Biology Crossword Puzzle

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