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Question

If 5 molecules of glucose respired aerobically and another 5 molecules anaerobically, what is the total number of ATP and CO2 molecules expected form these reactions?


A

200 ATP and 60 CO2

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B

140 ATP and 40 CO2

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C

200 ATP and 40 CO2

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D

190 ATP and 36 CO2

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Solution

The correct option is C

200 ATP and 40 CO2


Aerobic respiration released 38 molecules of ATP and 6 molecules of CO2 for every Glucose molecule. Therefore if 5 molecules are respired, then it forms 38×5=190
ATPs and 6×5=30 CO2 molecules.

During anaerobic respiration one molecule of glucose releases 2 molecules of ATP and 2 molecules of CO2 for one glucose molecule. That is a total of 10 ATPs and 10 CO2 molecules. Therefore together we get a total of 190 + 10 = 200 ATP molecules and 30 + 10 = 40 CO2 molecules.

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