Question

Bacteriology Multiple Choice. Thank You!

16) The bodyʹs non-inducible, preexisting ability to recognize and destroy a variety of pathogens or their products is called

A) adaptive immunity.

B) innate immunity.

C) phagocytosis.

D) cytotoxic response.

17) Adaptive immune responses are directed at pathogen molecules called

A) antigens.

B) antibodies.

C) T-cell receptors.

D) PAMP.

18) The cells active in both innate and adaptive immunity develop from common pluripotent precursors in the bone marrow called

A) B cells.

B) killer cells.

C) stem cells.

D) leukocytes.

19) The first defense cells that interact with a pathogen in the body are

A) T cells.

B) macrophages.

C) B cells.

D) mast cells.

20) Communication between cells of the immune system is accomplished in many cases through

A) allelic exclusion.

B) clonal deletion.

C) cytokines.

D) aliens

Answer 1

Question 16

Answer: Innate immunity is a natural, non-inducible and pre-existing immune response that recognizes and destroys all the pathogens such as Viruses and bacteria by either anatomical barriers or by recruiting immune cells and producing complement proteins. Hence, option B is the correct answer. Adaptive immunity is a acquired immunity that is produced after pathogen Infection. This type of immunity is specific for a particular pathogen. Phagocytosis and cytotoxic response are immune response that are induced by both innate and adaptive immunity. Hence, options A, C and D are incorrect.

Question 17

Answer: Antigens are the pathogen molecules that elicit adaptive immune response. Hence, option A is the correct answer. Antibodies and T-cells receptor are not the molecules of the pathogen. Antibodies are produced by B-cells in response to antigen and T- cells receptor recognizes antigens and are found on the T- cells. Hence, options B and C are incorrect. Pathogen associated molecular patterns are associated with innate immunity. Hence, option D is incorrect.