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• Facultative anaerobes arebacteria that can grow in both the presence or absence of oxygen.

• Yeasts are known as facultative anaerobes. Facultative anaerobes can survive in both aerobic and anaerobic conditions. The yeast based sensor consisted of a DO electrode and an immobilized omnivorous yeast.

(b) the atmosphere does not contain oxygen

• Alcoholic fermentation occurs in yeast and produces ethanol and carbon dioxide.
• In the absence of oxygen, alcoholic fermentation occurs. Alcoholic fermentation begins with the breakdown of sugars by yeasts to form pyruvate molecules, which is also known as glycolysis.

a. the temperature is close to 37掳C

Fermentation occurs in the absence of oxygen(anaerobic conditions), and in the presence of bene铿乧ial microorganisms (yeasts, molds, and bacteria) that obtain their energy through fermentation.

Hence this option is not correct.

c. sugar is provided to the cells

Fermentation occurs in the absence of oxygen(anaerobic conditions), and in the presence of bene铿乧ial microorganisms (yeasts, molds, and bacteria) that obtain their energy through fermentation.

Hence this option is not correct.

d. light is provided to the cells

Light is more toxic to actively respiring yeast cells than is light in the absence of oxygen or light in the absence of respiration. Cells that are deprived of oxygen or are respiration-deficient show fewer damaging effects from light when fermenting (rather than respiring).

Hence this option is not correct.