CELL RESPIRATION
GLYCOLYSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Justify that glycolysis evolved before oxygen was present in the atmosphere.
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Glycolysis does not require oxygen which represents that it evolved prior to free oxygen in the atmosphere.
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Glycolysis does not take place in the mitochondria and thus does not require oxygen.
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Glycolysis splits a glucose molecule into 2 pyruvate molecules which does not require oxygen.
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Glycolysis takes place in all living organisms which means it evolved prior to free oxygen in the atmosphere.
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Explanation:
Detailed explanation-1: -During the absence of oxygen (anaerobic conditions) and in the cells lacking mitochondria, anaerobic glycolysis prevails. The pyruvate is reduced to lactate as NADH is reoxidized to NAD+ by lactate dehydrogenase. This process is an important source of ATP for cells that lack mitochondria such as erythrocytes.
Detailed explanation-2: -Glycolysis, which is the first step in all types of cellular respiration is anaerobic and does not require oxygen. If oxygen is present, the pathway will continue on to the Krebs cycle and oxidative phosphorylation.
Detailed explanation-3: -Answer and Explanation: Fermentation occurs when there is no oxygen present after glycolysis.
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