A) Osmosis - Movement of water by diffusion.
B) Nucleoplasm - Site of active synthesis of ribosomal RNA.
C) Mesosome - Infolding of cell membrane and characteristics of eukaryotes.
D) Pili - Elongated tubular surface structures (made of special protein) of bacteria.
Correct Answer: C
Solution :
[c] Mesosome is special structure, formed by the extensions of plasma membrane. It helps in the formation of cell wall, DNA replication and distribution to daughter cells. They also help in respiration, secretion processes, to increase the surface area of the plasma membrane and enzymatic content. It is the characteristic of prokaryotes.
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