Lecture_7 - Carbohydrates Learning Objectives Role of...

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Carbohydrates Monosaccharides and their classification Cyclization of glucose Disaccharides (lactose and sucrose) Polysaccharides (starch, glycogen, cellulose) Learning Objectives Role of carbohydrates in biosphere
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What Are Carbohydrates? • Carbohydrates (saccharides) are: - most abundant biological molecules - accumulators of the solar energy in biosphere - energy sources for heterotrophic organisms (including us) • Plants use the solar energy to synthesize carbohydrates from CO 2 and H 2 O. • Carbohydrates contain carbon, oxygen and hydrogen atoms according to the formula (C·H 2 O) n , where n 3. • The energy is stored in carbohydrates in the form of chemical bonds. • Plant-eating animals metabolize the carbohydrates, use the released energy, and return CO 2 and H 2 O to the biosphere.
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Monosaccharides • Monosaccharides are polyhydroxyalcohols containing at least three carbon atoms. • Monosaccharides are small carbohydrates that cannot be decomposed by hydrolysis. • Monosaccharides are classified according to: - the chemical nature of their carbonyl group - the number of carbon atoms Aldose is a monosaccharide with an aldehyde group ( - COH ). Ketose
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This note was uploaded on 01/27/2011 for the course BIOCH 2EE3 taught by Professor Zhorovb during the Spring '10 term at McMaster University.

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Lecture_7 - Carbohydrates Learning Objectives Role of...

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