Keratin Essay

There are different types of proteins. Fibrous proteins, for example, can be correlated with structure. Keratin is the main component of hair and nails that form protofibrils and consist of two pairs of alpha helices that are twisted together in a left-hand coil. The flexibility of keratin decreases as disulfide bond cross-links between protofibrils increases. Keratin is also found in skin and wool. Silk fibroin has the ability to form flexible, but the inextensive fibers are of great strength. It has a semicrystalline array of antiparallel beta sheets where layers of glycine side chains alternate with layers with alanine and serine side chains. Collagen is the main protein component of connective tissue. Collagen is found in tendons and cartilage. Every third residue is glycine. The other amino acids are proline and hydroxyproline. Collagen, therefore, forms a triple helical structure with strong tensile strength. Collagen molecules have the ability to aggregate to form fibrils. These fibrils are covalently cross-linked by derivative groups of histidine and lysine. Elastin have elastic properties and form a three-dimensional network of fibers that have
Unlike carbohydrates, proteins and lipids are similar and contain monomers to make polymers. Unlike lipids, carbohydrates and proteins make up a larger group of molecules called macromolecules. Unlike proteins, carbohydrates and lipids are macronutrients. Proteins and carbohydrates differ slightly based on their chemical composition and dietary requirements. Proteins and lipids also differ from each other. Proteins are building blocks of energy that is needed by the body. They make and repair hair, muscles, etc. Lipids are considered to be fats. They help by insulating the body. Carbohydrates and lipids also differ from each other by the fact that lipids contain nitrogen and sulfur with smaller