j's biology puzzle

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Across
  1. 3. Hard to digest and strong
  2. 7. Aerobic respiration occurs in it
  3. 8. Appears darker under micrographs
  4. 9. Folds of the endoplasmic reticulum
  5. 12. Helps attach prokaryotic cells to stuff
  6. 15. Temporary in animal cell permanent in plant cell
  7. 18. Release of material
  8. 19. Main function is transport
Down
  1. 1. "Often mistaken for pili" - Mr Oisin
  2. 2. Tail
  3. 4. Absorbing solid into cell
  4. 5. Start of protein synthesis
  5. 6. Folds of mitochondria
  6. 10. Next to nucleus
  7. 11. Bigger in eukaryotic cells
  8. 13. Circularly represented
  9. 14. Floppy; can be used to describe plants
  10. 16. Final destination in protein production
  11. 17. Present in flagellum