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.
Preferred terms are 'intellectual disability', 'cognitive disability', or the broader term, 'developmental disability.' Mental Retardation is clinically defined as, 'significantly below-average general intellectual functioning (IQ 70-75 or below), existing concurrently with deficits in adaptive behavior, and manifested before the age of 22.