LIFESCI 7A Study Guide - Comprehensive Final Exam Guide - Protein, Dna, Rna
Document Summary
Electronegativity: measure of how much an atom attracts electrons. Nonpolar covalent bond: bonding e- shared equally between two atoms. Polar covalent bond: bonding e- shared unequally between two atoms. Amphipathic: molecules have polar and nonpolar regions (or both hydrophilic and hydrophobic regions--textbook de nition) H atom of one molecule with electronegative atom of another. Hydrophilic--based on ability to form h bonds with water: most carbon-based polar molecules can form h bonds with water, so hydrophilic and polar are used interchangeably. Van der waals" forces: interactions between atoms that have a temporary partial charge. Smooth glass surfaces (silicon dioxide is a polar hydrophilic compound) Cells have diff shapes, intracellular contents, organization depending on their function within the body. Cells need membrane to distinguish itself from surroundings and be selective about what gets in and out. Most permeable | oxygen urea glucose na+ | least permeable. The steeper the concentration gradient, the higher the rate.
