Protein & enzymes

3. The unique region of an enzyme where the substrate binds.
9. A chain of 20 or more amino acids.
12. A spiral-shaped secondary protein structure held together by hydrogen bonds.
15. The cellular structure that acts as an enzyme to facilitate peptide bond formation.
16. An organic reaction helper, such as NAD+
17. The monomer unit of proteins; there are 20 unique types.
18. The covalent bond formed between two amino acids during polymerization.

1. Often written as EA, this is the energy required to start a chemical reaction.
2. The level of protein structure referring specifically to the sequence of amino acids.
4. The specific reactant(s) that an enzyme acts upon.
5. A type of inhibitor that blocks the active site directly.
6. To speed up a chemical reaction in a timely manner using an enzyme.
7. The process where a protein unfolds and loses its higher-order structure due to heat or pH.
8. Protein structure resulting from the association of multiple polypeptide subunits.
9. A back-and-forth secondary protein structure (beta-sheet).
10. A type of regulation where an activator or inhibitor binds to a site other than the active site.
11. A type of inhibition where the end product of a pathway shuts down an earlier step.
13. A reaction helper, such as an ion, required for enzyme activity.
14. Molecules that help proteins fold into their correct functional shapes.