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

Blood agar is

  1. differential and selective

  2. differential and enriched

  3. differential and used for enrichment

  4. enriched and selective
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blood agar is enriched with sheep blood and it also aids in identifying bacteria on the basis of different hemolysis patterns.

Multiple choice

Which of the following is a blood group?

  1. A

  2. H

  3. N

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

A is one of the major blood groups in the ABO blood typing system. The other major types are B, AB, and O. H, N, and P are not standard blood group designations.

Multiple choice

Level of IgG increases and decreases respectively in

  1. hyperimmunisation and Bence Jones proteinemia

  2. severe malnutrition and lymphoid aplasia

  3. IgA myeloma and chronic lymphoblastic leukemia

  4. agammaglobulinemia and rheumatoid arthritis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

IgG level increases and decreases in severe malnutrition and lymphoid aplasia, respectively.

Multiple choice

Which of the following statements is correct?

  1. Blood cells are not made in the bone marrow in autoimmune hemolytic anemia.

  2. Faulty RBC makes genes codes for red blood cells in hemolytic anemia.

  3. Premature destruction of RBC takes place in autoimmune hemolytic anemia.

  4. Fewer RBCs and less hemoglobin are made in the body in autoimmune hemolytic anemia.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Autoimmune hemolytic anemia (AHA) causes the premature destruction of red blood cells. It causes fatigue, pale skin, shortness of breath and dark urine. AHA is a type of acquired haemolytic anemia.

Multiple choice

Assertion: Allergy is caused by histamines. Reason: Antibodies are Y-shaped protein molecules.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true but R is NOT the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true.

  5. Both A and R are false.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct,  because the correct explanation is: the binding of antigen-antibody complex with the mast cells releases histamines which cause allergy.

Multiple choice

Which of the following statements is/are not correct?

  1. Presence of antigens in the blood is not necessary for the production of antibodies.

  2. Yeast cells derived their energy from glucose by glycolysis.

  3. Starch acts as a nutrient but cellulose does not.

  4. Vitamin B12 does not occur in plants.

  5. All of correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This statement is wrong because presence of antigens in the blood is necessary for the production of antibodies. Thus, this option is correct.

Multiple choice

Which of the following is a class III molecule of the immune system?

Histocompatibility molecules are glycoproteins expressed at the surface of almost all vertebrate cells. The most rapid and severe rejection of foreign tissue occurs when there is a failure to properly match the donor and recipient for the major histocompatibility molecules. There are three categories of these molecules viz. I, II and III.

  1. Heat shock protein

  2. H2-K molecule

  3. HLA-A

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

Heat shock proteins are class III molecules of the immune system.

Multiple choice

Which of the following autoimmune diseases is characterised by an increase in WBC count and inflammation of blood vessels?

  1. Cogan's syndrome

  2. Churg-Strauss syndrome

  3. Erythema nodosum

  4. Thromboangiitis obliterans
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Increase in WBC count along with inflammation of the blood vessels is seen in Churg-Strauss syndrome (CSS). The inflammation of blood vessels can restrict blood flow to vital organs and tissues, sometimes permanently damaging them.

Multiple choice

What happens when type B blood is given to a person with type A blood?

  1. B Ag from the donor reacts with anti-B ab in the recipient.

  2. B Ag from the recipient reacts with anti-B ab in the recipient.

  3. B Ag from donor reacts with anti-A ab in the recipient.

  4. A Ag from donor reacts with anti-B ab in the recipient.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When type B blood is given to a person with type A blood, B Ag from the donor reacts with anti-B ab in the recipient. Complement is fixed and the red blood cells are lysed. Person with type A blood possesses type B antibodies. When type B blood is given to a person with type A blood, it causes lysis.