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

Praunitz and Kustner are related to reaction of

  1. IgA

  2. IgG

  3. IgM

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

Prausnitz & Kustner demonstrated transmission of IgE-mediated type 1 hypersenstivity by injecting serum containing IgE antibodies from allergic person into the skin of normal & non allergic person.it is called PK reaction

Multiple choice

Which of the following can act as a source of adult stem cells for transplantation in humans?

  1. Bone marrow
  2. Adipose tissue
  3. Blood

  1. 1 and 2

  2. 2 and 3

  3. 1 and 3

  4. All of the above

  5. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are three accessible sources of autologous adult stem cells in humans:

Bone marrow, which requires extraction by harvesting, i.e. drilling into bone (typically the femur or iliac crest)

Adipose tissue (lipid cells), which requires extraction by liposuction, and
Blood, which requires extraction through pheresis, wherein blood is drawn from the donor (similar to a blood donation) and passed through a machine that extracts the stem cells and returns other portions of the blood to the donor. Stem cells can also be taken from umbilical cord blood just after birth.

Multiple choice

A universal recipient belongs to the blood group

  1. AB

  2. O

  3. B

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

Individuals with blood type AB are considered universal recipients because their red blood cells possess both A and B antigens, and their plasma lacks both anti-A and anti-B antibodies.

Multiple choice

Directions: Read the following information and answer the given question.

Seema’s mother was working in the kitchen. Seema came inside and started cutting vegetables with a sharp knife. Her mother stopped her from using a knife but she didn't agreed. Suddenly she got a cut on her finger and it started bleeding. After 2 or 3 minutes the bleeding stopped.

Which of the following cells are responsible for formation of blood clot?

  1. Red blood cells

  2. White blood cells

  3. Platelets

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

Platelets are the blood cells responsible for the clotting process, which stops bleeding after an injury.

Multiple choice

Where are B lymphocytes located?

  1. Efferent lymph

  2. Blood and lymphoid tissue

  3. Blood

  4. Lymph nodes

  5. Reticuloendothelial cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

B lymphocytes are located here.

Multiple choice

Specific immunity to M. tuberculosis in mice, can be transferred to naive histocompatible recipients by which of the following?

  1. B-cells

  2. T-cells

  3. Macrophages

  4. Neutrophils

  5. IgG
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

T-cells are important for immunity to M. tuberculosis through the provision of Th1 cytokines,  such as IFN-gamma to activate macrophages containing the bacilli and perhaps also the participation of cytotoxic T-cells. The latter may kill macrophages,  which cannot be rescued by cytokines thereby releasing the bacteria to be taken up by fresh young macrophages. They can be activated to become killers.