BSC 118 Lecture 5: BSC 118 Chapter 5

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Biological macromolecules: within cells, small organic molecules are often joined together to form large biological molecules called macromolecules, all living organisms are made up of four classes of macromolecules. Carbohydrates sugar (e. g. , monosaccharides and disaccharides) and polysaccharides) Lipids fats, phospholipids, sterols, and related molecules. Nucleic acids nucleotide polymers (dna and rna) In biological systems, monomers form larger [bio]polymers by enzyme*- catalyzed dehydration reactions covalent bonding of two molecules to each other through loss of a water molecule. Aldose if at end of carbon chain. Ketose if flanked by carbons within chain. The number of carbons in the carbon skeleton: many monosaccharides spontaneously form ring structures in aqueous solutions (e. g. , glucose, serve as a major fuel for cells (used to generate atp) Disaccharides: a disaccharide is formed when a dehydration reaction joins two monosaccharides, this covalent bond is called a glycosidic linkage or glycosidic bond, the most common disaccharide is sucrose.

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