Biology Crossword Puzzle

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