Protein structure is the three-dimensional arrangement of atoms in a protein molecule. Proteins are polymers â specifically polypeptides â formed from sequences of amino acids, the monomers of the polymer. A single amino acid monomer may also be called a residue (chemistry) indicating a repeating unit of a polymer.
Developmental disability is a diverse group of chronic conditions that are due to mental or physical impairments. Developmental disabilities cause individuals living with them many difficulties in certain areas of life, especially in language, mobility, learning, self-help, and independent living.
About one in six children in the U.S. have one or more developmental disabilities or other developmental delays. 1  Basics Milestones, screening, causes and risk factors, and living with a disability. 2  Research & Tracking What weâve learned and CDCâs work. 3  Resource Center Print or order free materials.