Metabolism: Glycolysis, TCA Cycle, and the ETC-Oxidative ...

Metabolism: Glycolysis, TCA Cycle, and the

ETC-Oxidative Phosphorylation

Metabolism

The sum of the chemical changes that convert nutrients into energy and the chemically complex products of cells

Hundreds of enzyme reactions organized into discrete pathways

Substrates are transformed to products via many specific intermediates

Metabolic maps portray the reactions

A Common Set of Pathways

Organisms show a marked similarity in their major metabolic pathways

Evidence that all life descended from a common ancestral form

There is also significant diversity Autotrophs use CO2; Heterotrophs use organic

carbon; Phototrophs use light; Chemotrophs use Glc, inorganics use S and obtain chem energy through food generated by phototrophs.

The Sun is Energy for Life

Phototrophs use light to drive synthesis of organic molecules

Heterotrophs use these as building blocks CO2, O2, and H2O are recycled

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