What are the two types of secondary structures found in polypeptides, and what maintains them? What stabilizes the tertiary structure of a polypeptide?

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

d. Proteins are composed of strings of fatty acids linked by glycosidic bonds.

An enzyme is a:

a. biological catalyst that increases the concentration of the products.

b. biological catalyst that increases the concentration of the reactants.

c. chemical that is used in a reaction, after which it can no longer be used by the cell.

d. biological catalyst that works by bringing its substrates closer to their transition states.

Why is it important for a protein to maintain its structure? What is it called when a protein loses its structure?