growth unit ii

8
MICROBIAL GROWTH AND CELL CYCLE

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bsc i sem theory

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MICROBIAL GROWTH AND CELL CYCLEMicrobial growth refer both to increase in cell size and in number of cell in a populationDefination of GrowthThe growth of bacteria is defined as an increase in the number of cell and not in the size or weight of the cell.When bacteria are inoculated into a suitable medium and incubated under appropriate conditions, a tremendous increase in the number of cells occur with in a relatively short timeThe process of bacterial growth involves a wide variety of chemical reaction many of which involve energy transformationOther reaction involve the biosynthesis of building blocks of macromolecules by polymerization reactions.As macromolecules accumulaye in the cytoplasm of the cell, they are assembled into new structure such as the cell wall, cytopllasmic membrane, flagella ribosomes, inclusion bodies, enzyme complexes eventually leading to cell divisionReproductionThe most common and most important mode of reproduction in bacteria is by means of transverse binary fission which is an asexual reproduction process.Binary fissionIn transverse binary fission the DNA first divides into two equal halves and then there is the gradual invagination of the cell wall from the middle of the bacillus.When the septum formation