Biology Crossword

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Across
  1. 3. Element or compound produced by a chemical reaction.
  2. 4. Organism whose cells that contain nuclei
  3. 8. Material inside the cell membrane.
  4. 9. Center of an atom that contains the protons and neutrons
  5. 10. Compounds made of carbon, hydrogen, and oxygen atoms.
  6. 12. Granular material visible within the nucleus
  7. 13. Cell organelle that converts the chemical energy in food into compounds for cells to use.
  8. 15. Thin, flexible barrier around the cell.
  9. 18. Unicellular organism lacking a nucleus.
  10. 19. The basic unit of matter
  11. 21. Proteins that act as biological catalysts.
  12. 22. Single sugar molecules.
  13. 24. Mixture of 2 or more substances in which the molecules are evenly distributed.
  14. 25. Atoms of the same element that differ in the number of neutrons.
  15. 28. Monomer of nucleic acid made of a 5-carbon sugar, phosphate group and nitrogen base.
  16. 30. Weak acids or bases that react with strong acids to prevent sudden changes in pH.
  17. 31. One of two identical sister parts of a duplicated chromosome.
  18. 33. The smallest unit of most compounds.
  19. 34. A pure substance that consists entirely of one type of atom.
  20. 35. A compound that produces hydroxide ions in solution.
  21. 36. Organelle found in plants that captures energy from sunlight.
  22. 38. Macromolecule made mainly from carbon and hydrogen atoms.
  23. 40. Small unit that joins together to form a polymer.
  24. 41. Small particle in the cell on which proteins are assembled.
  25. 42. One of two tiny structures located in the cytoplasm of animal cells.
  26. 43. Reactant of enzyme-catalyzed reaction.
Down
  1. 1. Substance in which solute dissolves.
  2. 2. Any compound that forms H+ ions in solution.
  3. 4. Internal membrane system in cells.
  4. 5. Cell organelle filled with enzymes needed to break down certain materials in cell.
  5. 6. Sequence of DNA that codes for a protein and thus determines a trait.
  6. 7. Mixture of water and nondissolved material.
  7. 8. An attraction between molecules of the same substance.
  8. 11. Large macromolecule formed from monosaccharides.
  9. 14. Macromolecules that contain nitrogen, carbon, hydrogen and oxygen.
  10. 16. An attraction between molecules of different substances.
  11. 17. Element or compound entering a chemical reaction.
  12. 18. Compound formed from combination of many monomers.
  13. 20. The basic unit of all forms of life.
  14. 22. Material composed of 2 or more elements or compound that not chemically combined.
  15. 23. Organisms that obtain energy from the food they consume.
  16. 26. Substance that is dissolved.
  17. 27. A substance that speeds up the rate of a chemical reaction.
  18. 29. A negatively charged particle.
  19. 31. Strong supportive layer around the cell membrane in plants.
  20. 32. Cell organelle that stores materials.
  21. 36. Threadlike structure within the nucleus containing the genetic information.
  22. 37. Organisms that make their own food.
  23. 39. Positively or negatively charged atoms.