BIO1011 Study Guide - Quiz Guide: Guanine, Cytosine, Adenine

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Of 92 naturally occurring elements, 16 occur in all organisms, 23 in living matter. Major elements in organisms: c, h, n, o. Minor elements in organisms: p, s, ca, na, k. Trace elements: mn, fe, co (cobalt), cu, zn. C, h, n and o are the lightest elements capable of forming covalent bonds. The strength of a covalent bond is inversely proportional to atomic weight. Carry the genetic code for making proteins. Nucleotides consist of a 5-carbon sugar, a phosphate group and a nitrogenous base. Base pairs are joined by hydrogen bonds. Three major classes of amino acids: non-polar side chains, hydrophobic chemical groups, polar side chains, hydrophilic, electrically charged side chains, acidic or basic, hydrophilic. Amino acids join via a condensation or dehydration reaction which produces water. The resulting linkage is called a peptide bond. Linear sequence of amino acids in a protein. Determined genetically by order of base pairs in codons.

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