BotanyHow many ATP are synthesised per sucrose molecule in aerobic respiration through substrate level phosphorylation?

How many ATP are synthesised per sucrose molecule in aerobic respiration through substrate level phosphorylation?

  1. A

    76

  2. B

    30

  3. C

    12

  4. D

    10

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    Solution:

    76 ATP are formed due to aerobic breakdown of a molecule of sucrose (disaccharide with glucose and fructose hexoses). Each hexose oxidation yields 38 ATP . Two hexoses 38 X 2 = 76 ATP. There are 3 substrate level phosphorylation reactions (two in glycolysis and one in Krebs cycle). In each reaction per sucrose yields 4 ATP. Hence 3 substrate level phosphorylations yield 12 ATP. 

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