This set of Immunology Multiple Choice Questions & Answers (MCQs) focuses on “Anatomical Barriers”.
1. Skin, lysosome secretion and mucus are the _________
a) First line of defence
b) Phagocytes
c) Opsonins
d) Part of adaptive immunity
View Answer
Explanation: Skin, mucus and lysosome secretion are the part of the first line of defence. These are a part of innate immunity. These are called anatomical barriers.
2. Tears, saliva and sweat are called as __________ of immunity system.
a) Physical barriers
b) Chemical barriers
c) Opsonins
d) Chemicals of the body
View Answer
Explanation: The above mentioned secretions of the body are called the chemical barriers of the body. These are a part of the innate immunity system.
3. The third line of defence is a part of innate or nonspecific immunity.
a) True
b) False
View Answer
Explanation: The third line of defence is a part of specific defense. These are the part of the adaptive immune system. These depend or are mediated by antibodies.
4. Which of the following immunoglobulin is involved with mucus membranes?
a) IgA
b) IgG
c) IgE
d) IgD
View Answer
Explanation: IgA prevents the microbes and pathogens from entering and attacking the mucosal cells. This way these pathogens are trapped in the mucus itself.
5. What is the function of the lysozyme present in mucus?
a) Degrade bacterial peptidoglycan
b) Bind to iron
c) To generate toxics
d) Secretes an antibody
View Answer
Explanation: The lysozyme present in the mucus is capable of degrading the bacterial peptidoglycan. This lysozyme is also found in other body fluids having the same or different function.
6. What is the function of lactoferrin present in mucus?
a) Degrade bacterial peptidoglycan
b) Bind to iron
c) To generate toxics
d) Secretes an antibody
View Answer
Explanation: Lactoferrin is a globular glycoprotein. It binds to iron in the mucus to stop the microbes from using it. It is also present in saliva, tears and milk.
7. What is the function of lactoperoxidase present in mucus?
a) Degrade bacterial peptidoglycan
b) Bind to iron
c) To generate toxic superoxide radicals
d) Secretes an antibody
View Answer
Explanation: Lactoperoxidase is an enzyme that is secreted by anatomical barriers. It generates toxic superoxide radicals that can kill microbes.
8. Vomiting, Diarrhea, coughing and sneezing also fall under the first line of defence. True or False?
a) True
b) False
View Answer
Explanation: Yes, all these fall under the category of first line of defence. Vomiting and diarrhea can kill the pathogens and toxins in the intestinal tract. Coughing and sneezing removes trapped pathogens in mucus.
9. Which of the following cells perform their activity as anatomical barrier by passive diffusion and osmosis processes?
a) Endothelial cells
b) Epithelial cells
c) Kupffer cells
d) Defensins
View Answer
Explanation: Endothelial cells are the cells present in the blood-brain barrier. These act as anatomical barriers via passive diffusion and osmosis.
10. Shedding of skin’s epithelial cells in immunity terms is known as__________
a) Degradation
b) Destruction of skin
c) Desquamation
d) Deletion of cells
View Answer
Explanation: Desquamation is the process of shedding of skin’s epithelial cells. This happens in order to remove the infectious agents that might have adhered to the surface of the skin.
Sanfoundry Global Education & Learning Series – Immunology.
To practice all areas of Immunology, here is complete set of 1000+ Multiple Choice Questions and Answers.
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