Question

__________ is an obligate anaerobic.

• A. Saccharomyces cerevisiae
• B. Clostridium tetani
• C. Azotobacter
• D. Beijerinckia

Answer 1

The correct option is A Saccharomyces cerevisiae

In this group, growth only occurs in the absence of oxygen. Typically, the metabolic processes in these organisms have components that are extremely sensitive to oxidation or inactivation by molecular oxygen. Also, members of this group may lack important enzymes involved in the inactivation of reactive oxygen species, such as superoxide anion, hydroxyl radical, and hydrogen peroxide. Saccharomyces cerevisiae is a species of yeast. It is the microorganism behind the most common type of fermentation.

So the correct option is 'Saccharomyces cerevisiae'.