Which statement is not correct about the antibodies?
a. they are protein molecules that bind to the specific antigens
b. they are produced by memory b cells
c. they consist of 2 heavy chains and 2 light chains
d. they contain fixed and variable regions
e. they are also called immunoglobulins

b. They are produced by memory B cells

Explanation:

The rapid cell division in activated B cells is followed by the differentiation of daughter cells into the plasma cells. The plasma cells are the precursor for antibodies and memory B cells. The antibodies kill the antigens while memory B cells are long-lived cells.  

Hence, antibodies are not produced by memory B cells but by plasma cells.

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

-lavira: )