Read each question carefully. write your response in the space provided for each part of each question. answers must be written out in paragraph form. outlines, bulleted lists, or diagrams alone are not acceptable and will not be scored.
scientists are studying the structure and function of receptor x, a single-polypeptide protein that is found in the membrane around certain types of cells. receptor x contains no alpha-helices or beta sheets. a specific molecule outside the cells is recognized and bound by receptor x. the binding of the molecule to receptor x causes the cells to have a particular response.

to study the structure and function of receptor x, the scientists are altering the sequence of small sections of the receptor. both the normal sequence of a five amino acid section of receptor x and an altered sequence that contains two amino acid substitutions are shown in figure 1.