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1Which of the following types of broth inhibits noncoliforms?
A)Lauryl tryptose broth
B)Brilliant green bile broth
C)E. coli broth


2Coliforms are ___________ bacteria that ferment lactose, producing both acid and gas.
A)Gram-positive
B)Gram-negative


3When incubated at 45.5° C, E. coli broth is selective for E. coli.
A)True
B)False


4What are the lower and upper confidence limits of results from EC data read as "2-2-1"?
A)95% certain that the E. coli density is between 1 and 2/10 ml
B)95% certain that the E. coli density is between 7 and 89/10 ml
C)95% certain that the E. coli density is between 10 and 150/10 ml


5Which of the following tubes would you expect to have a higher MPN after subculture?
A)BGB broth tube
B)EC broth tube





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