Across
- 2. variable changed in controlled experiment
- 4. molecules with many monomers; makes up macromolecules
- 7. possible explanation for an observation
- 10. compound with an amino group and carboxyl group on opposite ends
- 11. dissolving substance in solution
- 12. weak attraction between hydrogen atom and another atom
- 15. speeds up rate of chemical reactions
- 18. variable that changes because of changed independent variable
- 21. form of an element with same amount of protons, but different amount of neutrons
- 22. group without independent variable-for comparison
- 25. energy for the reaction to start
- 27. what goes into a chemical reaction
- 31. reactant of enzyme-catalyzed reactions
- 33. "educated guess" using previous knowledge
- 35. pure substance with one atom type
- 36. chemical reactions where organisms build up or break down materials
- 37. structure in cells containing genetic info (DNA)
- 40. atom with a + or - charge
- 41. compound that prevents sharp, sudden pH changes
- 42. single parent creates offspring that is genetitcally idententical to it
- 43. info from observing
- 44. 2 or more elements chemically combined
- 45. explanation coming from observation and hypotheses that is well tested and used by scientists
- 49. noticing and describing
- 52. what is produced by chemical reactions
- 53. compound made of C, H, and O atoms; main source of body's energy
- 54. macromolecule made of C and H atoms; fats, oils, waxes
- 55. attraction between different molecules
Down
- 1. process that changes chemicals into different chemicals
- 3. macromolecules with H, O, N, C, P
- 5. mixture with all components evenly distributed
- 6. study of life
- 8. chemical bond formed when electrons are transferred
- 9. signals to organisms
- 13. protein catalyst that speeds up rate of biological reactions
- 14. slight attraction between oppositely charged regions of molecules
- 16. compound producing OH- in solution; pH more than 7
- 17. smallest chemical unit that makes up a polymer
- 19. 0-14; measures concentration of H+ ions in solution
- 20. change over time
- 23. personal opinion
- 24. cells from 2 parents unite to form a new cell
- 26. 1 variable is changed
- 28. compound producing H+ in solution; pH less than 7
- 29. smallest unit of compound that displays all properties of it
- 30. attraction between same substances
- 32. mixture of water and no dissolved material
- 34. basic unit of matter
- 38. bond between atoms where atoms are shared
- 39. negative charge, surrounds nucleus
- 46. internal physical and chemical conditions that organisms maintain
- 47. composed of two or more elements or compounds not chemically combined
- 48. substance dissolved in solution
- 50. genetic material inherited from parents
- 51. macromolecule with C, H, O, N; needed for growth and repair