Question

Respiratory enzymes occur in
A. Chloroplast
B. Mitochondria
C. Lysosomes
D. Peroxisomes

Answer 1

Hint: Cell is the basic structural and functional unit of life. These cells contain various cell organelles which perform the various functions and lead to working of the cell. One of the cell organelle is known to produce the energy and thus is called as the powerhouse of the cell.

Complete Answer:
- Cell organelles are the various components of a cell which help the cell in performing various functions. Some cell organelles have a single membrane while other cell organelles have double membranes.
- Mitochondria is one such cell organelle which consists of a double membrane. They are also known as the powerhouse of the cell as they produce energy in the form of ATP. Many biochemical reactions which are involved in the cellular respiration occur within the mitochondria.
- The shape of mitochondria resemble a rod with double membranes. The size of mitochondria ranges between 0.5 to 1.0 micrometre in diameter. The double membrane constitutes the outer and inner membranes.
- Apart from the membranes, the mitochondria also consists of a gel-like matrix. The inner membrane is folded into various folds called cristae which helps in increasing the surface area. Within the mitochondrial membrane, various respiratory enzymes and electron carriers for the electron transport system are present.
- Chloroplast is a double membrane cell organelle which is present in green plants. It consists of the green pigment called chlorophyll which is required for the process of photosynthesis.
- Lysosomes are membrane bound vesicles which contain digestive enzymes.
- Peroxisomes consist of oxidative enzymes such as catalase and urate oxidase. The respiratory enzymes are present in the inner membrane of mitochondria.

So, the correct answer is option (B).

Note: Various enzymes take part in the process of respiration. The cell organelle which is associated with the process of respiration is mitochondria. Chloroplast is a green plastid which is present in green plants.