Gas Exchange

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Across
  1. 3. nitrogenase and photosynthesis separated in time
  2. 7. gas exchange surfaces in lungs
  3. 8. readily available atoms necessary for life
  4. 9. lowering pH makes hemoglobin release more oxygen
  5. 11. enzyme to convert carbon dioxide into bicarbonate and H+ ions
  6. 12. photorespiration occurs on this enzyme if oxygen binds
  7. 13. enzyme that fixes nitrogen gas
  8. 14. diatomic oxygen is highly reactive
  9. 15. animals with highly efficient lungs, no mixing or dead space
Down
  1. 1. helps protect cells from reactive oxygen species
  2. 2. carbon concentrating mechanism of cyanobacteria
  3. 4. oxygen storage protein with heme
  4. 5. nitrogenase and photosynthesis separated in space
  5. 6. oxygen transport protein with heme
  6. 10. allowed for evolution of aerobic respiration