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Question

Choose the correct answers from the alternatives given :
Most of the ATP made during cellular respiration is generated by 


A
direct synthesis of ATP by the Krebs cycle
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B
substrate-level phosphorylation
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C
oxidative phosphorylation
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D
glycolysis
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Solution

The correct option is C oxidative phosphorylation
  • Oxidation phosphorylation is the process where the electron acceptor such as NADH and FADH release their H ions and the ions and the electrons are tranported through various complexs of electron transport system.
  • NADH gives electrons which pass through 5 complexs of the ETS and FADH pass through 4 complexs of the ETS 
  • These electron at the end of the transport system react with oxygen and form a molecule of water.
  • Where the proton which is released by the complexs of the ETS during the transport of electrons are used in formation of ATP.
  • one molecule of NADH forms 3 molecules of ATP and one molecule of FADH forms 2 molecules of ATP
  • So after one cycle of kerb 4 molecules of NADH are released and one molecule of FADH which results in formation of 12 ATP and 2 ATP respectively. Thus generating 14 ATP for each pyruvic acid.
  • Therefore the amount of the maximum generated ATP in cellular respiration is done by oxidative phosphorylation.
  • Therefore the answer option 'oxidative phosphorylation' is correct.

Biology

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