Presentation on theme: "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."— Presentation transcript:
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.
Homework Problem Areas 1. ATP as a universal energy currency. 2. Uses of ATP in plant cells.
Anaerobic Pathways Oxidative phosporylation can’t happen without oxygen Glycolysis does happen Lactate or Ethanol pathway follows glycolysis so H carriers can be reused.
How many ATP’s can be made per glucose in the anaerobic pathways?
Which pathway? Ethanol – yeast and some plant tissues = Alcoholic fermentation Lactate pathway – other microbes and mammalian muscles when oxygen deprived
Pathways page 12 Both pathways involving providing a H acceptor
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
Aerobic vs Anaerobic AerobicAnerobic Location in cell Number of ATP produced per glucose Continuous Reaction Pathways involved
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
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)
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)