BIOL 205 Lecture Notes - Lecture 1: Chemical Polarity, Bicarbonate, Deuterium

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Living organisms are made of atoms of certain elements, mostly combined into molecules. The structure of an atom determines what types of bonds it can form with other atoms. The unique properties of water derive from the polarity of water molecules. An element is a substance composed entirely of one kind of atom. There are 25 elements essential to the biology of living things. Trace elements are essential, but only in minute quantities: help prevent disease, common additive to food and water. Some trace elements needed by all life, others needed by only certain species. Elements are composed of only one kind of atom. All matter in biology is built up of atoms. Ato(cid:373)s are (cid:272)o(cid:373)posed of differe(cid:374)t (cid:272)o(cid:373)(cid:271)i(cid:374)atio(cid:374)s of (cid:1007) parti(cid:272)les that (cid:272)o(cid:373)prise their (cid:862)su(cid:271)- ato(cid:373)i(cid:272) stru(cid:272)ture(cid:863: protons- positive charge, neutrons- no charge, electrons- negative charge. *protons and neutrons are in nucleus, electrons circle around nucleus.

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