R4RIN – MCQs, Mock Tests | Biochemistry Biochemistry -Immune System

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

1. autoimmunity
2. complement system
3. clonal selection
4. tolerance

✅ Correct Answer: 4

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

1. Activation of killer T lymphocytes
2. Activation of B lymphocytes
3. The inflammatory response
4. Mobilization of complement proteins

✅ Correct Answer: 3

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

1. Macrophages
2. T cells
3. B cells
4. Lymphocytes

✅ Correct Answer: 1

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

1. Exotoxin
2. Cytotoxic T cell
3. Endotoxin
4. Suppressor T cell

✅ Correct Answer: 2

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

1. Pollen
2. Mold
3. Dust
4. Bee sting

✅ Correct Answer: 4

What type of B cell remains dormant in the body but can respond rapidly if the same antigen appears again?

1. T cells
2. Memory cells
3. Plasma cells
4. Macrophages

✅ Correct Answer: 2

The maturation of T cells and the production of particular T cell receptors occurs in the

1. thyroid gland
2. thymus gland
3. testes
4. . all of these

✅ Correct Answer: 2

Which of the following provide specific defense against viruses and bacteria?

1. T cells
2. B cells
3. Complement
4. inflammation

✅ Correct Answer: 2

Which of these is a type of specific defense against pathogens?

1. Lymphocytes
2. Macrophages
3. Phagocytes
4. Leukocytes

✅ Correct Answer: 1

In animals blood clots serve the function of

1. consuming invading organisms
2. helping them match the background coloration of the habitat
3. stimulating production of killer T lymphocytes
4. repairing damage to the body wall

✅ Correct Answer: 4

What is the result of invasion of a body by pathogens?

1. Infection
2. Inflammation
3. Swelling
4. Pus

✅ Correct Answer: 1

What is the behavior in which T cells and B cells constantly travel throughout the body seeking out and destroying foreign substances?

1. Antibody-mediated immune response
2. Immune surveillance
3. Cell-mediated immune response
4. Vaccination

✅ Correct Answer: 2

In a fetus where are lymphocytes produced?

1. In the spleen
2. In the bone marrow
3. In the liver
4. In the heart

✅ Correct Answer: 3

Which of the following produces the antibodies employed in the specific immune response of vertebrates?

1. B lymphocytes
2. T lymphocytes
3. Neutrophils
4. Macrophages

✅ Correct Answer: 1

Which of the following is not part of the vertebrate immune system?

1. Lymphocytes
2. Antibodies
3. Cardiac glycosides
4. Lymph nodes

✅ Correct Answer: 3

The protein produced by B cells that binds to a specific antigen is

1. phagocyte
2. leukocyte
3. vaccine
4. antibody

✅ Correct Answer: 4

Which of the following characteristics are common in lymphocytes macrophages and neutrophils?

1. They are all part of the nonspecific immune response in vertebrates
2. They are all part of the specific immune response in vertebrates
3. They are all part of the internal defenses of nonvertebrates
4. They are all types of white blood cells

✅ Correct Answer: 4

Which of the following blood proteins can destroy pathogens?

1. Major histocompatibility complex
2. Platelets
3. Fibrinogen
4. Complement system

✅ Correct Answer: 4

Which of these is part of the lymphoid system in humans?

1. Liver
2. Stomach
3. Tonsils
4. Kidneys

✅ Correct Answer: 3

What type of B cell is like a tiny factory that produces antibodies identical to the B cell receptor that bind to the original antigen?

1. T cells
2. Memory cells
3. Plasma cells
4. Macrophages

✅ Correct Answer: 3