Question

yeast is a type of fungus that can survive in the absence of oxygen. which equation represents the process of cellular respiration in yeast during oxygen-deficient conditions?
○ glucose → lactic acid + water + energy
○ glucose → lactic acid + alcohol + energy
○ glucose → carbon dioxide + water + energy
○ glucose → carbon dioxide + alcohol + energy
possible points: 12.5

Explanation:

Yeast undergoes anaerobic respiration (fermentation) in oxygen - deficient conditions. The process of anaerobic respiration in yeast involves breaking down glucose. The products of this process are carbon dioxide, alcohol (ethanol), and energy.

• The first option is incorrect because lactic acid is a product of anaerobic respiration in muscle cells, not yeast, and water is not a product of yeast's anaerobic respiration.
• The second option is incorrect as yeast does not produce both lactic acid and alcohol during anaerobic respiration.
• The third option is the equation for aerobic respiration (which requires oxygen), while we are looking for the process in oxygen - deficient conditions.
• The fourth option correctly represents the anaerobic respiration (fermentation) in yeast, where glucose is converted into carbon dioxide, alcohol, and energy.

Answer:

D. glucose → carbon dioxide + alcohol + energy (assuming the options are labeled A, B, C, D in order as presented. If the original options had different labels, adjust the label accordingly with the correct equation "glucose → carbon dioxide + alcohol + energy")