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 statements is true about white blood corpuscles?

  1. They are biconcave and enucleated.

  2. They are smaller and fewer than the red blood corpuscles.

  3. They have a life span so small as 3-4 weeks.

  4. They undergo diapedesis to squeeze out of the capillaries.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Diapedesis is the amoeboid movement, which is a characteristic of white blood corpuscles.

Multiple choice

_________ carry/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

All the information about an organism, i.e. its morphology, colour, traits etc. depends upon the nature of proteins in its cells. The proteins are synthesized in the cells under the directions of DNA. Thus, DNA contains all the information. RBC's, WBC's and platelets are merely components of blood and their formation and role is also guided by DNA.

Multiple choice

Blood gets its colour from

  1. platelets

  2. haemoglobin

  3. plasma

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

Haemoglobin is an iron-containing protein in red blood cells that transports oxygen and gives blood its characteristic red colour.

Multiple choice

Which blood group is called as universal donor?

  1. AB

  2. O +ve

  3. A

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

Blood group O negative (O-) is the universal donor because it lacks A, B, and Rh antigens. While O+ is often cited in simplified contexts, O- is the true universal donor.

Multiple choice

A universal receiver can receive blood from group

  1. A

  2. B

  3. O

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Individuals with blood type AB are considered universal recipients because they can receive blood from any ABO blood group. The option 'all of these' is technically correct in the context of the choices provided, as an AB recipient can accept A, B, or O blood.

Multiple choice

Which among the following types of cells are best known to be involved in the initial presentation of antigen to T lymphocytes in a human blood?

  1. Dendritic cells

  2. Plasma cells

  3. Neutrophil polymorphonuclear leucocytes

  4. Erythrocytes

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

Dendritic cells are professional antigen processing cells. They have a number of receptors that enhance the uptake of antigens, and they are specialized to convert these antigens into MHC-peptide complexes that can be recognized by lymphocytes. There are several types of dendritic cells, well distributed over the body.

Multiple choice

Which of the following is a true statement about chronic urticaria?

  1. It must be present for at least 3 weeks.

  2. It is commonly due to urticarial vasculitis.

  3. It can be triggered by IgE antibodies to aspirin.

  4. It can be associated with autoantibodies to Fc epsilon RI.

  5. Systemic steroids are usually required to suppress attacks.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The rash can affect any area of skin. Small raised areas called weals (or wheals) develop on the skin. The weals look like mild blisters and are itchy. It is associated with autoantibodies to Fc epsilon RI.