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

Antibody-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: Antibody-mediated responses or humoral-mediated response involves the B cells that can recognize the antigens or the pathogens that are circulating in lymph or blood. When an antigen encounters the cell, the B-lymphocytes are activated and differentiated to form the plasma cells. Plasma cells are the specialized, differentiated cells that can produce and secrete the antibodies specific for an antigen.


Reasons for correct answer:

Humoral immunity is the type of immunity that is mediated by macromolecules found in the extracellular body fluids. Antibodies will protect against the bacteria that multiply outside the cells by helping the uptake of pathogen by phagocytic cells that are focused to destroy ingested bacteria.

Option b. is given as “extracellular pathogens”. As the humoral immune response is effective against extracellular pathogens, option b. is correct.

Reason for incorrect answer:

Option a. is given as “intracellular pathogens”.

Cell-mediated immunity provides protection against the intracellular bacteria...

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