Question

which of the following is true regarding antigens?
multiple choice
they have molecular weights of around 1000.
they have one antigenic determinant (epitope).
they are considered normal by the immune system.
they can contain many different antigenic determinants (epitopes).
they are usually made of lipids.

Explanation:

Antigens are substances that can trigger an immune response. They are typically large molecules (molecular weight > 10,000), not around 1000. Antigens are recognized as foreign by the immune system (not normal). They can be proteins, polysaccharides, etc., not usually lipids. An antigen can have multiple antigenic determinants (epitopes), which are the specific parts of the antigen that antibodies or immune cells recognize.

Answer:

They can contain many different antigenic determinants (epitopes).