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 property of erythrocytes?

  1. In most mamals, they are devoid of nucleus.

  2. They have a red-coloured iron containing protein.

  3. They have an average life-span of 120 days.

  4. They are biconcave in shape.

  5. They are produced from megakaryocytes.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this is not a property of erythrocytes. In adults, erythrocytes are produced in the red bone marrow.

Multiple choice

Which of the following is not a property of the lymph?

  1. It is a carrier of hormones.

  2. It contains lymphocytes that are responsible for the immune response of the body.

  3. Calcium ions present in it play a very important role in clotting of blood.

  4. It is an important carrier of nutrients.

  5. Fats are absorbed through it.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as this is not a property of lymph. Lymph does not have calcium ions in it.

Multiple choice

Which of the following statements is/are false?

a. An 'O' blood group person is a universal donor as group 'O' blood can be donated to persons with any other blood group. b. Blood normally contains 1,500,00-3,500,00 platelets mm–3. c. Basophils are the most abundant cells of the total WBCs and neutrophils are the least.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this statement is false.

Multiple choice

Antibodies are also called as

  1. immunoglobulin

  2. protamines

  3. albumin

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

An antibody, also known as an immunoglobulin, is a large Y-shaped protein produced by B-cells that is used by the immune system to identify and neutralize foreign objects such as bacteria and viruses.

Multiple choice

Which of the following is an immunogen?

  1. Penicillin

  2. Progesterone

  3. Aspirin

  4. Insulin

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

Molecular weight of insulin is more than 1000 daltons. So, it is immunogenic.

Multiple choice

Immunoblot is another name of

  1. northern blot

  2. southern blot

  3. western blot

  4. eastern blot

  5. northwestern blot
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The western blot (also known as immunoblot) is used to detect specific proteins in a given sample of tissue homogenate or extract. The method was invented and named by W. Neal Burnette.

Multiple choice

Which type of skin cells act as antigen presenting cells (APC) on infection with a microbe?

  1. Keratinocytes

  2. Langerhans cells

  3. Merkel cells

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

Langerhans cells act as APC on infection with a microbe. Langerhans cells break the allergen into smaller pieces and then migrate from the epidermis into the dermis. They find their way to lymphatic and blood vessels before eventually reaching the lymph nodes. Here they present the allergen to immune cells called lymphocytes.

Multiple choice

Carbonic anhydrase is found in __________.

  1. leucocytes

  2. lymphocytes

  3. blood plasma

  4. erythrocytes

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

Red blod cells contains carbonic anhydrase enzyme which brings the rapid interconversion of carbon dioxide and water to bicarbonate and hydrogen ions(or vice versa), a reversible reaction  that occurs rather slowly in the absence of a catalyst.

Multiple choice

Which immunoglobulin class is only found in mammals?

  1. IgA

  2. IgG

  3. IgM

  4. IgD

  5. IgE

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Immunoglobulin E is a class of antibody (or immunoglobulin (Ig) isotype) that has been found only in mammals. IgE is the least abundant isotype of all antibodies but it is capable of triggering the most powerful immune reactions.