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Bell Task

Bell Task. Write down 3 features of mitochondria which help them carry out respiration. Name the useful substances produced in the Krebs cycle. Name the 3 stages of oxidative phosphorylation. Explain the term chemiosmosis. Homework Problem Areas. ATP as a universal energy currency.

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Bell Task

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  1. Bell Task • Write down 3 features of mitochondria which help them carry out respiration. • Name the useful substances produced in the Krebs cycle. • Name the 3 stages of oxidative phosphorylation. • Explain the term chemiosmosis.

  2. Homework Problem Areas • ATP as a universal energy currency. • Uses of ATP in plant cells.

  3. Today.. • Anaerobic pathways • Respiratory substrates and RQ • Respirometer

  4. Anaerobic Pathways • Oxidative phosporylation can’t happen without oxygen • Glycolysis does happen • Lactate or Ethanol pathway follows glycolysis so H carriers can be reused.

  5. How many ATP’s can be made per glucose in the anaerobic pathways?

  6. Which pathway? • Ethanol – yeast and some plant tissues = Alcoholic fermentation • Lactate pathway – other microbes and mammalian muscles when oxygen deprived

  7. Pathways page 12 Both pathways involving providing a H acceptor

  8. Ethanol pathway – not reversible • Lactate – can be reversed : • liver converts it back to pyruvate • or liver oxidises it to carbon dioxide and water • Or liver converts it to glycogen • Oxygen needed to get rid of lactate = oxygen debt

  9. Aerobic vs Anaerobic

  10. Respiratory substrates • Name the 3 possible respiratory substrates for cells. • Explain why having more H in a substrate increases it’s energy value. • Name the substrate with the greatest energy density. • Name the piece of apparatus used to determine the energy value of a substrate

  11. RQ • Compares oxygen used to carbon dioxide produced • Glucose produces 1:1 ratio • Other substrates differ • Write down RQ formula • List RQ values for the 3 substrates. • What does a high RQ value indicate? • Answer SAQ 1.8 (hint: balanced equation)

  12. Respirometer • Produce a labelled diagram of a respirometer and explain why the following are involved: • Soda lime • U tube containing fluid. • Control tube with glass beads • Syringe with a tap (on the control tube)

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