A2.1 - Crossword Labs

2. The gas that was largely absent from Earth's early reducing atmosphere.
6. The theory that mitochondria and chloroplasts evolved from free-living prokaryotes.
9. The process of life arising from non-living matter.
12. One of the four requirements for the origin of cells, often involving RNA.
15. The process that led to the diversification of early cells.
17. The molecule thought to be the first self-replicating genetic material.
18. Hydrothermal locations on the ocean floor that may have provided energy for early life.
19. Organelle that originated as a photosynthetic bacterium taken up by a host cell.

1. Evidence for endosymbiosis found surrounding mitochondria and chloroplasts.
3. The full name for LUCA, the shared ancestor of all extant life.
4. The famous experiment that synthesized amino acids from inorganic compounds.
5. The type of "generation" that Pasteur disproved with his swan-neck flask experiment.
7. Organelle that originated as an aerobic bacterium taken up by a host cell.
8. Simple gases like methane and ammonia used to create organic precursors.
10. The size of ribosomes found in prokaryotes and mitochondria.
11. The method of division used by both bacteria and mitochondria.
13. An RNA molecule that can act as an enzyme.
14. The process of linking monomers into complex organic polymers.
16. Spherical droplets of lipids that could have formed the first cell membranes.