Biology

Human Immunity and Blood

2,051 Questions

Human immunity and blood questions cover the physiological mechanisms protecting the body against diseases and the components of blood. Topics include blood groups, cell mediated immunity, monoclonal antibodies, and blood coagulation. These biology topics frequently appear in general science sections of competitive exams.

Blood groupsCell mediated immunityMonoclonal antibodiesBlood coagulationCancer immunology

Human Immunity and Blood Questions

Multiple choice

Which cell type is responsible for presenting antigens to T cells and initiating immune responses?

  1. Macrophages

  2. Neutrophils

  3. Dendritic cells

  4. Natural killer (NK) cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dendritic cells are specialized antigen-presenting cells that play a critical role in initiating immune responses by presenting antigens to T cells.

Multiple choice

Which type of immune response is characterized by the production of antibodies?

  1. Cell-mediated immune response

  2. Humoral immune response

  3. Innate immune response

  4. Adaptive immune response
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The humoral immune response is characterized by the production of antibodies, which are proteins that recognize and bind to specific antigens.

Multiple choice

What is the role of regulatory T cells (Tregs) in immune tolerance?

  1. Promoting inflammation and tissue destruction

  2. Suppressing immune responses and preventing autoimmunity

  3. Activating the complement system to destroy pathogens

  4. Stimulating the production of antibodies against foreign antigens
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Regulatory T cells (Tregs) play a crucial role in immune tolerance by suppressing immune responses and preventing autoimmunity.

Multiple choice

Which signaling pathway is commonly targeted by immunosuppressive drugs to inhibit B cell activation?

  1. JAK/STAT pathway

  2. MAPK pathway

  3. PI3K/Akt pathway

  4. TGF-β pathway
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The PI3K/Akt pathway is a key signaling pathway involved in B cell activation and differentiation. Immunosuppressive drugs often target this pathway to inhibit B cell responses.

Multiple choice

What type of immune cell is responsible for phagocytosing and destroying pathogens?

  1. Neutrophils

  2. Macrophages

  3. Dendritic cells

  4. B cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Neutrophils, a type of phagocytic white blood cell, are the first responders to infection, engulfing and destroying pathogens through phagocytosis.

Multiple choice

What is the role of memory cells in the immune response?

  1. Producing antibodies

  2. Engulfing pathogens

  3. Releasing cytokines

  4. Remembering past infections
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Memory cells retain information about past infections, enabling a rapid and robust immune response upon re-exposure to the same pathogen.

Multiple choice

Which cytokine is primarily responsible for coordinating the inflammatory response?

  1. Interferon-gamma

  2. Interleukin-2

  3. Tumor necrosis factor-alpha

  4. Interleukin-10
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tumor necrosis factor-alpha (TNF-alpha) is a key cytokine involved in initiating and regulating the inflammatory response.

Multiple choice

Which type of immune response is characterized by a delayed hypersensitivity reaction?

  1. Cell-mediated immunity

  2. Humoral immunity

  3. Innate immunity

  4. Adaptive immunity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cell-mediated immunity, involving the activation of T cells and macrophages, is responsible for delayed hypersensitivity reactions, such as those seen in tuberculin skin tests.

Multiple choice

Which type of immune response is responsible for generating memory cells?

  1. Cell-mediated immunity

  2. Humoral immunity

  3. Innate immunity

  4. Adaptive immunity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Adaptive immunity, involving the activation and differentiation of lymphocytes, is responsible for generating memory cells that provide long-term protection against pathogens.

Multiple choice

What is the term used to describe the interaction between the endocrine system and the immune system?

  1. Endocrine-Immune Crosstalk

  2. Neuroendocrine Axis

  3. Psychoneuroimmunology

  4. Neuroimmunomodulation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Endocrine-immune crosstalk refers to the communication between the endocrine system and the immune system, allowing for hormonal regulation of immune responses and vice versa.

Multiple choice

Which of the following is not a type of cancer?

  1. Carcinoma

  2. Sarcoma

  3. Leukemia

  4. Myeloma
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Myeloma is a type of blood cancer, while carcinoma, sarcoma, and leukemia are all types of solid tumors.

Multiple choice

Which type of immune cell is primarily responsible for the maternal immune response during pregnancy?

  1. T cells

  2. B cells

  3. Natural killer cells

  4. Macrophages
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

T cells, particularly regulatory T cells (Tregs), play a key role in maintaining immune tolerance and preventing the rejection of the fetus during pregnancy.

Multiple choice

Which type of fetal antigen is primarily responsible for inducing alloimmune thrombocytopenia?

  1. Human platelet antigen-1a (HPA-1a)

  2. Human platelet antigen-5b (HPA-5b)

  3. Human platelet antigen-9 (HPA-9)

  4. Human platelet antigen-15 (HPA-15)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

HPA-1a is the most common fetal platelet antigen that can induce alloimmune thrombocytopenia in pregnant women who lack this antigen.

Multiple choice

Which type of immune cell is primarily responsible for attacking and destroying infected cells during pregnancy?

  1. Natural killer cells

  2. Cytotoxic T cells

  3. Helper T cells

  4. B cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Natural killer cells play a crucial role in the innate immune response during pregnancy by recognizing and destroying infected cells, including those infected with viruses or bacteria.

Multiple choice

What is the name of the condition in which the maternal immune system produces antibodies against fetal red blood cell antigens, leading to hemolytic disease of the newborn (HDN)?

  1. Alloimmune hemolytic anemia

  2. Alloimmune thrombocytopenia

  3. Pre-eclampsia

  4. Gestational diabetes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Alloimmune hemolytic anemia is a condition in which the maternal immune system produces antibodies against fetal red blood cell antigens, leading to the destruction of fetal red blood cells and potential complications for the fetus.