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Fermentation: necessary to taste cheese or yogurt. Helpful bacteria are responsible for the acidity in beer. Streptococcus bacteria: one of the harmful bacteria that may cause disease in humans. They cause some small infections like strep throat and pneumonia. Some harmful streptococci may even cause death. Highly contagious and can spread through air. Salmonella bacteria: causes much of the food poisoning in the world • Live in oxygen free environments • Live in extreme conditions – Deep ocean hydrothermal vents – Swamps – Sea-water evaporating ponds • They can live there because of the lipids in their cell membranes of archaebacteria, the composition of their cell walls, and the sequence of nucleic acids in their ribosomal RNA. • Yes, because some types of bacteria can be very harmful to us and cause diseases but other kinds of bacteria cure teeth decay, and help us function daily. • Bacteria are the microscopic organisms whose single cells have neither a membrane bounded nucleus nor other membrane-bounded organelles like mitochondria and chloroplasts. • Bacteria are among the oldest living organisms on Earth. • We could not live without some types of bacteria. • Some bacteria is helpful to humans. You can find them in your toothpaste, deodorant, and gum.