Cell Cycle

• What is the cell cycle?

  A) Cytokinesis

  B) Interphase

  C) Mitosis

  D) Time

  
• Which phases is the longest?

  Interphase
• What happens during interphase?

  • G1 - cell receives signal to divide again. Cell make RNA, enzymes, proteins needed for growth. The DNA in nucleus replicates
  • S phase - DNA is synthesised
  • G2 phase - cell continues to grow & DNA is checked for any errors (which are repaired)
• What does G in G1 & G2 stand for?

  Growth
• What does S in the S phase stand for?

  Synthesis
• What happens in the mitosis phase?

  Cell growth stops & the nucleus divides into two
• What happens in the cytokinesis phase?

  Whole cell divides & one nucleus moves into each cell to create 2 identical daughter cells.
• What happens to animal cells in cytokinesis?

  Cytoplasm is split into the two cells
• What happens to plant cells in cytokinesis?

  A new cell wall forms
• Where does protein synthesis occur in the cell cycle?

  Interphase - G1
• What are the different checkpoints in the cell cycle?

  • G1 - checks for any damage to the DNA. Cell cycle will not continue unless the damage is repaired.
  • S checkpoint - checks all chromosomes have been successfully replicated
  • G2 checkpoint - another check for DNA damage. Cell cycle will not continue unless the damage is repaired.
  • Metaphase - checks to see whether chromosomes are attached to spindle fibres