Chapter 27, Problem 6R

Summary Introduction

To review:

The symbiotic relationship of cyanobacteria, mycorrhizae, Rhizobium and Frankia with their respective hosts.

Introduction:

In a symbiotic relationship, both organisms associating with each other are mutually benefitted. Nitrogen-fixing bacteria provide nitrogen, which is essential for organisms in amino acid synthesis, and in return the host provides a habitat; an anaerobic condition and nutrients necessary for bacterial growth. The process which is involved in the conversion of atmospheric nitrogen into ammonia is known as nitrogen fixation. The reaction is catalyzed by an oxygen-sensitive nitrogenase enzyme.