Chapter 13: Immunology — Online MCQ Test
MICROBIOLOGY · CLASS 11th · Tamil Nadu State Board
Practice Chapter 13: Immunology with a free chapter-wise online MCQ test.
This chapter covers: This chapter details innate and adaptive immunity lymphoid organs antigens antibody structure and immune responses. Students study antigen-antibody interactions hypersensitivity im....
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Chapter 13: Immunology — Important Questions & Answers
Which among the following is considered a primary lymphoid organ?
- A. Spleen
- B. Thymus
- C. Lymph nodes
- D. Tonsils
Answer: B. Thymus
Primary lymphoid organs are sites where lymphocytes develop and mature; the thymus and bone marrow are the primary lymphoid organs.
Primary lymphoid organs are sites where lymphocytes develop and mature; the thymus and bone marrow are the primary lymphoid organs.
Which immunoglobulin is found in maximum concentration in human serum?
- A. IgG
- B. IgA
- C. IgM
- D. IgE
Answer: A. IgG
IgG is the most abundant immunoglobulin in the blood serum, accounting for approximately 75-80% of total antibodies.
IgG is the most abundant immunoglobulin in the blood serum, accounting for approximately 75-80% of total antibodies.
Which of the following is an example of natural passive immunity?
- A. Vaccination with attenuated virus
- B. Injection of antivenom
- C. Transfer of antibodies through placenta
- D. Recovery from an infection
Answer: C. Transfer of antibodies through placenta
Natural passive immunity occurs when antibodies are transferred from mother to fetus across the placenta or via colostrum.
Natural passive immunity occurs when antibodies are transferred from mother to fetus across the placenta or via colostrum.
Consider the structure of an antibody. The antigen-binding site is located at the:
- A. Fc region
- B. Variable region of heavy and light chains
- C. Constant region of heavy chains
- D. Hinge region
Answer: B. Variable region of heavy and light chains
The hypervariable regions (CDRs) located at the amino-terminal ends of the heavy and light chains form the antigen-binding site.
The hypervariable regions (CDRs) located at the amino-terminal ends of the heavy and light chains form the antigen-binding site.
If a patient shows a positive result in an ELISA test for a specific pathogen, this indicates:
- A. The patient is currently immune to all pathogens
- B. The presence of either the specific antigen or antibodies against that pathogen
- C. The patient has failed to produce memory cells
- D. The pathogen has been completely eradicated from the body
Answer: B. The presence of either the specific antigen or antibodies against that pathogen
ELISA (Enzyme-Linked Immunosorbent Assay) is a plate-based assay technique designed for detecting and quantifying soluble substances such as peptides, proteins, antibodies, and hormones.
ELISA (Enzyme-Linked Immunosorbent Assay) is a plate-based assay technique designed for detecting and quantifying soluble substances such as peptides, proteins, antibodies, and hormones.