Discuss charactenst1cs of two classes of Proteobacteria focusing on the following subheadings 15 a) Cell morphology...
Discuss charactenst1cs of two classes of Proteobacteria focusing on the following subheadings 15
a) Cell morphology
b) Oxygen requirement
c) Habitat
Homework Answers
1. Alpha proteobacteria
They are rod, cocci, spiral shape bacteria.
These are Nitrogen-fixing bacteria so they don't require
oxygen.
Habitat - Azospirillum live near outer rhizophere of tropical
grasses such as sugar cane and Rhizobium enters the roots of
legumes and form gall bladder. These bacteria converts atmospheric
nitrogen to ammonia it is used by plants.
2. Epsilonproteobacteria
Helicobacter - Helical shape
It require very little levels of oxygen to survive.
Habitat - It found in hydrothermal vents and cold seep
habitats.
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