This document discusses proteins and their structure. It begins by asking how a protein is like a beaded necklace. It then discusses that proteins are made up of amino acid monomers that are joined together by peptide bonds to form a polymer chain. The chain folds into a complex 3D tertiary structure held together by hydrogen bonds, disulfide bridges, and other interactions. Applying heat can cause the bonds to break, denaturing the protein and unfolding it from its tertiary structure.

1. How do you think a protein is like a
beaded necklace?

2. Application:
Dietary Fibre
Textbook page 20

3. Protein
In your pairs
1.Where do you get it from?
2.What do you use it for?

4. Memorise....

5. H

6. Recreate!

7. Amino Acid
R group/
side chain Monomer of protein
Amine group
Carboxyl group
R group/Side chain
H
Use kits to
Amine
group
Carboxyl make amino
group
acids – use X
as R group
DO NOT BREAK UP YOUR MODELS

8. R groups

9. Draw the amino acid phenylalanine
Phenylalanine R group

10. Making a
Peptide
Di-peptide
Bond

12. Protein Folding

13. Tertiary Structure
Hydrogen bonds
Disulphide
bridges

15. Proteins
Monomer
Polymer
Bonds
between
monomers
Reaction

16. Denaturation
If we were to heat a protein....
- Hydrogen bonds break
- Tertiary Structure is lost
When you boil an egg what
happens to the white?
What was it like before,?
What is it like now?
Can you reverse the process?

17. Summary Questions: P 22
1. How is one amino acid different to
another?
2. Explain why a pregnant woman
needs to eat more protein in her diet
than a non pregnant woman of the
same age and body mass
Practice Questions
1. Name the monomers that make up
(i) carbohydrate and (ii) protein
2. Name three polysaccharides of
glucose
3. What reaction joins two
carbohydrate monomers?

18. Making Notes
Protein Subunits
Tertiary Structure
Denaturation

19. Past Paper Questions