Relationship Between Structure And Function Essay

1179 Words Jun 11th, 2015 5 Pages
1.) Out of the eight themes in biology, the relationship between structure and function is a key component. For example, the three-dimensional structure of a protein not only defines its shape and size, but also its function. Proteins consist of a long chain of 20 amino acids folded up into complex shapes. Each nonpolar amino acid folds into the interior of the proteins during the folding stage, as they are hydrophobic. The primary and secondary structure determines the hydrophobicity of a protein. Each nonpolar amino acid folds into the interior of the proteins during the folding stage. For instance, membrane proteins contain large amounts of lipids, which are hydrophobic, as water and fats such as oil do not mix. The folding of a protein through all four stages, primary, secondary, tertiary, and quaternary, allow for interactions between amino acids that may be distance from each other in the primary sequence stage. In enzymes a few of these amino acids would form a site within the structure that would then catalyze the enzymatic reaction. This site, also known as the active site of enzymes, has amino acids that bind specifically to the substrate molecule. The secondary structure of a protein is how the amino acids join together into alpha helices and beta pleated chains, which in turn form hydrogen bonds. The tertiary structure begins when the disulfide bridges form, and maintain as well as begins to emerge the 3d shape. The last stage, the quaternary structure, is an…

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