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2-Structure_and_Function_Jan10

2-Structure_and_Function_Jan10 - Structure and func,on Chap...

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Structure’and’func,on’ Chap’1±’2±’3±’9’and’20’ 1’
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2’
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General’proper,es’of’cells’ Brock’Biology’of’Microorganisms±’13 th ’Edi,on.’ 3’
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General’func,on’of’cells’ Brock’Biology’of’Microorganisms±’13 th ’Edi,on.’ 4’
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Size’of’cells’ 5’ Limit:’0.5’ μm’–’750’ μm’in’diameter.’ Brock’Biology’of’Microorganisms,’13 th ’Edi±on.’ The’shape’of’the’cells’may’aFect’that.’
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Internal’structure’of’cells’ Brock’Biology’of’Microorganisms,’13 th ’Edi±on.’ 6’ PROKARYOTES’ Bacteria’ Archaea’ EUKARYOTES’ Eukarya
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The’membrane’ 7’ Brock’Biology’of’Microorganisms,’13 th ’Edi±on.’ FLUID’MOSAIC’ Ra±o’proteins/lipids’=’50%’or’ less’ Membrane’proteins:’ Sensors’ Adhesins’ Transporters’ Enzymes’
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The’membrane:’a’phospholipid’bilayer’ 8’ PHOSPHATIDYLETHANOLAMINE’ Brock’Biology’of’Microorganisms,’13 th ’Edi±on.’ Isoprene,’the’ archeal’lipid’chain.’
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9’ Brock’Biology’of’Microorganisms,’13 th ’Edi±on.’ Membrane’of’ Archaea’
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Stabiliza,on’of’the’membrane’ In’eukaryotes±’the’lipid’bilayer’is’stabilized’by’sterol±’which’consists’of’a’polar’ head±’a’ rigid ’planar’steroid’ring’structure’and’a’nonpolar’hydrocarbon’tail.’ Cholesterol – Animal cells Ergosterol – Fungi S7gmasterol – Plant cells and some protozoans In’prokaryotes±’sterols’are’almost’always’absent±’ ’the’membrane’is’stabilized’by’ hopanoids.’ 10’ Cholesterol’ The’ hopanoid’ diploptene’
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Membrane’ 11’ h‘p://www.youtube.com/watch?feature=player_detailpage&v=Rl5EmUQdkuI’
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Storage’of’DNA’ Prokaryotes’ Circular’molecule,’double’ stranded.’ Generally’haploid’(one’copy)’ Packaged’with’proteins’(H-NS’ and’other’Histone-like’protein),’ aggregates’to’form’the’ nucleoid)’ DNA’in’the’cytoplasm,’ribosomal’ RNA’encoded’on’the’ chromosome’ May’also’contain’ plasmids Eukaryotes’ Linear’molecules,’double- stranded.’ Generally’diploid’(two’copies)’ Packaged’with’proteins’ (Histones)’to’form’ chroma±n’ Fbers ,’the’chromosome.’ DNA’in’the’nucleus’ Nucleolus:’(DNA’that’code’for’ ribosomal’RNA,’ribosomal’ proteins,’immature’ribosome)’ 12’
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DNA,’RNA’and’proteins’ 13’ Brock’Biology’of’Microorganisms,’13 th ’Edi±on.’ DNA’polymerase’ RNA’polymerase’ Ribosome’
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