The molecules supply the main source of short-term energy used in cellular respiration is - G) carbohydrates.
All living organisms carry out cellular respiration in order to get energy for cellular processes. All biomolecules proteins, lipids, and carbohydrates provide energy by breaking down during this process. however, sugar molecules or carbohydrates are used to provide short-term and immediate energy in the form of ATP by cellular respiration.
Proteins -
- During extreme starvation when all carbohydrates and fats in the body are used up.
- The respiratory quotient (RQ) of proteins - 0.83–0.9.
Carbohydrates-
- The major respiratory substrate is in form of glucose or carbohydrates in cells.
- The respiratory quotient (RQ) of carbohydrates - 1.
Fats-
- used only if carbohydrates are in short supply.
- It yields almost twice as much energy as carbohydrates generally do not use.
- The respiratory quotient (RQ) - 0.71
Thus, carbohydrates like glucose and sucrose are probably the two most common organic molecules that organisms require to produce short-term energy from cellular respiration.
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