Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

When a person’s immune system resists infection by a pathogen after being vaccinated against it, this is the result of:

innate immunity.

immunological memory.

a response with defensins.

an autoimmune reaction.

systemic inflammation

Summary Introduction


Immune system is the defense system of an organism, which consists of various biological processes and structures protecting them against various pathogens. Immunological memory is the capacity of immune system to rapidly and exclusively recognize the antigen, which the body has encountered earlier and start a consequent immune response.


Justification for the correct answer:

Option (b) is immunological memory. This is a true statement as the immunological memory is the reason for adaptive constituent of immune response, the memory B and T cells, which is the foundation of vaccination. Hence, option (b) is correct.

Justification for the incorrect answers:

Option (a) is innate immunity. This is false as innate immunity is a part of the vertebrate’s immune response. Pathogens that enter the host body first encounter the components of innate immune system. So, it is an incorrect option.

Option (c) is response with defensins. This is false as defensins are vertebrate proteins, which act as the host protective peptides...

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