Question

question 49
what type of bacteria is represented in the diagram?
a facultative anaerobes
b obligate anaerobes
c microaerophiles
d obligate aerobes

Explanation:

Obligate anaerobes cannot grow in the presence of oxygen. In a test - tube culture, they will accumulate at the bottom of the tube where oxygen concentration is lowest. Facultative anaerobes can grow with or without oxygen and will be distributed throughout the tube. Microaerophiles require a small amount of oxygen and will form a band near the top but not at the very top. Obligate aerobes require oxygen and will accumulate at the top of the tube. Since the bacteria in the diagram are at the bottom of the tube, they are obligate anaerobes.

Answer:

B. Obligate anaerobes