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

Agglutinin is an antibody which aggregates a particulate antigen on BBCs. Wheat germ agglutinin binds strongly to

  1. surface lipoproteins on resting T-cells

  2. surface glycoproteins on resting T-cells

  3. surface glycoproteins on resting B-cells

  4. surface glycoproteins on activated T- and B-cells

  5. surface lipoproteins on activated T- and B-cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Within 24 h of stimulation by lymphocyte polyclonal activators, high concentrations of binding sites for this lectin appear on the surface of the cell.

Multiple choice

The Rh (Rhesus) blood group is related to

  1. A Antigen

  2. B Antigen

  3. O Antigen

  4. AB Antigen

  5. D antigen
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The Rh (Rhesus) blood group is related to D antigen on red cells, present in 85% of the population (Rh+).Antibody to D antigen can be raised in Rh individuals by transfusion of Rh+ blood or when red cells from a Rh+ fetus enter the circulation of a Rh mother. This can cause haemolytic disease of the newborn .

Multiple choice

Blood is a type of

  1. areolar tissue

  2. squamous tissue

  3. striated tissue

  4. fluid tissue

  5. adipose tissue
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option as blood is a type of fluid tissue.

Multiple choice

G - 6 - P dehydrogenase deficiency is associated with haemolysis of

  1. Leucocytes.

  2. Lymphocytes.

  3. Platelets.

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

 Glucose-6-phosphate dehydrogenase deficiency is a genetic disorder that occurs most often in males. This condition mainly affects red blood cells, which carry oxygen from the lungs to tissues throughout the body. In affected individuals, a defect in an enzyme called glucose-6-phosphate dehydrogenase causes red blood cells to break down prematurely. This destruction of red blood cells is called hemolysis.

Multiple choice

Damage to thymus in a child may lead to

  1. a reduction in hameoglobin content of blood.

  2. a reduction in stem cell production.

  3. loss of antibody mediated immunity.

  4. loss of cell mediated immunity.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Thymus gland is associated with production T-lymphocytes ,which are important part of our immune system. They get matured in thymus gland .So,damage to thymus in a child may lead to loss of cell mediated immunity.

Multiple choice

___________ carries all the information about the organism.

  1. Platelets

  2. WBC

  3. RBC

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

DNA carries all the genetic information about an organism - it contains the complete blueprint for building and maintaining that organism. Blood cells (RBCs, WBCs, platelets) do not contain DNA or carry the organism's genetic information - RBCs lack nuclei entirely in mammals.