Chemical Bonds   Macromolecules:     Protein Structure DNA Structure Carbohydrates Fats   Metabolism:     Glycolysis Fermentation Respiration TCA Cycle

Protein Structure ▼▼▼   Amino Acid:   Protein:   Proteins are chains of amino acids. An amine group (NH2) links to a carboxyl group (COOH). The carboxyl group is the usual organic acid. Acid means that the hydrogen has a tendency to separate becoming plus charged while leaving a minus charge on the oxygen. There are 20 amino acids. They each have a different R group. Here are three examples of R groups: Methionine: Tyrosine: Valine: Folding: The chains fold over each other while being synthesized creating a three dimensional structure which is globular. Tertiary Structure - is the over-all structure. Secondary Structure - is the interaction between segments which are near each other. Primary structure - is the sequence of subunits in the chain. Secondary structure includes hydrogen bonds. These bonds are very weak individually, but they tend to be numerous. A hydrogen bond means that a hydrogen atom attached to one group is drawn to a negative charge on another group near it. TOP