. D. neither consists of a complex of two protein chains nor contains alpha-1 and alpha-2 domains that forms an antibody-binding pocket.
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11. Chemical evolution started on Earth ____. a. after the appearance of prokaryotic cells b. long before any cells emerged c. after the appearance of eukaryotic cells d. after the appearance of eukaryotic cells but before the appearance of multicellular organisms e. after the appearance of multicellular organisms
Which of the following statements regarding toxoids is FALSE?
A) They are produced against the toxin of the microorganism rather than the microorganism itself. B) They provide lifelong immunity. C) They stimulate antibody immune responses. D) They have few antigenic determinants. E) They are chemically or thermally modified.