Question

The site of respiration in bacteria is?
A. Episome
B. Mesosome
C. Ribosome
D. Mitochondria

Answer 1

Hint:
 In bacteria, the process of respiration is performed in mesosomes. Mesosomes are folded invaginations in the cell membrane of bacteria. Their function is to increase the surface area required for respiration. They are sites of respiratory activity as they contain respiratory enzymes.

Complete answer:
Option (A) Episome
It is a genetic element present inside some bacterial cells. It is present mainly in the DNA of some bacteriophages that can replicate independently of the host. It is present in association with a chromosome with which it becomes integrated.

Option (B) Mesosome
Mesosomes or chondroid are present in the plasma membrane of bacteria. They have folded invaginations in the plasma membrane of bacteria. They are produced by the chemical fixation techniques.

Option (C) Ribosome
The ribosome is a complex molecule. It is made up of ribosomal RNA molecules and proteins. These proteins form a factory for protein synthesis in cells. They were discovered in 1955 by George E. Palade. He described them as small particles in the cytoplasm. They are preferentially associated with the endoplasmic reticulum membrane.

Option (D) Mitochondria
Mitochondria are known as membrane-bound cell organelles. They generate most of the chemical energy that is needed to power the cell's biochemical reactions. This Chemical energy is stored in a small molecule called adenosine triphosphate (ATP).

Thus, the correct answer is option C 'Mesosome'.

Note: Cellular respiration refers to an energy-generating process. It takes place in the plasma membrane of bacteria. In this process, Glucose is broken down into carbon dioxide and water. In aerobic cellular respiration it uses oxygen and other molecules such as nitrate (NO3) whereas anaerobic cellular respiration occurs without oxygen.