Describe the difference between these bacteria, and compare them to one another and to the Anabaena.  What do the three shapes of the bacteria represent the separate taxonomic groups? What is the ecological and economic importance of these bacteria? Are all bacteria harmful?

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Comparing and Contrasting Bacterial Shapes

The bacillus (rod-shaped), spirillum (corkscrew-shaped), and coccus (round).

Describe the difference between these bacteria, and compare them to one another and to the Anabaena. 

What do the three shapes of the bacteria represent the separate taxonomic groups?

What is the ecological and economic importance of these bacteria?

Are all bacteria harmful?

 

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Since there are multiple questions in this particular question, I'll answer the first one for you. If the answers to other questions are intended, please post the questions separately.

Bacteria are a type of biological cell. They constitute a large domain of prokaryotic microorganisms. 

The characteristics are:

  • lack of membrane-bound organelles
  • unicellular
  • small (usually microscopic) size. 
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