Biology

Human Immunity and Blood

2,096 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 of the following is NOT a component of the immune system?

  1. White blood cells

  2. Antibodies

  3. Red blood cells

  4. Lymph nodes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Red blood cells are responsible for carrying oxygen and nutrients to cells throughout the body. They are not part of the immune system.

Multiple choice

What type of white blood cell is responsible for engulfing and destroying foreign particles?

  1. Neutrophils

  2. Lymphocytes

  3. Monocytes

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

Neutrophils are the most abundant type of white blood cell and are the first to respond to infection. They engulf and destroy foreign particles, such as bacteria and viruses.

Multiple choice

Which of the following is NOT a type of immune cell?

  1. Neutrophils

  2. Lymphocytes

  3. Macrophages

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

Platelets are involved in blood clotting and are not part of the immune system.

Multiple choice

Which type of immune response is responsible for the production of antibodies?

  1. Innate immunity

  2. Adaptive immunity

  3. Humoral immunity

  4. Cell-mediated immunity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Humoral immunity is a type of immune response that involves the production of antibodies. Antibodies are proteins that bind to foreign particles and mark them for destruction by other immune cells.

Multiple choice

Which of the following is NOT a type of antibody?

  1. IgG

  2. IgA

  3. IgM

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

IgD is not a type of antibody. It is a type of immunoglobulin that is found on the surface of B cells.

Multiple choice

What is the role of the bone marrow in the immune system?

  1. To produce red blood cells

  2. To produce white blood cells

  3. To store red blood cells

  4. To regulate the immune response
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The bone marrow is a soft tissue located inside bones. It is responsible for producing white blood cells, including neutrophils, lymphocytes, and monocytes.

Multiple choice

Which type of immune response is responsible for the destruction of infected cells?

  1. Innate immunity

  2. Adaptive immunity

  3. Humoral immunity

  4. Cell-mediated immunity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cell-mediated immunity is a type of immune response that involves the destruction of infected cells by cytotoxic T cells.

Multiple choice

Which of the following is NOT a type of phagocyte?

  1. Neutrophils

  2. Lymphocytes

  3. Macrophages

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

Lymphocytes are not phagocytes. They are a type of white blood cell that is responsible for the adaptive immune response.

Multiple choice

Which type of MHC molecule is responsible for presenting antigens to CD8+ T cells?

  1. MHC class I

  2. MHC class II

  3. MHC class III

  4. MHC class IV
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

MHC class I molecules present antigens to CD8+ T cells, which are cytotoxic T cells responsible for killing infected or cancerous cells.

Multiple choice

Where are MHC class II molecules primarily expressed?

  1. On all nucleated cells

  2. On antigen-presenting cells (APCs)

  3. On T cells

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

MHC class II molecules are mainly expressed on antigen-presenting cells (APCs), such as macrophages, dendritic cells, and B cells, which capture and process antigens for presentation to CD4+ T cells.

Multiple choice

Which MHC molecule is involved in the presentation of antigens to CD4+ T cells?

  1. MHC class I

  2. MHC class II

  3. MHC class III

  4. MHC class IV
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

MHC class II molecules present antigens to CD4+ T cells, which are helper T cells responsible for activating other immune cells and coordinating immune responses.

Multiple choice

What is the term for the region of an MHC molecule that binds to an antigen?

  1. Antigen-binding site

  2. Peptide-binding groove

  3. MHC pocket

  4. Antigen-recognition site
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The peptide-binding groove is the region of an MHC molecule that binds to and holds the antigen peptide for presentation to immune cells.

Multiple choice

Which MHC class is responsible for presenting antigens to natural killer (NK) cells?

  1. MHC class I

  2. MHC class II

  3. MHC class III

  4. MHC class IV
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

MHC class I molecules present antigens to natural killer (NK) cells, which are cytotoxic lymphocytes responsible for killing infected or cancerous cells.

Multiple choice

What is the term for the process by which MHC molecules bind to and display antigens?

  1. Antigen presentation

  2. MHC binding

  3. Antigen recognition

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

Antigen presentation is the process by which MHC molecules bind to and display antigens on the cell surface, enabling immune cells to recognize and respond to foreign invaders.

Multiple choice

Which MHC class is involved in the presentation of antigens to cytotoxic T cells?

  1. MHC class I

  2. MHC class II

  3. MHC class III

  4. MHC class IV
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

MHC class I molecules present antigens to cytotoxic T cells, which are responsible for killing infected or cancerous cells.