Biology Crossword Puzzle

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Across
  1. 3. proposed scientific explanation for a set of observations
  2. 4. cell is able to reproduce so that a group of cells.
  3. 7. an organized way of using evidence to learn about the natural
  4. 8. a slight attraction can develop between the oppositely charged regions of nearby molecules.
  5. 9. variable that is deliberately changed
  6. 11. the process of gathering information about events or processes in a careful, orderly way.
  7. 13. variable that is observed and that changes in response to the manipulated variable is called _______
  8. 17. cells that do not contain nuclei
  9. 19. amount of energy needed to raise the temperature of a gram of water degree celsius
  10. 20. a pure substance that consists entirely of one type of atom
  11. 21. forms when electrons are shared between atoms
  12. 23. small particles of RNA and protein found throughout the cytoplasm
  13. 24. smallest unit of most compounds
  14. 26. portion of the cell outside the nucleus
  15. 27. region outside of the thylakoid membranes
  16. 28. Bond/ formed when one or more electrons are transferred from one atom to another.
Down
  1. 1. proteins that act as biological catalysts.
  2. 2. plants use high energy of sunlight to convert water and carbon dioxide into high-energy carbohydrates
  3. 3. organisms that obtain energy from foods they consume
  4. 5. the site where lipid components of the cell membrane are assembled, along with proteins and other materials that are exported from the cell
  5. 6. devices that produce magnified images of structures that are too small to see with the unaided eye
  6. 10. a substance formed by the chemical combination of two or more elements in definite proportions.
  7. 12. atoms of the same element that differ in the number of neutrons they contain.
  8. 14. strong forces bind protons and neutrons together to form the ______
  9. 15. positively and negatively charged atoms
  10. 16. cells that contain nuclei
  11. 18. organisms that make their own food
  12. 22. the science that employs the scientific method to study living things
  13. 24. system a decimal system of measurements whose units are based on certain physical standards and are scaled on certain physical standards and are scaled on multiples of 10.
  14. 25. an attraction between molecules of the same substance.
  15. 26. a substance that speeds up the rate of a chemical reaction