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5 Cards in this Set

  • Front
  • Back
It has been estimated that there are how many different species of bacteria on earth?
10 million to 1 billion

5x10^30 bacterial cells on earth
How many different bacterial species are in the normal flora of the mouth?
400-500
How many different bacterial species are in the normal flora of the GI tract?
300-1000 different species in GI tract
How many different bacterial species are in the normal flora on the skin?
>1000 different species on skin
Of the estimated 10 million – 1 billion bacterial species on earth, how many species are strict human pathogens?
less than 100