2.8: Cell respiration
Recap: structure of ATP
P P P
ribose guanine inorganic phosphate
deoxyribose thymine
organic phosphate
nicotinamide cytosine adenine flavine
ATP is a source of energy
Energy is released when ATP spits and forms ADP. The energy from this split is immediately available.
A lot of the energy produced by cells ends up as heat (environment) therefore the body needs a
continual source of energy.
ATP ADP
Cell respiration
Cell processes (active)
Recap: where in the cell?
1. Glycolysis1. Phosphorylation
2. Oxidation
2. Link reaction
3. Krebs cycle
4. Oxidative phosphorylation
Types of Respiration
Anaerobic Aerobic• No oxygen• Small yield of ATP
• Emergency supply of energy
• Oxygen• Large yield of ATP
• ‘normal’ energy supply
Anaerobic respiration
glucose
pyruvate
carbon dioxide + ethanal
ethanol
lactic acid
Yeast & plants
Yeast & plants
AnimalsAnimals
Aerobic respiration
glucose
pyruvate
Krebs cycle
Link reactionLink reaction
Waste products are
Carbon dioxide +
water
Waste products are
Carbon dioxide +
water
Investigation: Investigate how the type of sugar affects the rate of respiration.
Background information & procedure on moodle.
For each type of sugar, record the % CO2 every 60 seconds for 10 minutes. You will need this
data to complete this IB HL skill (8.1)
SKILL: Calculate and plot rates of reaction from raw experimental results
Homework
1.Graph the results 2.Considering these results:
• Does yeast use all these sugars equally?• Suggest a reason why.
3. Explain the three most important evaluation points from this experiment.
4. If you were to do this experiment again, what would you change in the procedure?