Biology Crossword Puzzle

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Across
  1. 1. a substance that speeds up the rate of a chemical reaction
  2. 3. 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.
  3. 8. region outside of the thylakoid membranes
  4. 9. contain only a single set of chromosomes and therefore only a set of genes
  5. 10. organisms that obtain energy from foods they consume
  6. 11. an organized way of using evidence to learn about the natural
  7. 13. variable that is deliberately changed
  8. 16. positively and negatively charged atoms
  9. 17. a disorder in which some of the body's own cells lose the ability to control cell growth
  10. 19. the process of homologous chromosomes pairing up and forming tetras in meiosis I then exchanging portion of their chromatids is called ___
  11. 20. cells that do not contain nuclei
  12. 24. devices that produce magnified images of structures that are too small to see with the unaided eye
  13. 25. portion of the cell outside the nucleus
  14. 26. cell is able to reproduce so that a group of cells.
  15. 28. variable that is observed and that changes in response to the manipulated variable is called _______
  16. 31. atoms of the same element that differ in the number of neutrons they contain.
  17. 32. proposed scientific explanation for a set of observations
  18. 34. smallest unit of most compounds
  19. 37. small particles of RNA and protein found throughout the cytoplasm
  20. 38. strong forces bind protons and neutrons together to form the ______
Down
  1. 1. forms when electrons are shared between atoms
  2. 2. organisms that make their own food
  3. 4. the process of gathering information about events or processes in a careful, orderly way.
  4. 5. a slight attraction can develop between the oppositely charged regions of nearby molecules.
  5. 6. amount of energy needed to raise the temperature of a gram of water degree celsius
  6. 7. plants use high energy of sunlight to convert water and carbon dioxide into high-energy carbohydrates
  7. 12. cells that contain nuclei
  8. 14. a pure substance that consists entirely of one type of atom
  9. 15. the site where lipid components of the cell membrane are assembled, along with proteins and other materials that are exported from the cell
  10. 18. the first and longest stage of mitosis
  11. 19. 2 tiny structures located in the cytoplasm near the nuclear envelope, separate and take up positions on opposite sides of the nucleus.
  12. 21. second phase of mitosis and often times only lasts a few minutes
  13. 22. DNA is a long molecule made up of units
  14. 23. a cell that contains both sets of homologous chromosomes
  15. 27. an attraction between molecules of the same substance.
  16. 29. proteins that act as biological catalysts.
  17. 30. a kind of virus that infects bacteria
  18. 33. Bond/ formed when one or more electrons are transferred from one atom to another.
  19. 35. a substance formed by the chemical combination of two or more elements in definite proportions.
  20. 36. the science that employs the scientific method to study living things