Ch_03_Lecture_2[1]

Ch_03_Lecture_2[1] - Chapter 3 The Molecules of Cells...

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1 Chapter 3 The Molecules of Cells 0 (Continued)
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2 3.7 Polysaccharides are long chains of sugar units 0 Linked together by what reactions ? Polysaccharides are polymers of ????? monosaccharides dehydration
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3 Starch and glycogen are polysaccharides That store sugar for later use Cellulose is a polysaccharide found in plant cell walls 0 Starch granules in potato tuber cells Glycogen granules in muscle tissue Cellulose fibrils in a plant cell wall Glucose monomer Cellulose molecules STARCH GLYCOGEN CELLULOSE O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O OH OH Figure 3.7 unbranched or branched cross-linked by H-bonds
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4 Figure 3.8A: Feather’s oily coating repels water LIPIDS Lipids are diverse compounds That consist mainly of C and H atoms linked by nonpolar covalent bonds − fats, phospholipids, steroids : energy storage, structural, and metabolic functions there is very little oxygen, which makes them more or less hydrophobic 0 3.8 Fats are lipids that are mostly energy-storage molecules
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5 Fats, also called triglycerides Are lipids whose main function is energy storage Consist of glycerol linked to three fatty acids 0 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 H 2 O H H H H OH OH OH H HO C O C C C Fatty acid Glycerol H H H H H CH 2 O O O CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 CH 2 CH 2 CH 2 CH 2
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Ch_03_Lecture_2[1] - Chapter 3 The Molecules of Cells...

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