10 12 14 2011-2017 Sapling Learning Inc. Quaration 12 20 Sapling Learning Which
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10 12 14 2011-2017 Sapling Learning Inc. Quaration 12 20 Sapling Learning Which statement below best explains why fermentulion in mammals? O Hproduaes an acid that maintains blood pH within a narrow range. O It enables mammals lo generate additional ATP in an axygenrkh.mvirorvment. o When oxygen oonoentrason in low, it replorishes NAD needed during glyoolysis. O generates ethanol, whd oan be used as an allemative source ofenergy. O It breaks down lactic acid to generate a small amount of ATP under anaerobic oondrions O Previous Give Up is view solution 0 Check Answer oNet 4Eda Hint about us careers l partners privacy policy terms of use contact us helpExplanation / Answer
Fermentation is an anaerobic process that occurs at cell level which converts organic food to chemical energy (ATP) & simpler compounds.
In fermentation process, carbohydrates are used for electron acceptor in place of Oxygen but the amount of energy produced (ATP) is little less as compared to cellular respiration, which uses the molecular oxygen. When we have oxygen riched environment, then fermentation doesn't happen. When oxygen is sufficient mammal cells, perform cellular respiration. In cases, when oxygen is minimal then energy is produced using fermentation process; for example during intensive excercise. Fermentation turns NADH and pyruvate produced in glycolysis into NAD+ and an organic molecule.
Thus "When O2 concentration is low, it replenishes NAD+ needed during glycosis." is the right choice of answer.
The first step of glycosis is as
C6H12O6 + 2 NAD+ + 2 ADP + 2 Pi 2 CH3COCO2 + 2 NADH + 2 ATP + 2 H2O + 2H+
Pyruvate is CH3COCO2 , Pi is inorganic phosphate. Two ADP molecules and two Pi are converted to two ATP (energy source) and two water molecules via substrate-level phosphorylation. Two molecules of NAD+ are also reduced to NADH.
Thus this answer looks most appropiate to explain the fermentation process.
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