KX Modifier - SPECIFIC REQUIRED DOCUMENTATION ON FILE. KX -- SPECIFIC REQUIRED DOCUMENTATION ON FILE. (EFFECTIVE DATE 7/1/2002) This modifier may be used to indicate that specific required documentation is on file in the patient's medical record. Documentation must be submitted upon request.
Proteins are made of amino acids hooked end-to-end like beads on a necklace. To simulate. a protein, you will make a model of your protein using a long chenille stem (the fuzzy. covered wire) and colored beads.
Proteins have very complex structures which is how their functions come about. Proteins are actually sets of amino acids bonded together. A primary structure is a simple chain of amino acids. The secondary structure is the folding of this chain, and in the tertiary structure the chain folds itself into a three dimensional shape.