The Origins of Life and Bacteria
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Questions and Answers

_______ were the first forms of life on earth

Prokaryotes

Which of the following is a characteristic of gram-positive bacteria?

  • They have an outer membrane
  • They have a thick peptidoglycan layer in their cell wall (correct)
  • They have flagella for movement
  • They have a thin peptidoglycan layer in their cell wall

    • Which of the following is a characteristic of gram-negative bacteria?

  • They have a thick peptidoglycan layer in their cell wall
  • They have flagella for movement
  • They have a thin peptidoglycan layer in their cell wall
  • They have an outer membrane (correct)

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