Create a diagram of an amino acid and indicate the functional groups involved. For example the protein may not be functional if the amino acid sequence is changed. Nonpolar amino acids are the opposite hydrophobic in that they avoid contact with liquid. Every amino acid also has another atom or group of atoms bonded to the central atom known as the r group which determines the identity of the amino acid. There are two a chains each with 141 amino acids and two b chains each with 146 amino acids.
Start studying biology test 2 chapter 9. The simplest and smallest amino acid is glycine for which the r group is a hydrogen h. Amino acid chains proteins. Amino acids are usually classified by the properties of their side chain into four groups.
There are 20 amino acids that make up proteins and all have the same basic structure differing only in the r group or side chain they have. These interactions play a major role in protein folding and give proteins their 3 d structure. Because there are two different subunits hemoglobin exhibits heteroquaternary structure. This could alter the trait they code for.
It is based on. Below is a listing of the 20 amino acids grouped by their r group properties. Biological molecules can contain many different types and combinations of functional groups and a biomolecules particular set of groups will affect many of its properties including its structure solubility and reactivity. If all of the monomers in a protein are identical there is homoquaternary structure.
Proteins create all traits we see. They can be subdivided according to their properties dictated by the functional groups they. The side chain can make an amino acid a weak acid or a weak base and a hydrophile if the side chain is polar or a hydrophobe if it is nonpolar. Learn vocabulary terms and more with flashcards games and other study tools.
Functional groups are chemical motifs or patterns of atoms that display consistent function properties and reactivity regardless of the exact molecule they are found in. For instance if the r group is a hydrogen atom then the amino acid is glycine while if its a methyl ch 3 text ch3 ch 3 start text c h end text start subscript 3 end. Start studying bio148 exam 2 practice. It could lead to.