Question

The difference between respiration and combustion is related to respiration being
A) Multistep
B) Enzyme controlled
C) Intracellular
D) All the above

Answer 1

Hint: In a variety of biochemical steps, the overall reaction takes place, some of which are redox reactions. Even though cellular respiration is a combustion reaction technically, because of the slow, controlled energy release from the series of events, it obviously does not resemble one when it takes place in a living cell.

Complete Answer:
Cellular respiration is a sequence of metabolic reactions that occur in the cells of organisms that transform chemical energy from oxygen or nutrient molecules into ATP and then remove waste products.

Now, let us find the solution from the options-
- Respiration is a biological reaction in living cells which exists.
- It is a long process which, in small steps, generates energy and is retained as ATP.
- Diverse enzymes are involved in the process.
- As heat, a part of the energy is released.
- In the last stage of the process, oxygen is often used as an oxidant. Respiration occurs at a normal temperature.
- Combustion is a non-cellular physicochemical process.
- It is a quick process that generates energy with a rise in temperature in one step.
- In such a process, no enzymes are present.
- The majority of the energy is released as heat. In the process, oxygen is often used directly.
- At high temperatures, combustion occurs.

Thus, the correct answer is option (D) All the above.

Note: Catabolic reactions that tear large molecules into smaller ones, generating energy because loose high-energy bonds, especially in molecular oxygen, are substituted by stronger bonds in products, are the reactions involved in respiration.