Immune System – Section 1

1. Lack of reaction to our own human leukocyte antigens (HLAs) is known as?

A. autoimmunity
B. complement system
C. clonal selection
D. tolerance

Correct Answer: D. tolerance

2. Which of the following components of the vertebrate immune response occurs first upon invasion by a virus or bacterium?

A. Activation of killer T lymphocytes
B. Activation of B lymphocytes
C. The inflammatory response
D. Mobilization of complement proteins

Correct Answer: C. The inflammatory response

3. Which of the following white blood cells act as scavengers when they engulf and digest pathogens?

A. Macrophages
B. T cells
C. B cells
D. Lymphocytes

Correct Answer: A. Macrophages

4. A cell which defends against body cells in which viruses are reproducing is

A. Exotoxin
B. Cytotoxic T cell
C. Endotoxin
D. Suppressor T cell

Correct Answer: B. Cytotoxic T cell

5. Which of the following is most likely to produce anaphylaxis in a susceptible individual?

A. Pollen
B. Mold
C. Dust
D. Bee sting

Correct Answer: D. Bee sting

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