Immunity | Biology | Target Mdcat 2025

Question 1

Which cells directly kill virus-infected or cancerous cells?

Platelets

Cytotoxic T-cells

Antigens

Red blood cells

Question 2

For which purpose are myeloma cells used in monoclonal antibody production?

Increased rate of cell division

Immunization with antigen

To avoid contamination

As nutrients in media

Question 3

The protein that helps other cells resist viral infection is:

Penicillin

Histamine

Interferon

Antigens

Question 4

The cells which play a very important role in developing immunity are:

Monocytes

Neutrophils

Thrombocytes

Lymphocytes

Question 5

Autoimmune diseases act on the principle of:

Self against antigens

Antigens against self

Self against self

Antigen self-destroyed

Question 6

B-lymphocytes are named due to their relationship with:

Blood

Bursa of Fabricius

Bone marrow

Bile duct

Question 7

Antibodies in blood and lymph provide:

Cell-mediated immunity

Hormonal immunity

Humoral immunity

Phototactic immunity

Question 8

Response of body against the transplanted organ is:

Homeostatic response

Behavioral response

Primary response

Cell-mediated response

Question 9

An antibody molecule is made up of ______ polypeptide chains.

Eight

Four

Six

Two

Question 10

Which cells survive for a few days and secrete a huge number of antibodies?

Memory cells

B-lymphocytes

T-lymphocytes

Plasma cells

Question 11

Snake antivenom injection is an example of:

Active immunity

Natural active immunity

Passive immunity

Vaccination

Question 12

Vaccination is a type of:

Passive immunity

Autoimmune response

Active immunity

Natural immunity

Question 13

Polio vaccine contains ______ to make a child immune.

Antisera

Antibodies

Antibiotics

Antigens

Question 14

Which enzyme is administered to patients with Severe Combined Immunodeficiency Disease (SCID)?

Pancreatic enzyme

Adenosine Deaminase (ADA)

β-galactosidase

None of the above

Question 15

A person got an infection, became ill, but then survived. What type of immunity did he develop?

Naturally induced active immunity

Artificially induced active immunity

Passive immunity

Innate immunity

Question 16

Antibodies are:

Primary proteins

Secondary proteins

Tertiary proteins

Quaternary proteins

Question 17

Vaccination can be done against:

Bacterial diseases only

Viral diseases only

Both viral and bacterial

All types of disease-causing organisms

Question 18

Antibodies are not present in:

Blood

Lymph

Plasma

Saliva

Question 19

The immunity acquired by inoculation of living organisms of attenuated virulence is:

Artificial active immunity

Passive immunity

Natural active immunity

Local immunity

Question 20

Antitoxin is used for ____ immunization.

Active

Passive

Both a and b

None of these

Question 21

Natural killer cells:

Belong to B-cell lineage

Belong to T-cell lineage

Display cytotoxic effect on tumor cells

Require previous antigen exposure for activation

Question 22

Immunoglobulin associated with anaphylactic delayed hypersensitivity reaction is:

IgE

IgA

IgD

IgM

Question 23

What does cytotoxicity refer to?

The ability to produce antibodies

The ability to kill target cells

The ability to help in phagocytosis

The ability to prevent infections

Question 24

Which cell acts on both 2nd and 3rd line of defense?

Neutrophils

B lymphocytes

T lymphocytes

Macrophages

Question 25

Which cell activates dendritic cells?

Neutrophils

Lymphocytes

NK cells

Macrophages