Across
- 3. The information gathered from observations
- 4. Evidence from numerous investigations build up a particular hypothesis and may be well supported
- 8. Positively and negatively charged atoms
- 10. Compounds made up of carbon, hydrogen, and oxygen atoms
- 13. Negatively charged particle with 1/1840, the mass of a proton
- 16. The study of chemistry begins with the basic unit of matter
- 17. Cells that contain a nuclei
- 19. Reactants of enzyme-catalyzed reactions
- 21. Cells that do not contain a nuclei
- 22. Plants use the energy of sunlight to convert water and carbon dioxide into high-energy carbohydrates
- 23. Any compound that forms H+ ions in solution
- 24. Exchange portions of their chromatids
- 26. Cells also produce a strong supporting layer around the membrane
- 28. Pure substance that consists entirely of one type of atom
- 30. Atoms of the same element that diff in the number of neutrons they contain
- 31. Proteins that act as biological catalysts
- 34. Diffusion of water through a selectively permeable membrane
Down
- 1. Compound that produces hydroxide ions OH- in solution
- 2. Substance that speeds up the rate of a chemical reaction
- 5. Energy to get the reaction started
- 6. Surrounded by a thin flexible barrier
- 7. Specialized subunit within a cell that has a specific function
- 8. Are not involved in coding for proteins
- 9. Portion of the cell outside the nucleus
- 11. Forms when electrons are shared between atoms
- 12. A proposed scientific explanation for a set of observations
- 14. Logical interpretation based on prior knowledge
- 15. Formed when one or more electrons are transferred from one atom to another
- 18. Attraction between molecules of different substances
- 20. Is the smallest unit of most compounds
- 25. The final result in a chemical reaction
- 27. Basic units of life
- 29. Attraction between molecules of the same substance
- 32. Strong forces bind protons and neutrons together to form...
- 33. The DNA sequence that code for proteins