Biology 19.2

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Across
  1. 2. sterilization does this to bacteria
  2. 4. type of relationships between soybeans and Rhizobium nodules
  3. 7. slows down the growth of bacteria
  4. 8. discovered penicillin
  5. 9. amino acids need this element
  6. 10. acids building blocks of proteins
  7. 13. these produce antibodies when injected into the human body
  8. 14. this device sterilizes using great heat and great pressure
Down
  1. 1. the killing of bacteria through the use of chemicals
  2. 2. these recycle nutrients
  3. 3. the process where nitrogen is changed into ammonia
  4. 5. these block the growth and reproduction of bacteria
  5. 6. developed germ theory
  6. 11. human waste, discarded food & chemical waste are collectively known as this
  7. 12. the type of bacteria in our intestines