BIO SCI 93 Chapter Notes -Glycosidic Bond, Phosphodiester Bond, Adenine

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 93
• Professor: Diane O' Dowd

Document Summary

Elements and compounds reactions: 92 in nature ratio. Matter- anything that takes up place and has mass. Element- substance that cannot be broken down to other substances by chemical. Compound- substance consisting of two or more different elements combined in a fixed. 20-25% of 92 natural elements are essential elements an organism needs to be healthy. O,c,h,n = 96% living matter: other 4% = ca, p, k, s. Trace elements- required by an organism in minute quantities: fe. An element"s properties depend on the structure of atoms. Atom- smallest unit of matter that still retains the properties of an element. Atomic nucleus- center of an atom, packed with protons and neutrons: electrons form cloud around nucleus, attracted to positive nucleus. Proton and neutron = 1. 7e-24 g: 1 dalton = 1 amu = 1. 7e-24 g, mass of electron = 1/2000 mass of a neutron/proton. Mass number- sum of protons and neutrons in the nucleus of an atom.