Question

multiple choice question

based upon the descriptions, identify the tube growing the obligate anaerobe.

tube with heavy growth toward the bottom
tube with heavy growth at surface only

Explanation:

Define oxygen requirements for obligate anaerobes

Obligate anaerobes cannot tolerate oxygen and grow only where there is no oxygen (at the bottom of a thioglycolate tube).

Analyze the growth patterns in the options

• Growth at the surface only indicates obligate aerobes.
• Growth toward the bottom indicates obligate anaerobes.

Answer:

• Tube with heavy growth toward the bottom (Correct answer)
• Tube with heavy growth at surface only