InterviewSolution
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InterviewSolution
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Question : Describe : RespiratoryQuotient. |
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Answer» Solution :During aerobic respiration, `O_(2)`is CONSUMED and `CO_(2)` is released. The ratioof the volumeof `CO_(2)` evolved to the volume of `O_(2)`consumed in respiration is called the respiratoryquotient. `RQ = ("Volume of " CO_(2) "evolved ")/("Volume of "O_(2) " consumed ")` The respiratoryquotientdepends upon the TYPE of respiratory substrated usedduring respiration. RQ of Carbohydrates : Whencarbohydrates are used as substrate and are completely oxidised,the RQ will be 1, because amountsof `CO_(2) and O_(2)` are evolved and consumed. Equation : `C_(6) H_(12) O_(6) + 6O_(2) to 6CO_(2) + 6H_(2) O ` + Energy `RQ = (6 CO_(2))/( 6O_(2)) = 1.0` RQ of fat : When fats are used in respiration, the RQ used than 1. Calculation for a fatty acid, tripalmitin, if usedas a substrate is shown. `2(C_(51) H_(98)O_(6)) + 145O_(2) to 102 CO_(2) + 98 H_(2) O` + Energy `RQ = (102 CO_(2))/(145 O_(2))` = 0. 7 Protein : Whenproteins are respiratorysubstrates the ratio would be about 0.9. When organic acid is used for respiration the RQ remain above 1. e.g. equation for respiration of oxalic acid : `2 (CO OH)_(2) +O_(2) to 4CO_(2) + 2H_(2) O` Energy `RQ = (4 CO_(2))/( 1 O_(2))` = 4 NOTE : Inliving organismsrespiratory substrates are often more than one , pure proteins or fatsare never usedas respiratorysubstrates. |
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