An ant species that can live only on acacia trees is an example of ____
a. an obligatory mutualism
b. parasitism
c. an ectoparasite
d. an endoparasite
e. character displacement
ANSWER: a
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True or False: Mycorrhizal associations are beneficial to the plant at a very minimal cost in carbohydrates
A. true B. false
Interpretation of biochemical tests requires that the microbiologist:
a. correlate the biochemical results with the suspect organism identification. b. correlate the biochemical results with the preliminary direct smear and staining characteristics. c. utilize quality control organisms during interpretation to insure proper functioning of the test protocol. d. all of the above are required.
Prokaryotes differ from eukaryotes in that they
a. have flagella. b. lack DNA. c. have chloroplasts and mitochondria. d. lack a nuclear envelope. e. have cell walls.
Gram-positive cultures older than 24 hours may stain Gram negative due to changes in the peptidoglycan layer.
A) True B) False