Which organism is able to live in atmospheric O2?Group of answer choicesObligate anaerobeAerotolerant anaerobeObligate aerobeMicroaerophileobligate aerobe, microaerophile and aerotolerant anaerobeNext

The term aerotolerant anaerobe refers to an organism thatGroup of answer choicesrequires more oxygen than is present in air.does not use oxygen but tolerates it.is killed by oxygen.uses oxygen or grows without oxygen.requires less oxygen than is present in air.Next

An organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is a(n) A. aerobe. B. obligate aerobe. C. facultative anaerobe. D. microaerophile. E. obligate anaerobe.

Escherichia coli and Salmonella can live in our intestines in the presence or absence of oxygen. They are consideredMultiple Choiceobligate anaerobes.phototrophs.facultative anaerobes.autotrophs.aerobic.

You inoculated a pure culture of unknown bacteria into a tube containing thioglycollate medium to study their metabolic relationship with oxygen. The culture was incubated for an appropriate length of time at the optimal growth temperature of the organism. When you examined the culture, you observed that although the organism grew throughout the medium, the growth was denser at the surface. What would you conclude about the oxygen requirements for this unknown species?ANSWERThe unknown is an obligate anaerobe.The unknown is an obligate aerobe.The unknown is a microaerophile.The unknown is a facultative anaerobe.

Organisms that prefer environments having decreased concentrations of oxygen are called