CELL RESPIRATION
GLYCOLYSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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To re-oxidise the NADH so there is not net loss of resources for energy generation
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To increase the efficiency of substrate level phosphorylation by capturing more energy
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To prepare the gylcolysis products for the kreb cycle (TCA cycle)
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Detailed explanation-1: -When oxygen is not present or if an organism is not able to undergo aerobic respiration, pyruvate will undergo a process called fermentation. Fermentation does not require oxygen and is therefore anaerobic. Fermentation will replenish NAD+ from the NADH + H+ produced in glycolysis.
Detailed explanation-2: -NADH has many fewer uses in the cell than ATP. It is normally converted into ATP in the mitochondrial electron transport chain if oxygen is present. If no oxygen is present, then NADH builds up and the cell can run completely out of NAD.
Detailed explanation-3: -The process of fermentation results in the reduction of pyruvate to form lactic acid and the oxidation of NADH to form NAD+. Electrons from NADH and a proton are used to reduce pyruvate into lactate.
Detailed explanation-4: -In the absence of oxygen, homolactic fermentation prevents NADH from accumulating, which would halt glycolysis and rob the cell of its energy source. Fermentation doesn’t yield any ATP molecules, but it does allow glycolysis to continue and producing a small trickle of ATPs.