GENERAL BOTANY Lecture 6

GENERAL BOTANY Lecture 6 - GENERAL BOTANY Lecture 6 -...

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GENERAL BOTANY Lecture 6 - Biological molecules I. Types of biological molecules A. Inorganic - cofactors, catalysts, equilibria, etc., many participate as part of or with organic molecules B. Organic - carbohydrates, lipids, proteins, nucleic acids, porphyrins, and secondary plant products II Classification, structure, and function of major biological molecules A. Carbohydrates 1. Sugars and related compounds - ENERGY a) 1) Hexoses of central importance in cell metabolism b) Sucrose - a disaccharide composed of glucose and fructose - major translocated carbohydrate in plants c) Polysaccharides 1) Starch - branched polymer of glucose a) Amylose - linear polymer ( α -1,4) b) Amylopectin - branched polymer ( α -1,6) c) Easily hydrolyzed to glucose d) Major storage carbohydrate 2) Cellulose - linear polymer of glucose a) Glucose units connected differently ( β -1,4) b) Difficult to hydrolyze c) Structural carbohydrate (along with hemicellulose, {xylose, arabinose}, lignin {coniferyl, coumaryl, synapyl
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