Quiz: Immunology: Autoimmunity and Hypersensitivity — 8 domande

1. What is Guillain-Barré syndrome primarily characterized as?

A. A systemic autoimmune disease marked by antibodies against nuclear proteins

B. An autoimmune disorder involving immune-mediated damage to peripheral nerve myelin

C. A demyelinating disease of the central nervous system involving T cell attack

D. A chronic autoimmune disease targeting nicotinic acetylcholine receptors

Answer: (B)

Spiegazione

Guillain-Barré syndrome is characterized by immune-mediated damage to peripheral nerve myelin, often triggered by infections, as supported by the source definition.

2. What does chemotherapy primarily cause in relation to the immune system?

A. Secondary immunodeficiency by damaging immune cells

B. Autoimmune disorders through immune activation

C. Primary immunodeficiency due to genetic factors

D. Enhanced immune response against tumors

Answer: (A)

Spiegazione

Chemotherapy primarily causes secondary immunodeficiency by damaging or depleting immune cells, leading to a compromised immune response.

3. What is a key characteristic of Type I hypersensitivity reactions?

A. Immune complex deposition in blood vessels causing vasculitis

B. T cell-mediated delayed hypersensitivity leading to tissue inflammation

C. Cytotoxic reactions mediated by IgG antibodies targeting cell surface components

D. IgE-mediated immediate allergic reactions involving mast cell activation and histamine release

Answer: (D)

Spiegazione

Type I hypersensitivity is characterized by IgE-mediated immediate allergic reactions involving mast cell activation and histamine release, as described in the source.

4. What is an antigen in the context of the immune system?

A. A plasma protein that enhances immune responses through pathogen opsonization

B. A protein produced by B cells that recognizes and binds to pathogens

C. A substance that triggers an immune response, typically a foreign protein, polysaccharide, or molecule recognized by the immune system

D. A type of immune cell responsible for engulfing pathogens

Answer: (C)

Spiegazione

An antigen is defined as a substance that triggers an immune response, typically a foreign protein, polysaccharide, or molecule recognized by the immune system.

5. What are immunosuppressive drugs primarily used for?

A. To stimulate immune system activity in autoimmune diseases

B. To reduce or inhibit immune system activity in conditions like organ transplantation and autoimmune diseases

C. To enhance immune response against infections

D. To increase inflammation in chronic inflammatory conditions

Answer: (B)

Spiegazione

Immunosuppressive drugs are designed to reduce or inhibit immune system activity, often used in organ transplantation to prevent rejection or in autoimmune diseases to control immune-mediated damage.

6. Which enzyme encoded by HIV is responsible for converting viral ssRNA into DNA?

A. Neuraminidase

B. Reverse transcriptase

C. Hemagglutinin

D. Protease

Answer: (B)

Spiegazione

Reverse transcriptase is responsible for converting HIV's ssRNA into DNA, a key step in the viral replication cycle, as explicitly stated in the source.

7. What is the role of loss of immune tolerance to self-antigens in autoimmune disorders?

A. It enhances the immune response against pathogens

B. It causes the immune system to attack the body's own tissues

C. It prevents the immune system from recognizing foreign antigens

D. It increases the production of antibodies against external toxins

Answer: (B)

Spiegazione

Loss of tolerance to self-antigens causes the immune system to attack the body's own tissues, which is the fundamental mechanism underlying autoimmune diseases.

8. What is secondary immunodeficiency?

A. A deficiency caused by nutritional deficits

B. An acquired condition reducing immune response due to external factors

C. A congenital defect leading to immune system failure

D. A genetic mutation affecting immune cell development

Answer: (B)

Spiegazione

Secondary immunodeficiency is an acquired condition that reduces immune response due to external factors like infections or drugs, as stated in the source.