Biology crossword puzzle

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Across
  1. 2. smallest unit of most compounds
  2. 4. basic unit of matter
  3. 6. educated guess
  4. 7. atoms of the same element that differ in the number of neutrons they contain
  5. 9. organized way of using evidence to learn about the natural world
  6. 10. any compound that makes up H+ ions in solution
  7. 11. the process of gathering information about events in an orderly way
  8. 14. indicates the concentration of H+ ions in a solution
  9. 15. positive and negative charged atoms
  10. 18. small particles of RNA and protien
  11. 20. small organelles filled with enzymes
  12. 22. help for growth and repair
  13. 24. a mixture of one or more solutes dissolved in a solvent
  14. 25. control center of the cell
  15. 26. pure substance that consits of one type of atom
  16. 27. the substance being dissolved
  17. 29. substance formed by the combination of two or more elements
  18. 33. stores water and food
  19. 35. a group of similar cells that perform a particular function
  20. 37. diffusion of water
  21. 39. the science that employs the scientific method to study living things
  22. 40. when electrons are shared between atoms
  23. 41. the information gathered from observations
  24. 42. change food into energy
  25. 43. portion of the cell outside the nucleus
Down
  1. 1. make up RNA and DNA
  2. 3. make up sugars and starches
  3. 5. a process that changes ar transfers one set of chemicals into another
  4. 8. little organs
  5. 12. capture sunlight and turn it into energy
  6. 13. means above strength
  7. 16. many groups of tissue that work together
  8. 17. where particles move from high to low
  9. 19. fats, oils and waxes
  10. 21. smallest unit of life
  11. 23. the tendency toward a realitively stable equlibruim
  12. 28. a state in which opposing forces are balanced
  13. 30. also known as the plasma membrane
  14. 31. negative charge
  15. 32. means below strength
  16. 34. a strong supporting layer around the cell membrane
  17. 36. means same strength
  18. 38. the substance in which the solute disolves