Question

secondary structures of proteins fold and interact with each other to form a tertiary structure. in proteins with only one polypeptide chain, the tertiary structure is the final three - dimensional shape of the protein.
the model below shows parts of the primary, secondary, and tertiary structures of a protein.
select the true statements.
the final structure of a protein with one polypeptide chain is its tertiary structure.
secondary structures interact to form a tertiary structure.
a proteins tertiary structure is important for its function.
a tertiary structure has multiple polypeptide chains.

Explanation:

• The first statement is true as per the text: "In proteins with only one polypeptide chain, the tertiary structure is the final three - dimensional shape of the protein."
• The second statement is true as the text says "Secondary structures of proteins fold and interact with each other to form a tertiary structure."
• The third statement is true because a protein's function is highly dependent on its three - dimensional (tertiary) structure. For example, enzymes (which are proteins) have specific active sites in their tertiary structure that bind to substrates.
• The fourth statement is false. A tertiary structure can be formed by a single polypeptide chain. Quaternary structure is formed when multiple polypeptide chains interact.

Answer:

• The final structure of a protein with one polypeptide chain is its tertiary structure.
• Secondary structures interact to form a tertiary structure.
• A protein's tertiary structure is important for its function.