Cellular Respiration
All living cells including the cells in your body and the cells in yeast require energy for cellular activities such as movement, the transport of essential molecules in and out of the cell, reproduction and synthesizing of molecules. Adenosine tri-phosphate (ATP) is a high energy molecule that gives energy in a form that cells can use for their processes.
The process that cells use to transfer energy from organic molecules such as glucose in food to ATP is called Cellular Respiration. The source of glucose for the body is the food we eat. The chemical changes that occur in cellular respiration when oxygen is present is summarized as follows:
C6H12O2 + 6O2 → 6CO2 + 6H2O + ATP
Glucose oxygen carbon water energy
Gas dioxide gas
Cellular Respiration that uses oxygen (O2) is called aerobic respiration. Most of the time the cells in our bodies use aerobic respiration:
Aim:
To find out if the concentration of sucrose will affect the rate of cellular respiration in yeast?
Hypothesis:
The higher the concentration of sucrose, the faster the rate of cellular respiration.
Materials:
• 5 x 50ml Test tubes
• 1 x Test tube rack
• 5 x Labels
• 1 x Packet of Dry yeast
• 1 x 30cm Ruler
• 1 x Packet of Party Balloons
• Warm sucrose solution, 1%, 5%, 10%, 15%
To make sucrose solution:
1%; add 1g of sugar to every 99mls of water
5%; add 5g of sugar to every 95mls of water
10%; add 10g of sugar to every 90mls of water
15%; add 15g of sugar to every 85mls of water
Method:
1. Add 25mls of water to one of the five test tubes
2. Add 25mls of each, of the different concentrations of sucrose solution, to each of the test tubes
3. Add 1 teaspoon of yeast to each of the five test tubes
4. Attach one balloon to the top of each test tube
5. Shake the test tube carefully
6. Measure the depth of bubbles and observe how balloons change in 10 mins
7....