PHYSIOLOGY
MUSCLE ENERGETICS GLYCOLYSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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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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Detailed explanation-1: -Scientists think that glycolysis evolved before the other stages of cellular respiration. This is because the other stages need oxygen, whereas glycolysis does not, and there was no oxygen in Earth’s atmosphere when life first evolved about 3.5 to 4 billion years ago.
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. However, if oxygen is not present, some organisms can undergo fermentation to continually produce ATP.
Detailed explanation-3: -In organisms that perform cellular respiration, glycolysis is the first stage of this process. However, glycolysis doesn’t require oxygen, and many anaerobic organisms-organisms that do not use oxygen-also have this pathway.
Detailed explanation-4: -NAD⁺ helps to pass energy from glucose to other pathways in the cell. Why can glycolysis supply energy to cells when oxygen is not available? Glycolysis does not require oxygen.