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

Type 'O' is a universal donor because it has _____.

  1. no antibodies

  2. antibodies in diluted form

  3. no antigens

  4. no white blood cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Type O blood lacks both A and B antigens on red blood cells, making it compatible with all other blood types. Universal donors can give to anyone because recipient antibodies won't attack O cells. Type O has both anti-A and anti-B antibodies in plasma, but the absent RBC antigens are what matters for donation.

Multiple choice

Persons with group AB are known as universal acceptors because _____.

  1. they are weak persons and always need blood transfusion

  2. the blood of all other groups can be transfused into them without any harm

  3. they have very less quantity of blood

  4. they can undergo AB blood transfusion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blood type AB lacks both anti-A and anti-B antibodies in plasma, allowing it to receive blood from any group (A, B, AB, or O) without antibody-mediated rejection. Universal acceptors can receive from all donors because their immune system won't attack any blood type antigens. Option A and C are false descriptions, and D merely restates the blood type.

Multiple choice

Which of the following is the largest wandering phagocytic cell of vertebrate blood?

  1. Thrombocyte

  2. Monocyte

  3. Erythrocyte

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

Monocytes are the largest white blood cells (leukocytes) in vertebrate blood. They are highly phagocytic and can migrate out of blood vessels into tissues to become macrophages, where they engulf pathogens and cellular debris. Thrombocytes (platelets) are cell fragments involved in clotting, erythrocytes (RBCs) carry oxygen, and amoebocytes are invertebrate defense cells.

Multiple choice

Lymph and blood are

  1. connective tissues

  2. fibrous connective tissues

  3. skeletal connective tissues

  4. vascular connective tissues

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

They are mobile connective tissues consisting of cell fluid matrix without fibres.

Multiple choice

What is haemopoisis?

  1. The process of formation of blood

  2. The process of formation of haemoglobin-containing erythrocytes

  3. The estimation of haemoglobin

  4. The process of formation of heme-protein

  5. The fear of blood
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The process of formation of blood is called haemopoisis.

Multiple choice

Strongly immunogenic tumors appear

  1. in virtually all cancers

  2. only in lymphoma and leukemia

  3. only in experimental animals

  4. only in elderly patients

  5. in immunosuppressed patients
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Strongly immunogenic tumors appears in immunosuppressed patients. For example, certain types of skin cancer and lymphoma seen in transplant patients receiving immunosuppression.

Multiple choice

Which among the following statements doesnot characterises chronic lymphocytic leukemia?

  1. It usually has a very poor prognosis.

  2. It has a good prognosis only in those patients with circulating monoclonal immunoglobulin.

  3. It is mostly a disease of childhood.

  4. It is usually found in people over 50 years of age.

  5. It is a leukemia where both kappa and lambda light chains are found on the surface of the malignant cell.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CLL is uncommon in people under 50 years of age.