Proteins - Twenty of the amino acids are used to make...

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Proteins Importance of proteins Some important functions of proteins are listed below. enzymes (chemical reactions) hormones storage (egg whites of birds, reptiles; seeds) transport (hemoglobin) contractile (muscle) protective (antibodies) membrane proteins (receptors, membrane transport, antigens) structural toxins (botulism, diphtheria) Enzymes Enzymes are proteins that speed up the rate of chemical reactions. Example: The presence of an enzyme in the chemical reaction diagrammed below causes hypothetical chemicals A and B to react, producing C. Proteins are able to function as enzymes due to their shape. For example, enzyme molecules are shaped like the reactants, allowing the reactants to bind closely with the enzyme. Amino Acids Amino acids are the building blocks of proteins.
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Unformatted text preview: Twenty of the amino acids are used to make protein. Each has a carboxyl group (COOH) and an amino group (NH 2 ). Each amino acid is different and therefore has its own unique properties. Some amino acids are hydrophobic, others hydrophilic . The carboxyl or amino group may ionize (forming NH 3 + or COO-). The "R" group of some amino acids is nonpolar and the "R" group of some others is polar or it ionizes. Amino acids are joined together by a peptide bond . It is formed as a result of a condensation reaction between the amino group of one amino acid and the carboxyl group of another. Click here to view a web page which shows an animation of the formation of a peptide bond....
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This note was uploaded on 12/15/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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Proteins - Twenty of the amino acids are used to make...

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