Which best describes the structure of the molecules that make up protein?

Answer 1

Carboxyl group + amino group + side chain

Answer 2

Proteins are composed of amino acids linked together by amide linkages. An amino acid is a chiral carboxylic acid containing an amine group on the second carbon and any number of varying R groups after the second carbon. There are 20 naturally occurring amino acids that compose proteins, the order in which they are connected is referred as a protein's primary structure.

A protein's secondary structure is determined by the R groups of the amino acids are their affinity for attraction by hydrogen bonding and other intermolecular forces. Generally there are four types of interaction, hydrophillic (water loving), hydrophobic ( water hating) , ionic bridges, and sulfur-sulfure bridges. Secondary structures account for the alpha helix spiral and the beta pleated sheet shapes of proteins.

A proteins tertiary structure is its overall shape as a macromolecule. In order to perform the specific functions of its role, a protein must be a precise shape determined by the amino acid interactions, any deviation from this shape tends to render the protein useless.

Although all proteins have structure from primary to tertiary, not all proteins have a quaternary structure. Quaternary structure is the joining of proteins to achieve a higher function. For example hemoglobin, the component of your blood that delivers oxygen, is composed of one iron (II) ion and four heme protein groups. On the other hand, insulin which regulates your blood glucose level, has no quaternary structure to speak of.

Answer 3

h