1.4 Protein
in AP Biology
Proteins are all constructed from the same set of 20 amino acids, linked in unbranched polymers. The bond between amino acids is called a peptide bond, so a polymer of amino acids is called a polypeptide. A protein is a biologically functional molecule made up of one or more polypeptides, each folded and coiled into a specific threedimensional structure.
To Think About:
What is the directionality of the subunits of Proteins? What are the four elements of protein structure? How may a change in the subunits of a protein lead to changes in structure or function?
Watch: AP Daily Video Protein
Answer the Following Questions:
- To which functional group are new amino acids added when forming peptide bonds?
- Complete this table：
| Level Protein Structure | Definition | Which bonds or forces cause this level of structure to form? |
|---|---|---|
| Primary | ||
| Secondary | ||
| Tertiary | ||
| Quatenary |
- How do the R-groups on amino acids influence protein folding?
- How would substituting a polar amino acid for a nonpolar amino acid affect a protein’s structure and function?
Supplementary Resources:
- Bozeman Science: Mr. Andersen’s “Proteins” video
- Game: Fold it
