Question

question 17
2.5 pts
the site on the antibody where the epitope binds is called the -------------.
fab
fc
hypervariable region
question 18
2.5 pts
the amount of antibiodies in theserum is called a titer.
true
false

Explanation:

Question 17

To solve this, we recall antibody structure: The hypervariable region (part of the Fab region's variable domain) is the site where the epitope (antigenic determinant) binds. Fab is the fragment with antigen - binding, but the specific binding site within Fab is the hypervariable region. Fc is for effector functions, not binding epitopes.

The titer of antibodies in serum refers to the concentration or amount of antibodies. So the statement "The amount of antibodies in the serum is called a titer" is correct.

Answer:

C. hypervariable region

Question 18