Biology Crossword Puzzle

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