Microbe Crossword Puzzle

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Across
  1. 2. Planktonic unicellular organisms
  2. 7. Planktonic marine protozoans that secrete glass skeletons
  3. 12. Star-shaped internal skeleton made of silica
  4. 15. Obtain energy from organic matter by respiration
  5. 17. Protozoans with hair-like cilia for locomotion and feeding
  6. 18. Derive energy form chemical compounds, not light
  7. 19. Known as blue-green algae, important for producing O2
  8. 20. Contain chlorophyll or other photosynthetic compounds
Down
  1. 1. Mostly aquatic and mostly photosynthetic (do not leave a space between the words)
  2. 3. Smallest of true living organisms and oldest forms of life
  3. 4. Make own organic compounds
  4. 5. Marine protozoans with calcium carbonate shell
  5. 6. Enclosed in cell walls made of silica - asexual reproduction
  6. 8. Massive calcareous mounds formed by Cyanobacteria
  7. 9. Simplest, most primitive life forms - small, spherical, spiral, or rod-shaped cells
  8. 10. Flagellated, spherical cells of calcium carbonate
  9. 11. Reproduce by infecting living cells
  10. 13. Converting gaseous Nitrogen (N2) to ammonium (NH4+1) do not leave a space between the words
  11. 14. Structurally simple, Eukaryotic organism
  12. 16. Found everywhere and on almost every surface