2018

• B

  
• C

  
• D

  
• B

  
• C

  
• D

  
• B

  
• C

  
• cytoplasm --- site of chemical reaction,

  mitochondria --- site of aerobic respiration,

  cell membrane --- controls what substances can enter and exit the cell,

  ribosome --- site of protein synthesis

  
• 1mm = 1000 micrometres

  2mm= 2000 micrometres

  = 100 micrometres (i divided by the amount of cells= 20)

  
• it doesn't require energy

  
• (b) 2

  (c) plasmolysed

  (d) Plant cells/cell 4 have a cell wall, it prevents cells from bursting

  
• (i) double helix

  (ii) complementary bases

  
• nucleus

  
• degradation reaction

  
• Describe the events occurring in the enzyme reaction shown. (3 marks)

  1. Enzyme and substrate bind together
  2. Reaction occurs at active site of the enzyme
  3. Two products are released

  
• muscle contraction,

  cell division (mitosis),

  protein synthesis,

  active transport