The following is a simplified scheme showing the fate of glucose during aerobic and anaerobic respiration. Identify the end products that are formed at stages indicated as A, B, C and D. Identify the correct option from those given here.
Text Solution
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(Pyruvic Acid)
• Glucose undergoes glycolysis, producing pyruvic acid as an intermediate product.
(Carbon Dioxide and Water - Aerobic Respiration in Krebs Cycle)
• In the presence of oxygen, pyruvic acid enters the Krebs cycle and is completely oxidized to 
and 
.
(Lactic Acid - Anaerobic Fermentation in Bacteria)
• In bacteria and muscle cells, pyruvic acid undergoes lactic acid fermentation, producing lactic acid as the end product.
(Ethanol and Carbon Dioxide - Alcoholic Fermentation in Yeast)
• In yeast, pyruvic acid undergoes alcoholic fermentation, producing ethyl alcohol (ethanol) and 
.
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