BIO 152 Lecture Notes - Lecture 1: Glycogen, Thymine, Adenine

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What elements are most abundant in living things: carbon, nitrogen, oxygen, phosphorus, sulfur, and hydrogen. Why is carbon so important to life: forms four bonds with other atoms, forms strong covalent bonds. Diversity of organic molecules: number of carbons, rings, chains, branches, single, double, triple bonds, incorporates other atoms: o, h, s, n, p. Use of carbon is important in organic chemistry. Polar bond: o shares electrons with h, difference in electronegativity, electrons closer to oxygen. Shape of molecule: o has paired electrons on two sides, h (slightly +) on two sides, bent v-shaped. Cellular chemistry is dependent upon water: hydrogen bonding allows water to be cohesive. Polar and charged sections of a molecule will interact with water and are called hydrophilic: likes water. Nonpolar areas of a molecule are hydrophobic: hates water. A molecule that has both polar and nonpolar regions is called amphipathic: loves and hates water. Diphtheria toxin: 60,000 da (60 kda), 60 g/mol 132 pounds.

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