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Different substrates get oxidized during...

Different substrates get oxidized during respiration. How does Respiratory Quotient (RQ) indicate which type of substrate,i.e., carbohydrate, fat or protein is getting oxidized > R . Q. = `(A)/(B)`. What do A and B stand for ? What type of substrates have R.Q. of 1, `lt 1 or gt 1 ` ?

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RQ is a ratio between `CO_(2)` produced during respiration and `O_(2)` Which is used .
`RQ =(A)/(B) = ("Volume of produced " CO_(2))/("Volume of used " O_(2))`
Energy currency means such a substances which provides energy for cellular processes. Whenever it is required, ATP is called currency of energy because in bonds of ATP, higher energy is in connected form other substances GTP, CTP, UTP etc. are energy donors.
RQ of carbohydrates = 1 during aerobic respiration.
RQ of fat and protein `lt 1` during germination
RQ of organic acid `gt 1` during aerobic respiration.
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