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Published byIsabelle Clee Modified over 10 years ago
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Bell Task 1. Write down 3 features of mitochondria which help them carry out respiration. 2. Name the useful substances produced in the Krebs cycle. 3. Name the 3 stages of oxidative phosphorylation. 4. Explain the term chemiosmosis.
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Homework Problem Areas 1. ATP as a universal energy currency. 2. Uses of ATP in plant cells.
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Today.. 1. Anaerobic pathways 2. Respiratory substrates and RQ 3. Respirometer
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Anaerobic Pathways Oxidative phosporylation can’t happen without oxygen Glycolysis does happen Lactate or Ethanol pathway follows glycolysis so H carriers can be reused.
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How many ATP’s can be made per glucose in the anaerobic pathways?
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Which pathway? Ethanol – yeast and some plant tissues = Alcoholic fermentation Lactate pathway – other microbes and mammalian muscles when oxygen deprived
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Pathways page 12 Both pathways involving providing a H acceptor
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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
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Aerobic vs Anaerobic AerobicAnerobic Location in cell Number of ATP produced per glucose Continuous Reaction Pathways involved
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Respiratory substrates 1. Name the 3 possible respiratory substrates for cells. 2. Explain why having more H in a substrate increases it’s energy value. 3. Name the substrate with the greatest energy density. 4. Name the piece of apparatus used to determine the energy value of a substrate
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RQ Compares oxygen used to carbon dioxide produced Glucose produces 1:1 ratio Other substrates differ 1. Write down RQ formula 2. List RQ values for the 3 substrates. 3. What does a high RQ value indicate? 4. Answer SAQ 1.8 (hint: balanced equation)
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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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