Example2:

Building a protein from amino acids:

Substrate: Amino acids

Product: The protein

Beginning substance(s)

Ending substances

Reactant(s) ProductsSubstrate(s) Notes

We define:

Chemical reaction: A process where atoms and bonds are re-arranged.

Consider the Benedict result from the four test tubes:(1. water, 2. starch, 3. saliva, 4. saliva + starch)1) Which one showed presence of sugar? Why not in the others?2) What was the purpose of dipping in warm water?3) What was the purpose of the boiling water in the end?

Enzyme notes – cont.

Digestion by saliva Amylase

Starch Glucose

Example1:

Substrate: Starch(Amylose)

Products: Glucose molecules

Process of Enzyme Action:

Reactants Products

s l o w

Substrates

fast!

Enzyme

Process of Enzyme Action:

Bindingto Active Site

complexProduct release

Product release

Process of Enzyme Action: Notes

Step 1: Enzyme binds substrateStep 2: Enzyme and Substrate form

a complex.Step 3: Changes occur in substrate.Step 4: Release of products,

enzyme can start again.

fast!

Notes

Process of Enzyme Action:

1. Bindingto

Active Site

2. Temporary Enzyme-Substrate Complex

3. Product Release1

4. Product Release2

Enzyme Animation

Course Website

Starch digestion

Amylase (enzyme)

Amylose / Starch (Substrate)

Fragmented polysaccharide (Product)

1)What is the relationship between:

a. enzyme, proteinb. enzyme, amino acidsc. amylase, enzymed. protein, amino acids2) Arrange the four terms in a

brace map, using ‘our’ arrows. enzyme, protein, amino acids, amylase.

09.07.11 Journal 2