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BIOL 2051 (13)
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Chapter 2

Chapter 2 Notes

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Biological Sciences
BIOL 2051
All Professors

Chapter 2 Observing the Microbial Cell1Chapter 2 Observing the Microbial CellRead Section 2126SIZE OF PROKARYOTESProkaryotes are generally smaller than eukaryotesSmall size allows nutrients to reach all parts of cell quicklyProkaryotic cells can be as small as 02mThe smallest eukaryotic cells are 2m Coccitypically have diameter of 2 mSome microbiologists have proposed that bacteria smaller than 02 m exist in nature cells referred to as nanobacteriaIf one considers the space needed to house all essential molecules of life it is unlikely they could exist within a volume available in a cell less than 01 mProkaryotic cells can have a wide variety of cellular morphologies which are often helpful in identificationBacterial Shapes1Simplest shape is sphereosingularcoccus opluralcoccioArrangementCoccus single cells Diplococcus 2 cellsStreptococcuschains ofmore than 2 cells Staphylococcus grapelike cluster of cellsTetrads packets of 4 cells2Most common shape is rodsFigure oSingular bacillus26bacillioPlural oCan be very longthin or shortfatoOccur singly or in chains3SpiralsoRigid spiralshaped bacteria are called spirilla singularspirillumoFlexible spiralshaped bacteria are called spirochetesoVibriocurved rods
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