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Shown is growth of E. coli (left), Bacillus subtilis (middle bottom), and Staphylococcus aureus (right) on a casein plate. What do these results tell us?

You inoculate a nitrate broth with a culture of bacteria and incubate it at 37C for 48 hours, producing turbid growth. Upon addition of nitrate reagents A and B, the culture in your test tube turns red. This tells you ______.

You have successfully grown up a culture of bacteria on a Petri dish, and you wish to store it short term. Which of the following is the best place for you to store this Petri dish for a short amount of time, e.g., a week or two?

Enterococcus faecalis was inoculated on the right side of the plate shown, and following incubation and growth, a few drops of hydrogen peroxide was placed on the bacterial growth. The lack of bubbles tell us that E. faecalis ______.

What volume is this P200 set to dispense?

When Gram staining, what is the purpose of the safranin?

Following growth in phenol broths containing (from left to right) mannitol, sucrose, lactose, and glucose, Alcaligenes faecalis demonstrates the following results. These mean A. faecalis ______.

A TSA plate is inoculated with a sample taken from the bottom of Lake Washington. After two days of incubation, no growth is observed. Provide several reasons that might explain why no growth is observed.

Shown is a citrate slant following inoculation and growth of Enterobacter aerogenes. What does the change from green to blue tell us?  

Which of the following personality factors has been found to be associated with aggression?