Alpha helix and beta pleated sheet. 1. Proteins are ... 2.

Orders of protein structure: primary, secondary, tertiary, and quaternary. Quaternary Structure. Fibrous proteins are typically elongated and insoluble. There are about 20 different amino acids that occur naturally in proteins. A protein molecule is very large compared with molecules of sugar or salt and consists of many amino acids joined together to form long chains, much as beads are arranged on a string. 4. Tertiary Structure. Primary Structure. Most proteins contain only small amounts of methionine. Primary Structure describes the unique order in which amino acids are linked together to form a protein. Learn About the 4 Types of Protein Structure. 3. Although it is not yet possible to explain all of the functions of a protein … Protein Structure The structure of a protein may be globularor fibrousdepending on its particular role (every protein is specialized). Orders of protein structure. Proteins also contain an amino acid with five carbon atoms (glutamic acid) and a secondary amine (in proline), which is a structure with the amino group (―NH 2) bonded to the alkyl side chain, forming a ring. Proteins of similar function have similar amino acid composition and sequence. Secondary Structure. Globular proteins are generally compact, soluble, and spherical in shape.