A specialised membranous structure in a prokaryotic cell which helps in cell wall formation, DNA replication and respiration is :
Answer: (C) Mesosome. Answer: (C) Mesosome Solution: The mesosome is a specialised membranous structure formed by infoldings (extensions) of the plasma membrane into the prokaryotic cell.
- A.Cristae
- B.Endoplasmic Reticulum
- C.Mesosome✓
- D.Chromatophores
Correct Answer
(C) Mesosome
Solution & Explanation
Answer: (C) Mesosome Solution: The mesosome is a specialised membranous structure formed by infoldings (extensions) of the plasma membrane into the prokaryotic cell. NCERT lists its functions as helping in cell wall formation, DNA replication and distribution to daughter cells, and also respiration and secretion. Cristae and ER are eukaryotic, and chromatophores (in cyanobacteria) bear pigments rather than performing these functions. NCERT Reference: Ch 8, p.90-91, lines 42-44 (p.90) and 3-4 (p.91): "A special membranous structure is the mesosome which is formed by the extensions of plasma membrane into the cell... They help in cell wall formation, DNA replication and distribution to daughter cells. They also help in respiration".