exam questions

• Describe the structure of a cellulose cell wall (3)

  -       Cellulose molecule is a polymer of B glucose 

  -       Cellulose molecules held together by hydrogen bonds- as microfibrils 

  -       Microfibrils arranged in a net 

  -       Forming a matrix with pectin, lignin
• State the function of structures B and C 

  -       Pits=facilitate transport between cells/allow substances to pass from one cell to another easily 

  -       Plasmodesmata=connect the cytoplasm of neighbouring cells, allowing substances to transport w/o having to cross membranes + aids cell to cell communication
• Explain the role of the middle lamella when a plant cell complete mitosis (2) 

  -       Produced between adjacent new cells in the cell plate 

  -       Because the middle lamella holds cell walls together
• State function of the plasmodesmata

  -       Cytoplasmic connection between cells 

  -       Which allows transport/communication between cells