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Metabolism - Chapter 5 5 tasks: 1.Bringing nutrients into the cell 2.Breakdown nutrients into useable forms - catabolism 3.Make the building blocks the cell needs - biosynthesis 4.Make the building blocks into macromolecules - anabolism 5.Make new / replace cell parts
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Getting molecules into the cell
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Membrane transport
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Getting molecules into the cell - group translocation
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Metabolism = sum of catabolic and anabolic
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Biosynthesis: take monomers
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Make macromolecules
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Biosynthesis of macromolecules: Dehydration synthesis ATP
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Synthesis of macromolecules monomerpolymertype of bond
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Catabolic pathways
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Catabolic pathways: Glycolysis
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Catabolic pathways: TCA cycle
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Catabolic pathways: Pentose Phosphate Pathway
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We still need more ATP for the cell
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Generate energy through chemiosmosis and electron transport
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Aerobic Respiration
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Anaerobic respiration
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Fermentation
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Microbial Fermentation
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Comparison
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Who lives where? strict aerobe strict anaerobe aerotolerant anaerobe facultative anaerobe mircoraerophile
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Nutritional classes of microorganisms Heterotrophs Autotrophs Chemotrophs Phototrophs
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Nutritional classes of microorganisms carbon from CO 2
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Autotrophs
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Phototrophs
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Chemotrophs
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Regulation of metabolism Regulation of gene expression Regulation of enzyme activity
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Enzymes
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Enzymes - allosteric regulators
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Enzymes - feedback inhibition
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Genetics of Microorganisms Chapter 6
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DNA the genetic material of all cells
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DNA (a polymer of nucleotides)
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Roles of DNA
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DNA Replication
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DNA replication
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DNA Replication
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DNA replication
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Bacterial chromosomes
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Transcription
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Translation
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3 types of RNA
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Translation
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Genotype vs. Phenotype
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Transcription and Translation happen simultaneously in prokaryotes
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What about eukaryotes
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Gene Expression
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Regulation of genes inducible repressible constitutive
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Operons
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lac operon
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lac operon - off / repressed
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lac operon - on / induced
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Attenuation - Histidine operon
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Attenuation - Tryptophan operon
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Cells sense their environment: Two component regulation
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The genetics of prokaryotes Genome vs. plasmid
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Why do we care about plasmids?
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Conjugation
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Transformation
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Transduction
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What about mutations?
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What causes mutations?
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Mutations can result in …
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Looking for mutants in the lab
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Screening for potential mutagens: Ames Test
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Nosocomial infections and the rise of drug resistance
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