Biology
Grade-10
Easy
Question
How many numbers of oxygen atoms are required for aerobic oxidation of one pyruvate?
- 10
- 8
- 5
- 12
Hint:
- Pyruvate is the end product of glycolysis.
- The sequence of reactions leading to the formation of pyruvate from glucose is the common pathway occurring during anaerobic and aerobic respiration.
- Depending upon the availability or non-availability of molecular oxygen and the cellular metabolic need, pyruvate takes up different routes for its metabolism.
The correct answer is: 10
5 numbers of oxygen atoms are required for the aerobic oxidation of one pyruvate.
- Two molecules of pyruvate are formed from the breakdown of glucose at the end of glycolysis. The pyruvate is then converted to acetyl Co A which is further oxidized in the mitochondria.
- Acetyl Co A enters the Krebs cycle and is oxidized to CO2, H2O, ATP, FADH2, and NADH+.
Summarizing the overall reaction, we get (Pyruvate) 
On balancing this equation becomes, 
Thus, the number of atoms required for complete aerobic oxidation of one pyruvate is 5.
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