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Biology: The Dynamic Science (Mind...

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

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

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

Apply Evolutionary Thinking Defensins are found in a wide range of organisms, including plants as well as animals. What are the evolutionary implications of this observation?

Summary Introduction

To review:

Defensins are found in a wide range of organisms including plants as well as animals. The evolutionary implications of this observation.

Introduction:

Defensins are small antimicrobial peptides rich in cysteine amino acids; produced by both plants and animals. These peptides work against viruses, bacteria and fungi in animals and against fungi in plants. Plant defensins work against animal pathogens along with phytopathogen.

Explanation

The lymphocytes, phagocytic cells, the epithelial cell lining that are present in the gastrointestinal tract and the genitourinary tracts produces defensins. Defensins are produced either constitutively or induced by proinflammatory cytokines and foreign invaders (antigens).

Defensins produced constitutively are not specific and work against all pathogens by disrupting the plasma membrane of the pathogen; in case the pathogen is bacteria then they work as an innate immune response...

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