Which of the metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins?

(1) Glocose-6-phosphate 

(2) Fructose 1, 6, bisphosphate

(3) Pyruvic acid

(4) Acetyl Co-A

(4) Acetyl Co-A is common to respiration mediated breakdown of fats, carbohydrates and proteins. Glucose and fructose are phosphorylated to give rise to glucose-6-phosphate by the activity of the enzyme hexokinase.

Glucose-6-phosphate then converts into fructose 6 phosphate and further to fructose 1-6-bisphosphate. Pyruvic acid is the end product of glycolysis. 

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