Biology crossword

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Across
  1. 2. Enzyme that joins plasmid with human DNA
  2. 9. A hard external skeleton in arthropods
  3. 11. Gives the endoplasmic reticulum its rough edges
  4. 12. Muscle wall that separates the left and right chamber
  5. 13. any substance taken into the body than modifies chemical reaction in the body
  6. 15. Movement of water through the cell membrane
  7. 16. Having two identical alleles of a particular gene
  8. 17. Many organelles that are in the cytoplasm
  9. 19. What is the process of biological classification
  10. 21. Breakdown of the alveoli by weakening the walls of the alveoli
  11. 24. When populations of a species are in decline, their numbers may be conserved
  12. 26. Loss of water vapour from plant leaves
  13. 27. Wave of contraction in the alimentary canal
  14. 28. Needed to make DNA in the plants
  15. 32. Enzyme that removes hydrogen from a substance
  16. 35. A spontaneous genetic change in which new alleles are formed
  17. 39. Process when red blood cells burst
  18. 40. Process that results in a serious oxygen shortage in the water
  19. 41. Chest pains when the blood supply to the heart is reduced
Down
  1. 1. This is combined with 3 molecules of an organic acid called fatty acid
  2. 3. Change in internal or external environment of an organ
  3. 4. Removal of nitrogen-containing part of amino acids to form urea
  4. 5. Cells in the trachea that secretes mucus
  5. 6. A process to slow down the rate of oxidation of sugar in the plant
  6. 7. Term used when the mass of living organisms is being considered
  7. 8. Bacterial DNA in the form of a circular strand
  8. 10. Enzymes in tears
  9. 14. Polysaccharide that forms a food storage substance in animal cells
  10. 18. Junction between 2 neurones
  11. 20. Nuclear division giving rise to genetically identical cells
  12. 21. The change in adaptive features of a population over time
  13. 22. Sac containing enzymes that break down egg membrane
  14. 23. Process where energy is obtained from food
  15. 25. A reaction that split large molecules into smaller ones
  16. 29. Movement of sucrose and amino acids in the phloem
  17. 30. The fusion of gamete nuclei
  18. 31. Process of getting energy from ammonia
  19. 33. Removal of toxic substances from organisms
  20. 34. Blood vessel that carries blood away from heart
  21. 36. Chemical substance on the surface of all cells
  22. 37. This respiration does not involve oxygen
  23. 38. Sheet of tissue that separates the thorax and the abdomen