1. Amino acids are linked together by condensation to form polypeptides.

2. There are 20 different amino acids in polypeptides synthesized on ribosomes. [Students should know that most organisms use the same 20 amino acids in the same genetic code although there are some exceptions. Specific examples could be used for illustration.]

3. Amino acids can be linked together in any sequence giving a huge range of possible polypeptides.

4. The amino acid sequence of polypeptides is coded for by genes.

5. A protein may consist of a single polypeptide or more than one polypeptide linked together.

6. The amino acid sequence determines the three-dimensional conformation of a protein.

7. Living organisms synthesize many different proteins with a wide range of functions.

8. Every individual has a unique proteome.

1. Rubisco, insulin, immunoglobulins, rhodopsin, collagen and spider silk as examples of the range of protein functions. [The detailed structure of the six proteins selected to illustrate the functions of proteins is not needed.]

2. Denaturation of proteins by heat or by deviation of pH from the optimum. [Egg white or albumin solutions can be used in denaturation experiments.]

Drawing molecular diagrams to show the formation of a peptide bond.