Question

Which of the cell organelle lacks membrane?
A) Mesosome
B) Mitochondria
C) Ribosome
D) Liposome

Answer 1

Hint: It is the cell organelle which is not bounded by membrane and consists of 65% RNA, 35% protein and helps in protein synthesis.

Complete answer
Let’s discuss the given options and find the correct answer.

Mesosome: Mesosome, also known as chondroids are found in prokaryotic cells formed by extension of plasma membrane into the cell. They help in DNA replication and cell division or excretion of exoenzymes. It also helps to increase the surface of the plasma membrane as a result increases the enzymatic content of the cell.
Mitochondria: Mitochondria is the powerhouse of the cell. It is a spherical or ovoid organelle found in the cytoplasm of eukaryotic cells and containing genetic material separate from that of the host; it is responsible for the conversion of food to usable energy in the form of ATP (adenosine triphosphate)
Ribosome: Ribosome is a small organelle found in all cells. It is involved in the production of proteins by translating messenger RNA. It is not bounded by any cell membrane
Liposome: Liposome is an aqueous compartment enclosed by a bimolecular membrane, typically of phospholipid; a lipid vesicle.

Hence, the option C: Ribosome is the correct answer.

Note:Ribosomes lack cell membrane and the process of making ribosomes is called ribosomes biogenesis. They are responsible for protein synthesis which helps in growth and development of the body. During protein production the ribosome gets bound to the membrane bound endoplasmic reticulum by transcolon.