Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

Cell-mediated responses are most effective against ______.

  1. a. intracellular pathogens
  2. b. extracellular pathogens
  3. c. cancerous cells
  4. d. both a and c

Summary Introduction

Concept introduction: Cell-mediated immunity is an immune response that involves the activation of the phagocytes, antigen-sensitized cytotoxic T cells, and the release of chemokines and cytokines in response to the antigen. It does not involve in the activation of the antibodies. Cellular immunity protects the body by T-cell immunity.


Reasons for correct answer:

Cell-mediated immunity is aimed at primarily to the microbes in phagocytes and the microbes that infect the non-phagocytic cells. It is most effective in eradicating the virus-infected cells and also participates in removing fungi, protozoans, cancerous cells, and the intracellular bacteria.

Option d. is given as “both a and c”. As cell-mediated immune response are most effective e against intracellular pathogens and cancerous cells option d. is correct.

Reason for incorrect answer:

Option a. is given as “intracellular pathogens”.

Cell-mediated immune responses are effective against intracellular pathogens but also it is active against cancerous cells...

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