Question

question 65 (0.5 points)
antigen binding sites are located on the ________ region of an antibody.
○ constant
○ variable

Explanation:

Antibodies have variable and constant regions. The variable region is responsible for antigen binding as its amino acid sequence varies among different antibodies, allowing it to recognize and bind to specific antigens. The constant region has a more conserved sequence and is involved in other functions like activating the immune system, not antigen binding.

Answer:

B. variable (assuming the second option is labeled as B, with the text "variable")