Topic 1.5 Origin of Cells

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Across
  1. 1. Evidence for endosymbiosis where prokaryote engulfed and enclosed in vacuole but not digested by engulfing cell
  2. 3. Domain of unicellular prokaryotes that have cell walls that do not contain peptidoglycan
  3. 8. generation the mistaken idea that living things can arise from nonliving sources
  4. 9. Scientist who proposed the endosymbiotic theory
  5. 10. Last Eukaryotic Common Ancestor - early type of eukaryotic cell which included mitochondria and gave rise to all eukaryotes
  6. 11. The theory that life can only arise from life
  7. 13. Domain of unicellular prokaryotes whose cell walls are made up of peptidoglycan
  8. 14. _________ Flasks apparatus used by Pasteur which prevented growth of bacteria in a sterile broth
  9. 16. Non-membrane bound organelles – smaller form found in mitochondria and chloroplasts providing one strand of evidence for endosymbiotic theory
  10. 17. ___________atmosphere Hypothesised early atmosphere that suggests that the atmosphere was mainly composed of the gases methane, ammonia, hydrogen, water vapour and very little oxygen.
Down
  1. 2. The last universal common ancestor of cells. This theoretical entity is proposed to be the product of chemical evolution and provided characteristics of life that are shared by all living organisms on Earth today.
  2. 4. hypothesis that RNA was the first nucleic acid to evolve and that early life was based on RNA, rather than DNA or protein
  3. 5. a mutually beneficial relationship in which one organism lives within another
  4. 6. The idea that long ago, very simple life forms spontaneously appeared through chemical reactions.
  5. 7. Theory that life was seeded on earth and other planets from outer space
  6. 12. French scientist who disproved spontaneous generation
  7. 15. Prokaryotic type DNA found in mitochondria and chloroplasts providing one strand of evidence for endosymbiotic theory