HSCI 100 Lecture : chapter 2

• School: Simon Fraser University
• Department: Health Sciences
• Course: HSCI 100
• Professor: Nienkevan Houten

Document Summary

Covalent bonds: the strongest bond, form when 2 or more atoms share the electrons in their outer shell. Ion is an atom or group of atoms with a positive or negative electrical charge. Ionic bonds are weaker than covalent bonds: result from the attraction of oppositely charged ions, rather than shared electrons, take electrons not share. Major molecules of life: macromolecules: large biological molecules, carbohydrates, lipids, proteins, nucleic acids, many macromolecules are polymers: long molecules of many identical or similar building blocks strung together. { simple carbohydrates: found a simple and complex forms, monosaccharide: 1 carbon ring as found in glucose, disaccharide: 2 carbon rings as found in maltose, polysaccharides are made of many carbon rings(complex carbyhydrates) Linkages are important between sugar molecules- can"t break down cellulose: lipids, organic molecules that do not dissolve in water (non-polar, used as energy molecules (more energy/ gram than other biological molecules, found in cell membranes.