Introduction to Metabolism

Introduction to Metabolism - Introduction to Metabolism...

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Introduction to Metabolism Bryant Miles Metabolism is the process through which living systems acquire and use free energy to carry out biological functions. In BICH 410 you learned the composition and structure of biological molecules. In BICH 411, you are going learn the reactions and pathways by which biomolecules are synthesized and degraded. Metabolism requires highly coordinated cellular activity. Metabolism performs 4 functions 1. Obtain energy for the cell. 2. Convert nutrients into macromolecules. 3. Assemble macromolecules into cellular structures. 4. Degrade macromolecules as required for biological function. Metabolism consists of catabolism and anabolism. Catabolism is the degradation pathways to salvage components and energy from biomolecules such as nucleotides, proteins, lipids and polysaccharides. The process generates energy. Anabolism is the biosynthesis of biomolecules such as nucleotides, proteins, lipids and polysaccharides from simple precursor molecules. This process requires energy. Biomolecules are composed predominantly of carbon, hydrogen, oxygen and nitrogen. N N N N NH 2 O OH OH H H H H O P -O O- O H 2 NC H C CH 2 OH O C NH 2 O O OH OH OH OH CH 2 OH HO O All living things require a source of energy, carbon, oxygen and nitrogen. I. Energy and Carbon Autotrophs – Self feeding. Autotrophs are prokaryotes that can produce all of their cellular components from simple molecules such as H 2 O, CO 2 , NH 3 and H 2 S. These are self sufficient cells that utilize CO 2 from the atmosphere as the carbon source.
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Chemolithotrophs -obtain free energy via the oxidation of inorganic compounds such as NH 3 , H 2 S or Fe +2 . Photoautrophs
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Introduction to Metabolism - Introduction to Metabolism...

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