Bacteria which grow on the Mannitol Salt Agar and DO NOT ferment the substrate will utilize the peptone in the medium which will result in a (an)
A. increase in the pH of the medium
B. reduction of the pH indicator
C. oxidation of the pH indicator
D. decrease in the pH of the medium
E. no change in the color of the indicator
Ans: A. increase in the pH of the medium
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Organisms that grow very slowly, are non-curable, are present in very small numbers, or are mixed with a number of other bacteria may still be identified using
A. Southern blotting. B. replica plating. C. PCR. D. gas chromatography of fatty acids.
With the cladistic method, biologists construct phylogenetic trees and classifications by grouping together only those
species that share ancestral character states.
a. True b. False
If the mother's genotype is aa, all of her eggs will be identical for this trait.
Answer the following statement true (T) or false (F)
Cell-mediated immunity is directed by:
a. B cells, which secrete antibodies. b. T cells, which secrete antibodies. c. macrophages, which produce histamines. d. B cells, which react with antigen-MHC complexes. e. T cells, which react with antigen-MHC complexes.