Ferric chloride is added to an inoculated an incubated phenylalanine slant and produces a green color. Is this positive or negative for phenylalanine deaminase?

What is observed when a microorganism does not ferment lactose in a sugar fermentation (PR) lactose broth medium, but does utilize the peptone also in the medium?

The inhibitor(s) in MacConkey ager is(are)

When performing the viable plate count procedure, the countable range is _____ to ______. 

Jenn inoculates an unknown sample on an eosin methylene blue agar plate. Following incubation, there is good growth that appears dark and has a green metallic sheen when moved around in the light. Which of the following is likely true of the sample?

An endospore stain performed on which of the following organisms would show spores?

After properly performing the Gram stain, a cell with a thick cell wall should be

Leia inoculates and incubates a nitrate broth. After incubation she adds nitrate I and nitrate II and notices no color change to red. She notes this is a negative result and puts away the test. Is this a correct interpretation?

__________ is a solidifying agent derived from seaweed used to make solid growth medium.

After performing the viable plate count, 50 colonies are counted on a plate with a final dilution of 1:1,000. Calculate the CFUs/mL.