1) What is meant by the primary structure of a protein molecule? How does it differ from the secondary structure

1) What is meant by the primary structure of a protein molecule? How does it differ from the secondary structure

of a protein? (2) How are secondary protein structures held together? (3) Discuss the importance of the tertiary and quaternary structures of proteins. Do all proteins have primary, secondary, tertiary, and quaternary structures? Explain. You must provide sufficient detail in your answer and incorporate information from the course materials to receive credit.