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Question

A 60 kg adult consumed 0.5 mol sucrose. Can you find out the number of glycolytic pathways to completely convert 0.5 mol sucrose into pyruvate?
  1. 3.011×1023
  2. 12.044×1023
  3. 9.033×1023
  4. 6.022×1023


Solution

The correct option is D 6.022×1023
Given: Weight of adult = 60 kg
Amount of sucrose = 0.5 mol
To find: Number of glycolytic cycles to completely convert 0.5 mol sucrose into pyruvate

1 molecule of sucrose gives 1 molecule of glucose and fructose each.


0.5 mol of sucrose will give 0.5 mol of glucose and 0.5 mol of fructose.

1 mole of glucose = 6.022×1023 molecules
0.5 mol of glucose = 6.022×1023 molecules X 0.5 = 3.011×1023 molecules

Similarly, 0.5 mol of fructose = 3.011×1023 molecules

Glycolysis or glycolytic pathway is the breakdown of a hexose (glucose or fructose) into pyruvate. In other words, 1 molecule of glucose or fructose will undergo 1 round of glycolytic pathway to form 2 pyruvate molecules.
Hence, 3.011×1023 molecules of glucose will undergo 3.011×1023 rounds of glycolysis.
Similarly, 3.011×1023 molecules of fructose will undergo 3.011×1023 rounds of glycolysis.
Since 0.5 moles of sucrose molecules =  3.011×1023 glucose molecules +  3.011×1023 fructose molecules.
Therefore, 0.5 moles of sucrose will undergo 6.022×1023 rounds of glycolysis.

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