Question

Choose the correct answers from the alternatives given :
Which of these is not true of fermentation?

• A. Net gain of only two ATP
• B. Occurs in cytosol
• C. NADH donates electrons to electron transport system
• D. Begins with glucose

Answer 1

The correct option is C NADH donates electrons to electron transport system

• Fermentation is the process that takes place after the glycolysis in the cells where the anaerobic respiraton occurs due to absence or lack of oxygen.
• Pyruvic acid which is formed at the end of the glycolysis by the break down of the glucose molecule enters the fermentation reaction in the anaerobic cells.
• During fermentation reaction the pyruvic acid is converted to lactic acid and one molelcule of NADH is formed per molecule of pyruvic acid.
• This molecule of NADH will only form ATP when it will undergo oxidative phosphorylation in the electron transport chain which takes place in mitochondria, but for this process presence of oxygen is required so the organisms or the cells performing anaerobic respiration cannot perforem this process therefore the NADH formed will not donate electron to the ETS and no ATP will be formed by that.
• Therefore the answer option 'NADH donates electrons to electron transport system' is correct.