oxygen requirement in the body can be classified into four major divisions.
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Answer:
Obligate aerobes: They have absolute requirement for oxygen in order to grow. Pseudomonas aeruginosa, Mycobacterium tuberculosis. Anaerobes: Usually bacteria of this group can not grow in the presence of oxygen, oxygen is toxic for them.
Bacteria are the plural of bacterium, which are microscopic one-celled organisms. They are found everywhere and can be harmful, as in infections; or they can be beneficial, as in fermentation or decomposition. Five types of bacteria are: Coccus, Bacillus, Spirillum, Rickettsia, and Mycoplasma.
However different types of bacteria can be distinguished according to a number of characteristics:
Shape – Round (coccus), rod-like (bacillus), comma-shaped (vibrio) or spiral (spirilla / spirochete)
Cell wall composition – Gram-positive (thick peptidoglycan layer) or Gram-negative (lipopolysaccharide layer)