MDCAT Biology MCQs

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

Correct answer A. IgE

Correct answer A. Variable regions of both heavy and light chains

Correct answer D. Disulfide bonds

Correct answer D. 2

Correct answer D. 10

Correct answer C. Epitope

Correct answer D. Cytotoxic (killer) T cells

Correct answer C. Releasing cytokines that activate B cells and cytotoxic T cells

Correct answer C. Suppressor (regulatory) T cells

Correct answer C. Memory cells formed during the first exposure are already present

Correct answer A. Artificially acquired passive immunity

Correct answer C. Naturally acquired passive immunity

Correct answer D. Naturally acquired active immunity

Correct answer D. No memory cells are produced and the received antibodies are gradually broken down

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