Metabolism The sum total of ALL chemical reactions within a cell Catabolic Anabolic

Oxidation/reduction reactions

Biological Oxidation

ATP is made in catabolic reactions and used in anabolic reactions

Ways cells make ATP Substrate level phosphorylation Oxidative phosphorylation Photophosphorylation

Types of Bacterial Metabolism Fermentation Respiration Aerobic Respiration Anaerobic Respiration Photosynthesis

Keep in mind…glucose becomes many different things

Fermentation The incomplete breakdown of glucose with an organic compound serving as the final electron acceptor Only pathway operating is glycolysis

Fermentation

Lactic Acid Bacteria

Saccharomyces produces ethanol

Fermentation products can vary

Aerobic Respiration The COMPLETE breakdown of glucose to CO2 and H2O with an inorganic compound serving as the final electron acceptor

Remember the pathways in aerobic respiration are… Glycolysis Some use Pentose Phosphate Pathway instead TCA cycle Electron transport chain

What is made as a result of the TCA cycle? ATP Reducing power Precursor metabolites made from alpha-ketoglutarate and oxaloacetate

Electron Transport Chain Found in the cytoplasmic membrane Contains electron carriers Flavoproteins Iron-sulfur proteins Quinones Cytochromes

Model for energy release in ETC

ETC in prokaryotes

ATP yield from aerobic respiration

Comparison of three types of metabolism

Remember we are focusing on catabolic reactions Generate ATP for later use by cell Generate precursors for other pathways Need to re-oxidize coenzymes for continual use

Precursor metabolites