1. Enzymes

2. Digestion
Food has to be broken down so we can use the stuff its made from
Different food groups contain different useful substances

3. What are the different food groups?
Starchy Carbohydrates
Proteins
Fats

4. Starchy Carbohydrates
Rice, pasta, potatoes, cereals and bread
Slow releasing energy
High in STARCH

5. Starch Produced by most green plants for storage
Iodine turns blue/black

6. Task Bread contains the storage molecule- starch
Take a bit of bread and chew it- keep chewing it and don’t swallow- the taste will start to change
What does it taste like?

7. Starch Starch is made from lots of sugar molecules joined together
Digestion starts in the mouth- broken down into sugar
Break down catalysed by the enzyme AMYLASE in saliva
Amylase is the enzyme which breaks down starch into sugar (maltose)

8. Experiment- What is amylase?
Using our knowledge about amylase we are going to test 3 unknown chemicals to find out which one is Amylase AIM: To find out which enzyme A,B or C is amylase

9. Apparatus 3 droppers Measuring cylinder 3 test tubes Starch solution
Test tube rack
Iodine Solution
Stopclock
6 sticky labels
Dimple tray
Enzyme A, B and C

10. Method Label the test tubes A, B and C
Add roughly 2mls of each enzyme into the correctly labelled test tube
Measure 10 mls of starch (using the measuring cylinder) into each test tube and add to each test tube- start the stop clock
After 3 minutes remove a small sample from each test tube (using correct dropper) and place in dimple tray- test with iodine and note result
Repeat every 3 minutes

11. Conclusion Which enzyme was amylase?
Explain how you came to your conclusion

12. What’s the question?
Important reactions would be too slow to maintain life
400 billion per second
Digestion
The three main food groups
Starch
Amylase