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Cards In This Set
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nature and expression of growth
Growth may be defined as increase in |
Cellular constituents
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It leads to a rise in
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Cell number
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When microorganisms reproduce by processes like
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Budding or binary fission
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In the latter individual cells enlarge and divide to yield
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Two progeny of approximately equal size
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Growth also results when cells become
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Longer or larger
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If the microorganism is
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Coenocytic
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That means it is multinucleate organism in which
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Nuclear divisions are not accompanied by cell divisions growth
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Which results in an increase in cell size but not in
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Cell number
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It is not convenient to investigate the growth and reproduction of
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Individual microorganisms because of their small size
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So while studying growth microbiologist follow
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Changes in total population number
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Population growth is studied by analysing the
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Growth curve of a microbial culture
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When microorganisms are cultivated in
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Liquid medium
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They are usually grown in
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Batch culture or closed system
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That means they are incubated in a
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Closed culture vessel with a single batch of medium
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Since no fresh medium is provided during incubation so
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Nutrient concentration decline and concentration of wasteS increase
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