Question

The correct sequence of anaerobic respiration in yeast is

• A. Glucose $\stackrel{Cytoplasm}{\to }$Pyruvate $\stackrel{Mitochondria}{\to }$Ethanol $+$ Carbon dioxide
• B. Glucose $\stackrel{Cytoplasm}{\to }$Pyruvate $\stackrel{Cytoplasm}{\to }$Lactic Acid
• C. Glucose $\stackrel{Cytoplasm}{\to }$Pyruvate$\stackrel{Mitochondria}{\to }$Lactic Acid
• D. Glucose $\stackrel{Cytoplasm}{\to }$Pyruvate $\stackrel{Cytoplasm}{\to }$Ethanol $+$ Carbon dioxide

Answer 1

The correct option is D

Glucose $\stackrel{Cytoplasm}{\to }$Pyruvate $\stackrel{Cytoplasm}{\to }$Ethanol $+$ Carbon dioxide

The correct option is D.

Explanation for the correct option:

1. Anaerobic respiration is a process that takes place primarily without oxygen and releases less energy than aerobic respiration but occurs more quickly.
2. In microorganisms, anaerobic respiration is called fermentation.

Anaerobic respiration in yeast:

1. When yeast cells regenerate rapidly during the production of beer or wine, oxygen is used.
2. Anaerobic resuscitation should be continued to ensure yeast persists.

Correct sequence of anaerobic respiration in yeast:

1. While oxygen is mainly absent, many cells are quite capable of using glycolysis to produce ATP.
2. This can be done in two ways fermentation and anaerobic respiration.
3. Fermentation is the process by which electrons and hydrogen ions from NADH produced by glycolysis are donated to other organic molecules.
4. When glucose is glycolytically converted to pyruvic acid in the cytoplasm, anaerobic respiration occurs in yeast cells.
5. It is then converted to ethanol and carbon dioxide which also occurs in the cytoplasm.

Final answer: The correct sequence of anaerobic respiration in yeast is Glucose $\stackrel{Cytoplasm}{\to }$Pyruvate $\stackrel{Cytoplasm}{\to }$Ethanol $+$ Carbon dioxide.