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?