Question:
Considering the following chemical equation, guess what could be the nature of respiratory substrate?
$2\,\mathrm{C}_{51}\mathrm{H}_{98}\mathrm{O}_{6} + 145\,\mathrm{O}_{2} \rightarrow 102\,\mathrm{CO}_{2} + 98\,\mathrm{H}_{2}\mathrm{O} + \text{Energy}$
Considering the following chemical equation, guess what could be the nature of respiratory substrate?
$2\,\mathrm{C}_{51}\mathrm{H}_{98}\mathrm{O}_{6} + 145\,\mathrm{O}_{2} \rightarrow 102\,\mathrm{CO}_{2} + 98\,\mathrm{H}_{2}\mathrm{O} + \text{Energy}$
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High hydrogen and low oxygen content in a molecule indicates fat as a respiratory substrate.
Updated On: Mar 6, 2026
- Carbohydrate as well as protein
- Fat
- Protein
- Carbohydrate
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Observing the chemical formula.
The given substrate has a very high proportion of carbon and hydrogen compared to oxygen, as seen in the formula C\textsubscript{51}H\textsubscript{98}O\textsubscript{6}. Such a composition is characteristic of lipids.
Step 2: Comparing respiratory substrates.
Carbohydrates have a C:H:O ratio of approximately 1:2:1, while fats have much less oxygen and more hydrogen. Proteins also contain nitrogen, which is absent here.
Step 3: Energy yield and oxygen requirement.
Fats require more oxygen for oxidation and produce more energy, CO\textsubscript{2}, and H\textsubscript{2}O compared to carbohydrates. The equation shows a large oxygen requirement, supporting fat oxidation.
Step 4: Conclusion.
The respiratory substrate represented in the equation is fat.
The given substrate has a very high proportion of carbon and hydrogen compared to oxygen, as seen in the formula C\textsubscript{51}H\textsubscript{98}O\textsubscript{6}. Such a composition is characteristic of lipids.
Step 2: Comparing respiratory substrates.
Carbohydrates have a C:H:O ratio of approximately 1:2:1, while fats have much less oxygen and more hydrogen. Proteins also contain nitrogen, which is absent here.
Step 3: Energy yield and oxygen requirement.
Fats require more oxygen for oxidation and produce more energy, CO\textsubscript{2}, and H\textsubscript{2}O compared to carbohydrates. The equation shows a large oxygen requirement, supporting fat oxidation.
Step 4: Conclusion.
The respiratory substrate represented in the equation is fat.
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