Question

Which among the following is absent in bacteria?
A.Cell wall
B.Mesosome
C.Mitochondria
D.RNA

Answer 1

Hint: Bacteria can be defined as single-celled microscopic organisms that can exist both inside and outside of a host organism. Some bacteria cause harmful effects though most of them serve as a beneficial one. Bacteria are used in many industrial and medical processes.
Bacteria are considered as prokaryotic unicellular organisms.
Complete step by step answer:
-They do not have the membrane-bound organelles like mitochondria, golgi complex.
-They only contain ribosomes in the cytoplasm.
-They also contain mesosomes, which serve as the site of respirations. Mesosomes are infoldings that are present in the plasma membrane to increase the surface area.
-The plasma membrane of the bacteria is surrounded by the cell wall.
-They do not have a true nucleus – instead, they consist of a nucleoid which is known as the chromosome with its association with proteins and RNA.
Sometimes DNA is also present as genetic material for some bacteria.

Thus, the correct answer is option C. Mitochondria.

Note:
Some bacteria are present in the digestive system and gut. These bacteria help to break down the food. Some beneficial bacteria help to produce oxygen in the industry, some are used to create antibiotics also. Bacteria are useful in food production industries such as to make yogurt and fermented foods.