Biology Crossword Puzzle

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