Across
- 3. a molecule that can be bonded to other identical molecules to form a polymer.
- 5. the description of an observed phenomenon.
- 9. a substance produced by a living organism which acts as a catalyst
- 13. any of the class of sugars
- 14. Study of life.
- 15. a compound consisting of a nucleoside linked to a phosphate group
- 17. a substance that has a molecular structure consisting chiefly or entirely of a large number of similar units bonded together
- 18. a weak bond between two molecules
- 21. devoid of life
Down
- 1. a lipid containing a phosphate group in its molecule
- 2. a simple organic compound containing both a carboxyl (—COOH) and an amino
- 4. relating to or resulting from living things
- 6. a complex organic substance present in living cells
- 7. a carefully thought-out explanation.
- 8. to actively maintain fairly stable conditions necessary for survival
- 10. a carbohydrate
- 11. a chemical bond that involves the sharing of electron pairs
- 12. a small structural and functional unit of an organism
- 16. a supposition or proposed explanation.
- 19. a simple sugar which is an important energy source in living organisms
- 20. any of a class of organic compounds that are fatty acids