biology

• Explain the role of the nucleus, 


  the nucleus contains genetic material including DNA which controls the activity of the cell
• Explain the role of the cell membrane,

  controls the movement of substances in and out of the cell
• Explain the role of the mitochondria 


  contains the enzyme for resperation and where energy is released for resperation
• explain the role of the cell wall 


  provides structure and support to the cell
• what is the role of chloroplast


  contains a free pigment called chlorophyll where photosynthesis takes place and it absorbed sunlight
• what happens in interphase?

  chromosomes replicate new organelles made
• prophase?


  chromosomes condense spindle fibers form nuclear membrane breaks down
• metaphase? 


  chromosomes line up along the middle of the cell. chromosomes are attached attached to spindle fibres
• anaphase/


  spindle fibers contract. chromosomes split chromosomes separate or are pulled apart to opposite ends of the cell by the spindle fibers
• prophase 


  chromo condense

  the membrane around the nucleus breaks down

  chromosomes lie free in the cytoplasm
• metaphse


  the chromosomes line up at the center of the cell
• mitosis is important because it allows growth, repair and reproduction.
• anaphase


  spindle fivers pull the chromosomes apart

  the chrono tide are pulled to oposite ends of the cell
• cytokinesis


  the cytoplasm and cell memberane divide to form 2 daughter cells