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If no oxygen is available, yeast will switch over to a process called anaerobic respiration - in this process, glucose (sugar) is fermented to produce energy, carbon dioxide, and ethanol. ... The thing about respiration is that the yeast cells only do it for the sake of producing energy

The conditions through which yeast cells obtain energy under a anaerobic conditions through the process called fermentation.

Yeast cells are unicellular fungal organisms.

They are known to be different from other fungi because they reproduce through the process of budding.

For these yeast cells to be able to function properly energy is needed for their metabolism and reproductive.

Fermentation is the anaerobic (absence of oxygen) break down of glucose molecules with formation of pyruvate.

The pyruvate generated is converted to Adenosine triphosphate (ATP) which is the form of energy used by these yeast cells.

Therefore, yeast cells obtain energy under anaerobic conditions through the process of fermentation.

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