Bacterial Cytoplasm

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Bacterial Cytoplasm

	Bacterial Cytoplasm - The major cytoplasmic contents of bacterial cell include nucleus ( with out membrane), ribosomes, proteins and other water soluble components and reserve material. In most bacteria, extrachromosomal DNA(plasmid DNA) is also present. The bacterial nucleus is not enclosed in a defined membranous structure and contains the genetic material of the bacterial cell.
Electron micrographs of the bacterial nucleus show it as a region closely packed with fibrillar DNA Cytological, biochemical, physical and genetic studies of a variety of bacteria show that the bacteria nucleus contains a single molecule of circular, double stranded DNA. In addition to the bacterial "nuclear" DNA, bacteria also contain extrachromosomal DNA called plasmid DNA which replicates autonomously .
These plasmids confer on the bacterial cell, drug resistance, ability to produce proteinaceous toxins called bacteriocins or ability to catabolize unusual organic compounds (like in Pseudomonas). The size of DNA in these structures can be about one-tenth or less of that found in the bacterial nucleus but the number of copies may vary from one to many. These structures are also not enclosed in a membrane structure. The plasmid DNA is also double stranded and circular.

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Bacterial Cell Membrane Bacterial Ribosomes Bacterial Cytoplasm Cellular Reserve Materials Bacterial Organic Reserve Materials Fungal Cells Fungal Cell Wall Composition Fungal Cell Membrane Fungal Cytoplasm Fungal Mitochondria Fungal Ribosomes Fungal Reserve Materials