MBB 222 Chapter Notes - Chapter 1: Manganese, Neurophysiology, Organic Chemistry

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1. 2 - the chemical basis of life: a hierarchical perspective. [more than 97% of the weight of most organisms consists of just six elements: hydrogen, oxygen, carbon, nitrogen, phosphorus, and sulfur (table 1. 1). The vast majority of this mass comes from hydrogen and oxygen, most of which is present as h2o (the human body is 70% water). In addition to the six most abundant elements, trace elements such as zinc, iron, manganese, copper, and cobalt are required for life, primarily as cofactors in proteins. Essential ions include calcium, chloride, magnesium, potassium, and sodium, many of which play key roles in cell signaling and neurophysiology. The amount of carbon in living organisms is disproportionately high, being 100 times more abundant in the human body than in earth"s crust. ] Covalent bonds form when two atoms share unpaired electrons in their outer shells.

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