Immune System
Which of the following statements is false regarding B cells?

B cells can undergo class switching and produce a different antibody type
B cells that recognize high concentrations of antigens (self) in the absence of other signals undergo apoptosis in the bone marrow
B one marrow stem cells migrate to the thymus and develop into B cells
B cells synthesize antibodies and put them on their cell surface

ANSWER DOWNLOAD EXAMIANS APP

Immune System
Numerous antibodies can be prepared, against one antigen, each binds to unique epitopes. How is this antibody diversity generated?

Both (a) and (b)
Antibody proteins can physically change their shape to bind different epitopes
By rearrangements of the DNA encoding the variable regions of the heavy and light chains
By the combination of different heavy and light chains that form the antigen binding site

ANSWER DOWNLOAD EXAMIANS APP

Immune System
Which of the following is correct for isoantigens?

They are antigens found in all members of a species
They are antigens found in all members of different species
They are antigens found in some members of different species
They are antigens found in some members of a species

ANSWER DOWNLOAD EXAMIANS APP