Question

1. Which of the following would NOT be an example of a physical barrier? a. Ciliated epithelial cells in the lung airways b. Histatins expressed in the saliva C. Many layers of skin cells, including dead cells at the surface. d. Mucous covering intestinal epithelial cells 2. True or False: Secondary lymphoid organs are specialized structures where adaptive immune cells are activated. a. True b. False 3. Which of the following is NOT a role of the innate immune response? a. Provide early control of pathogen burden b. Activate the adaptive immune response C. Establish long-lived memory cells following vaccination d. Detect infections and induce inflammation 4. B cells develop in the (a) _ and mature in the (b). whereas T cells develop in the (c) and mature in the (d) 5. T and B cells have antigen specificity against a particular pathogen because they: a. Express major histocompatibility complex class I and II b. Can produce cytokines and chemokines C. Become activated in primary lymphoid organs d. Have unique receptors, the TCR and BCR

Answer 1

Q.1. Answer:- The following option is not an example of physical barrier ----

option b) Histatin expressed in the saliva .

Reason:- Physical barrier are the parts of the body which prevents microbes to infect cellular tissues or organelles.

Physical barrier include ciliated epithilial cell in lung airways, dead cells at surface of skin, mucous covering intestinal cell wall etc.

Q.2 Answer:--- option a) True.

Reason:- Secondary lymphoid organs are the site which facilitate an environment for the cells responsible for adaptive immmunue response to proliferate and mature so that cell become mature and active to perform adaptive immune response.

Q.4.Answer:- B cells develop in the (a) bone marrow and mature in( b) spleen   and T cells develop in the (c) bone marrow and mature in (d)thymus.