Respiration in PlantsHard
Question
During which stage, in the complete oxidation of glucse are the greatest number of ATP mol ecules formed from ADP
Options
A.glycolysis
B.Krebs cycle
C.conversion of pyruvic acid to acetyl Co-A
D.electron transport chain
Solution
In glycolysis 2 ATP and 2 NADH2 molecules are formed. These 2 NADH2 molecules go to electron transport chain.
In oxidative decarboxylation no ATP molecule is formed but two molecules of NADH2 are formed from two molecules of pyruvate. These 2 NADH2 go to electron transport chain. In Krebs cycle 2 ATP, 6 NADH2 and 2 FADH2 molecules are formed from two molecule of acetyl Co-A. These NADH2 and 2 FADH2 go to electron transportchain all NADH2 and 2 FADH2 pass to electron carriers and 3 ATP and 3 ATP molecules per NADH2 and 2 FADH2 respectively. Thus,
2 ATP are formed in glycolysis
2 ATP in Krebs cycle and
38 ATP from electron transportchain
40 ATP
2 ATP molecules are used during glycolysis. So, the net gain of ATP molecules during one complete oxidation of a glucose molecule is 38 ATP.
In oxidative decarboxylation no ATP molecule is formed but two molecules of NADH2 are formed from two molecules of pyruvate. These 2 NADH2 go to electron transport chain. In Krebs cycle 2 ATP, 6 NADH2 and 2 FADH2 molecules are formed from two molecule of acetyl Co-A. These NADH2 and 2 FADH2 go to electron transportchain all NADH2 and 2 FADH2 pass to electron carriers and 3 ATP and 3 ATP molecules per NADH2 and 2 FADH2 respectively. Thus,
2 ATP are formed in glycolysis
2 ATP in Krebs cycle and
38 ATP from electron transportchain
40 ATP
2 ATP molecules are used during glycolysis. So, the net gain of ATP molecules during one complete oxidation of a glucose molecule is 38 ATP.
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