BIO 105 Lecture Notes - Lecture 2: Waterproofing, Hydrogen Bond, Nitrogenous Base

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30 Jan 2017
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Water- biologically essential to life: polarity, hydrogen bonds. Most important cell molecules are based on carbon. Carbon tends to bond with: hydrogen, oxygen, nitrogen. 4 groups of biological macromolecules: carbohydrates, lipids-fats, proteins, nucleic acids. *example exam question: which of the following is considered one of the four macromolecules common to all life: carbs- simple sugars, lipids- fatty acids, proteins- amino acids, nucleic acids- nucleotides. Humans: 50-65% water, baby: 75% water (easily dehydrate, fat holds less water by weight than muscle- so thinner people will have higher % of water. Carbohydrates: contains c, h, o, sugars for energy and structural materials, types- monosaccharides (glucose, fructose), disaccharides (sucrose- table sugar), and polysaccharides. Carbs are huge: many glucose bound together, starch-plants, glycogen-animals, cellulose (most abundant on earth) Lipids- fats: diverse molecules, do not easily dissolve in water (hydrophobic, non-polar substances. 3 flavors: simple- triglycerides, complex- phospholipid, steroids- cholesterol, testosterone. Functions: cell membranes, energy, hormones, insulation, water repellent, vitamins.

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