Question

state two reasons why lipids are rarely used as a respiratory substrate compound to carbohydrates according to biology 8-4-4

Answer 1

A respiratory substrate is a molecule from which energy can be liberated to produce ATP in a living cell. Glucose is not the only respiratory substrate. All carbohydrates, lipids and proteins can also be used as respiratory substrates. Respiratory Quotient (RQ) can be measured by the ratio of the volume of carbon dioxide evolved to that of oxygen consumed by an organism, tissue, or cell in a given time i.e, RQ = VCO

2

/VO

2

.

Here, from the above table infers that lipid and protein will have a lower RQ value than 1, since more oxygen will be needed to oxidize the fats and lipids then to oxidize the carbohydrates.

Answer 2

Answer:

A respiratory substrate is a molecule from which energy can be liberated to produce ATP in a living cell. Glucose is not the only respiratory substrate. All carbohydrates, lipids and proteins can also be used as respiratory substrates. Respiratory Quotient (RQ) can be measured by the ratio of the volume of carbon dioxide evolved to that of oxygen consumed by an organism, tissue, or cell in a given time i.e, RQ = VCO

2

/VO

2

Here, from the above table infers that lipid and protein will have a lower RQ value than 1, since more oxygen will be needed to oxidize the fats and lipids then to oxidize the carbohydrates.