Which is/are not part of adaptive immunity?

1. a. phagocytic cells
2. b. antigen-presenting cells
3. c. MHC markers
4. d. complement activation
5. e. antigen receptors
6. f. cytokines
7. g. antibodies
8. h. all take part

Concept introduction: Adaptive immunity or acquired immunity is the type of immunity that the body acquires when a pathogen invades our body. Antibody-mediated immune response is an adaptive immune response in which the B cells produce antibodies that bind to an antigen. The cell-mediated immune response is another part of adaptive immunity in which the cytotoxic T cells and NK cells kill the infected or cancerous body cells.

Reasons for correct answer:

Phagocytic cells, complement activation which is included in the innate immunity, are also a part of the adaptive immunity. Tremendous diverse receptors are present in the adaptive immunity. In the adaptive immunity, the cell can distinguish the self-proteins from non-self-proteins by MHC markers.

Option h. is given as “all take part”. As all the options given in the question is a part of the adaptive immunity, option h. is correct.

Reasons for incorrect answer:

Option a. is given as “phagocytic cells”.

WBC cells are phagocytic to some extent. So, it is also a part of the adaptive immunity. Therefore, option a. is incorrect answer.

Option b. is given as “antigen-presenting cells”.

Antigen presenting cells are a part of the adaptive immunity which displays the antigen on their surfaces along with MHC.. Therefore, option b. is incorrect answer.

Option c. is given as “MHC markers”.

MHC markers belong to first line of defense and are also part of adaptive immunity in the antibody and cell-mediated immune response...