CELL RESPIRATION
THE KREBS CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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False
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True
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Detailed explanation-1: -When oxygen is not present, pyruvate will undergo a process called fermentation. In the process of fermentation the NADH + H+ from glycolysis will be recycled back to NAD+ so that glycolysis can continue. In the process of glycolysis, NAD+ is reduced to form NADH + H+.
Detailed explanation-2: -When oxygen is not present, glycolysis is followed by a different pathway. The combined process of this pathway and glycolysis is called fermentation. Fermentation releases energy from food molecules by producing ATP in the absence of oxygen.
Detailed explanation-3: -3. In the presence of oxygen, how is the pyruvic acid produced in glycolysis used? It passes to the second stage of cellular respiration, the Krebs cycle.
Detailed explanation-4: -No; enters by the formation of acetyl coenzyme A.