PO_Lecture_06 - Lecture 6 Prokaryotic Cell Structure...

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Lecture 6 BBOM 11e Sec. 4.5-4.7, 11.9 Cell Envelope = Cell Membrane (CM) + Cell Wall (CW) Prokaryotic Cell Structure Nucleoid, Cytoplasm, Inclusion Bodies, Endospores BBOM 11e Sec. 2.2, 3.2, 4.11-4.13
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The Bacterial Cell Model: Rapidly growing Escherichia coli cells 70% Water 30% Dry Matter Protein (All parts) Lipid (Inner&Outer Membranes) DNA (Nucleoid, Plasmids) RNA (Ribosomes, …) Cytosol (Solutes for Biosynthesis) Polysaccharide (CW) Lipopolysaccharide(CW) Of what is it made? Cytoplasm Cell Envelope Read: BBOM 11e Sec. 3.2 Cellular composition based on cell fractionation and biochemical analysis
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Hallmark Structure of the Prokaryotic Cell: The Nucleoid The aggregated DNA in a prokaryotic cell Other terms related to DNA : Genome : all genes in an organism Chromosome : large genetic element(s) carrying most genes essential for life. Plasmid : smaller genetic element, often carrying adaptive, non-essential genes The functional equivalent of the nucleus in eukaryotic cells
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ds DNA DNA-binding proteins RNA polymerase Nucleoid and Cytoplasm in Prokaryotic Cells Nucleoid mRNA Ribosome BBOM 11e Fig.2.1 Ribosomes (25-30 nm particles) E. coli TEM thin section
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Storage and Positioning Inclusions
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PO_Lecture_06 - Lecture 6 Prokaryotic Cell Structure...

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