Question

Choose the correct answers from the alternatives given :
Which metabolic pathway is common to both the aerobic and anaerobic catabolism of sugar?

• A. Synthesis of acetyl CoA from pyruvic acid
• B. Glycolysis
• C. Krebs cycle
• D. Electron transport chain

Answer 1

The correct option is B Glycolysis

• First part for both type of respiration aerobic and anaerobic is glycolysis where the sugar is broken down to pyruvic acid.
• Glycolysis takes place in the cytoplasm of the cells and does not require for the presnece of any organelles.
• So both kind of organisms are able to perform glycolysis whether they perform aerobic or anaerobic reactions.
• Thus it can be said that in both kind of respiration glycolysis is a common process which provides substrate for further reactions in both kind of respiration. Pyruvic acid which converts to acetyl coA and takes part in kerb cycle while pyruvic acid converts to lactic acid or alcohol in fermentation reaction.
• Therefore the correct answer is option 'Glycolysis'.