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. image of protein structures: primary, secondary, tertiary 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 tertiary structure has multiple polypeptide chains. a protein’s tertiary structure is important for its function.

Explanation:

1. From the text: "In proteins with only one polypeptide chain, the tertiary structure is the final three - dimensional shape of the protein", so the first statement is true.
2. The text says "Secondary structures of proteins fold and interact with each other to form a tertiary structure", so the second statement is true.
3. The statement "A tertiary structure has multiple polypeptide chains" is false because the text specifies that for proteins with one polypeptide chain, the tertiary structure is the final structure. Proteins with multiple polypeptide chains have a quaternary structure (not mentioned here but the given statement is incorrect as per the context).
4. The tertiary structure of a protein determines its function (a known biological fact and also implied by the importance of the final structure), so the fourth statement is true.

Answer:

The true statements are:

• 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.