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InterviewSolution
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Calculate the RQ for different respiratory substrates using appropriate formula. |
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Answer» The RQ for different respiratory substrates are: 1. Carbohydrates (R.Q. is 1) When carbohydrates are used as substrate, equal volumes of CO2 and O2 are released and consumed respectively, thus its R.Q. is 1. C6H12O6 + 6O2 → 6 CO2 + 6H2O R.Q. = 6CO2 / 6O2 = 1.0 2. Fats (R.Q. is less than 1) Substrates like fats are poorer in oxygen than carbohydrates. Thus, more oxygen is utilized for its complete oxidation. 2(C51H98O6) + 145O2 → 102CO2 + 98H2O + Energy R.Q. = CO2 / O2 = 102 / 145 = 0.7 3. Protein respiration (R.Q. is less than 1) 1. When proteins serve as respiratory substrate, they are first degraded to amino acids. 2. Then, amino acids are converted into various intermediates of carbohydrates. 3. However, amino acids have low proportion of O2 as compared to carbohydrates. 4. Thus, they require more O2 during their complete oxidation and value of R.Q. becomes less than 1. 5. In case of proteins, the R.Q. is approximately 0.9. |
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