BIOL 1001 Chapter : Chapter 2 Cont Ch 3
Document Summary
Water moderates temperature: water heats and cools slowly, must break h-bonds/must form h-bonds, water is and effective coolant, removes heat by evaporation. Water is an unusual solid: ice: ice: water is less dense when frozen, h2o solid state, h-bonds become rigid which means they become further apart. Mol: versatility: forms 4 covalent bonds, organic molecules= c+h (only made by living things) Functional groups: see table 3-1 in book. How are organic molecules synthesized: organic molecules in all living organisms share two similarities, 1. Formed by the modular approach: stick subunits. Dehydration synthesis (fig 3-1: takes water away, 2. Hydrolysis synthesis (fig 3-2: get water back. Polysaccharide: many sugars, long term energy storage, structural. Chitin: polymer with glucose subunits and n containing functional groups, makes up insect exoskeleton and fungus cell walls. Lipids (fats: slippery-oily, nonpolar; mostly c&h, hydrophobic, oils, waxes, fats, phospholipids, and steroids.
