Across
- 2. a form of kinetic energy used by life
- 5. have branched chain fatty acids
- 6. used by all Earth life
- 11. same number of protons but not neutrons
- 12. type of rock deposited in sequential layers
- 13. made of amino acids
- 14. were depleted in iron before the rise of oxygen
- 15. not alive, according to NASA's definition
- 18. membrane components of eukaryotes
- 21. introduce new traits to populations
- 24. heaviest element typically produced in stars
- 25. chemical reaction in which electrons are lost
- 26. durable grains that can help us reconstruct earth history
- 30. resulted in the Earth's internal layering
- 31. type of reproduction involving binary fission
- 32. component of nucleic acids
- 33. outside of some cells
- 36. cyanobacterial metabolism
- 37. enzyme that breaks the N triple bond
- 38. unlikely to have unsaturated fatty acids
- 39. not-so-hellish period of Earth's history?
- 40. can form diverse minerals with oxygen
- 41. a mineral that readily reacts with oxygen to produce acid
Down
- 1. live in rocks
- 3. metabolic breakdown of molecules, releasing energy
- 4. the product of H burning in stars
- 7. cyanobacteria cells that fix N instead of C
- 8. a heterotrophic metabolism
- 9. drove an explosion of biodiversity
- 10. the rise of oxygen
- 16. may have high intracellular glucose levels
- 17. elements of life
- 19. using only a specific enantiomer
- 20. reduction of NO3 to N2
- 22. animal that can enter suspended animation
- 23. lowers freezing temperature
- 25. a requirement for complex life
- 27. transfer of life between celestial bodies
- 28. the compartment of life
- 29. energy storage molecules
- 34. component of membranes, nucleic acids, and ATP
- 35. single-stranded nucleic acid