Antibodies are proteins that consist of polypeptides that b

Antibodies are proteins that consist of ___ polypeptides that bind to the antigen in the ___ region. Select one: four; active site two; active site four; constant four; variable two; variable

Solution

d. four, variable

They are immune system related proteins also called Immunoglobulins which consists of four polypeptides. From the four polypeptides two are heavy chains and two are light chains to form a Y shaped molecule. The tips of the Y shaped molecule greatly varies with amino acid sequences among different antibodies. This variable region provides the specificity for binding with the specific antigen.