Which of the following make(s) MacConkey agar selective?

The most important operational risk factor to microbiology lab safety is releasing microorganisms into the air as aerosols and droplets.

Nitrate reduction is responsible for __________.

Which of the following indicates a negative oxidase test?  

The peptone in the EMB agar serves as a(n) __________.

Eosin methylene blue agar is used to __________.

MacConkey agar is used to isolate and differentiate members of the Enterobacteriaceae based on the ability to ferment lactose.

Gas in the Durham tube during the nitrate reduction test is a possible indication that __________ has occurred.

Chemicals that develop color as they become oxidized are known as __________.

Is hemolysin activity of Streptococci best under aerobic or anaerobic conditions? _________________