2019 Paper 1

• explain how the structures of amylopectin and glycogen make them suitable for storing energy


  -they are branched therefore can be rapidly hydrolysed

  -they are compact can store more energy

  -they are insoluble so there is not osmotic effect and will not be used up
• explain why high levels of sugars in a person's diet could lead to obesity


  the energy intake will be higher than the energy output and this means excess energy will be stored

  this will increase the weight and this may lead to the person becoming overweight
• explain why sucralose cannot be broken down by sucrase


  sucralose contains chlorine therefore the shape of the molecule has been changed

  sucralose is not complementary to the active sit of sucrase / enzyme substrate complex does not form
• what is a gene


  a sequence of bases in dna which is coding for a sequence of amino acids