Question

where would you expect to see growth for an obligate aerobe?

a. on a plate incubated in an anaerobic jar and also a plate placed on the incubator shelf.
b. on a plate in the anaerobic jar.
c. on a plate placed on the incubator shelf but not within the anaerobic jar.

which of the organisms would not have grown if placed in the anaerobic jar?

a. obligate anaerobes
b. facultative anaerobes
c. aerotolerant anaerobes
d. obligate aerobes

Explanation:

Analyze growth conditions for obligate aerobes

Obligate aerobes require oxygen for cellular respiration and cannot grow without it. An anaerobic jar removes oxygen, whereas an incubator shelf provides an oxygen-rich atmospheric environment. Therefore, growth occurs only on the incubator shelf.

Analyze growth in an anaerobic jar

An anaerobic jar lacks oxygen. Obligate anaerobes, facultative anaerobes, and aerotolerant anaerobes can all grow in the absence of oxygen. Obligate aerobes strictly require oxygen to produce energy and will fail to grow in this environment.

Answer:

Question 1

• A. On a plate incubated in an anaerobic jar and also a plate placed on the incubator shelf.
• B. On a plate in the anaerobic jar.
• C. On a plate placed on the incubator shelf but not within the anaerobic jar. (Correct answer)

Question 2

• A. Obligate anaerobes
• B. Facultative anaerobes
• C. Aerotolerant anaerobes
• D. Obligate aerobes (Correct answer)