BIOL 1201 Lecture Notes - Lecture 1: Molybdenum Cofactor, Atomic Nucleus, Electron Shell
Document Summary
Living organisms are subject to basic laws of physics and chemistry. An element substance that cannot be broken down to other substances by chemical reactions. A compound substance consisting of two or more elements in a fixed ratio: a compound has characteristics from those of its elements. About 20-25% of the 92 elements are essential to life. Carbon, hydrogen, oxygen, and nitrogen make up 96% of living matter. Most of the remaining 4% consists of calcium, phosphorous, potassium, and sulfur. Trace elements are those requires by an organism in minute quantities give example of molybdenum cofactor or hemoglobin. A(cid:374) ele(cid:373)e(cid:374)t"s properties depe(cid:374)d o(cid:374) the stru(cid:272)ture of its ato(cid:373) An atom is the smallest unit of matter that still retains the properties of an element. Relevant subatomic particles include: neutrons (no electrical charge, protons (positive charge, electrons (negative charge) Neutrons and protons from the atomic nucleus. Electrons form a cloud around the nucleus.
