Question

Mesosome in a cell is a

• A. Membrane bound vesicular structure
• B. Chain of many ribosomes attached to a single mRNA
• C. Special structure formed by extension of plasma membrane
• D. Medium sized chromosome

Answer 1

The Correct Option is C

The question asks about the nature of a "mesosome" in a cell, providing four options to choose from. Let's evaluate each one to identify the correct description:

1. Membrane bound vesicular structure: While some cellular structures are membrane-bound, this option does not accurately describe a mesosome. Mesosomes are not simple vesicular structures; they have a specific formation process and function.
2. Chain of many ribosomes attached to a single mRNA: This describes a polyribosome or polysome, not a mesosome. Polysomes are involved in protein synthesis, not related to mesosome characteristics.
3. Special structure formed by extension of plasma membrane: This is the correct answer. A mesosome is indeed a specialized structure that forms as an invagination of the plasma membrane and is primarily found in prokaryotic cells such as bacteria. It is involved in cellular processes such as DNA replication and distribution to daughter cells during cell division.
4. Medium sized chromosome: This option refers to chromosomes and does not relate to mesosomes. Chromosomes carry genetic information, whereas mesosomes are part of the cellular membrane structure.

Thus, the mesosome is indeed a "Special structure formed by extension of plasma membrane". This conclusion can be drawn from understanding the structural and functional characteristics of mesosomes in bacteria.