1. Do Now Get out homework for checking
Complete the Do Now handout. It will be collected!

2. Proteins
This is the enzyme we’ll be using in the lab. What do you think it looks like?

3. Proteins have many different functions and structures.

4. Proteins are macromolecules made up of amino acids.

5. There are 20 different amino acids commonly found in nature.

6. Proteins are complex molecules

7. Here’s an amino acid
*Hydrogen atoms not shown
Forms 2 bonds to other amino acids. Called peptide bonds
This part is different for each kind
of amino acid.

8. Peptide bonds form by a condensation – JUST LIKE POLYSACCHARIDES!

9. Proteins are made of 1 or more polypeptides

10. Pectinase is the protein we’ll be using in the lab.

11. Pectinase attaches to pectin at the active site…

12. …And then breaks a bond in the polysaccharide!

13. Some proteins (like Pectinase) are enzymes
Some proteins (like Pectinase) are enzymes. Enzymes speed up all different kinds of reactions!

14. ENZYME
SUBSTRATE

15. SUBSTRATE Enzyme Enzymes are very selective about which
substrates they bind.
In other words,
They’re Specific.
Enzyme

16. Time to Think! What monomers are proteins made of?
What are some functions of proteins in living things?

17. More about Enzymes & Energy later – read up!
Section 3-3 “Proteins” pp
SR #2 & 3