Immunity MCQs

Correct answer A. An Rh-negative mother carries an Rh-positive fetus after earlier sensitisation

Correct answer A. Both B and T lymphocytes

Correct answer A. To reduce T cell attack on the foreign tissue antigens of the graft

Correct answer A. It activates only lymphocytes with complementary receptors, which then divide by mitosis

Correct answer B. Virus-infected cells and cancer cells

Correct answer D. Agglutination

Correct answer C. They form pores in the bacterial membrane causing lysis

Correct answer B. They are eliminated or inactivated during their development

Correct answer D. A small molecule that becomes antigenic only when attached to a larger carrier protein

Correct answer C. A B lymphocyte and a myeloma (cancer) cell

Correct answer D. To trigger a secondary response that raises antibody levels and memory cell numbers

Correct answer C. Toxoid, an inactivated form of the bacterial toxin

Correct answer D. Oral polio (Sabin) vaccine

Correct answer D. Intact skin and mucous membranes

Correct answer A. Breaking down bacterial cell walls

Correct answer C. Dilation of arterioles and increased capillary permeability

Correct answer B. They make neighbouring cells resistant to viral replication

Correct answer A. Neutrophils

Correct answer D. Macrophages

Correct answer C. It displays fragments of engulfed antigen on its surface with MHC proteins