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Across 3. The nucleotide base which pairs with guanine 6. The inside of the cell which is composed of organelles and cytosol 9. The proteins within the chromatin which control the expression of genes 11. Sugars which are attached to lipids 13. Cells which do not reproduce (such as nerve, muscle, pancreas and kidney cells) are said to remain in this phase 14. The final stage of mitosis where the cell physically splits into two daughter cells 15. The elaborate network of rods in the cytosol which support the shape of the cell and generate movement within the cell 16. The nucleotide base which pairs with thymine 17. The outer layer of the cell 18. The type of bond which joins nucleotide bases 19. The plasma membrane of the cell is described as having this type of model 20. The process of DNA to pre-mRNA to mRNA 21. The fourth stage of mitosis in which the cytoplasm starts to divide 24. The process of creating an amino acid polypeptide strand from mRNA 28. A series of membranes which are studded with ribosomes which manufacture and pack proteins 30. The carrier RNA which transfers the required amino acid to the ribosome for translation 31. A vesicle which contains oxidase enzymes which detoxify harmful substances such as free radicals 34. DNA sequences on the ends of chromosomes which limit the amount of times that a cell can divide 35. Intracellular structures 37. The non-coding part of DNA 40. What does RNA stand for? 41. The powerhouse of the cell which is shaped like nutrigrain cereal 44. The second stage of mitosis in which the chromosomes line up at the cell's equator 50. The condensed form of chromatin which have the characteristic X shape 51. The fuzzy sugar coating on the cell 52. The fluid which surrounds the organelles within the cell (forms part of the cytoplasm) 53. The basic subunit of DNA is composed of a phophate, pentose sugar and a base 54. The 2 globular protein organelle which manufactures proteins 55. Where translation takes place 56. Programmed cell death which is important during foetal development and for elimination of excessive, old or damaged cells 57. A piece of DNA which codes for a specific protein 58. The third stage of mitosis in which the chromosomes are pulled apart

Down 1. Errors in the DNA strand 2. The nucleotide base which pairs with adenine 4. A continuation of the rough endoplasmic reticulum which is not studded with ribosomes 5. This type of protein is located within the plasma membrane 7. This type of protein is loosely attached to the inner or outer surface of the plasma membrane 8. Sugars which are attached to proteins 10. The outer membrane of the nucleus 12. What does DNA stand for? 13. The nucleotide base which pairs with cytosine 22. The epigenetic marker which switches gene expression ON 23. DNA is often described as having this structure 24. This type of integral protein spans the width of the plasma membrane 25. The phase of the cell cycle in which the cell spends the majority of its time 26. A series of flattened sacs which modify and package proteins produced in the endoplasmic reticulum 27. The lipid molecule which stabilises and regulates the fluidity of the plasma membrane 29. Another name for cell division 32. The coding part of DNA 33. The control centre of the cell which contains the DNA 36. The hydrophilic heads of the phospholipid molecules have this property 38. The hydrophobic tails of the phospholipid molecules have this property 39. A restriction point which allows or denies progression into the S phase 42. The epigenetic marker which switches gene expression OFF 43. The dark staining body within the nucleus 45. The first stage of mitosis in which the chromosomes duplicate 46. A vesicle which contains acidic digestive enzymes which is involved in digesting foreign particles and old worn out cell components 47. The enzyme which helps to lengthen shortening telomeres. AKA the immortality enzyme 48. Where transcription takes place 49. Another name for the unorganised DNA and histones in the nucleus