Question

Which level of protein organization describes the conformation of portions of the polypeptide chain?

1) Primary structure
2) Secondary structure
3) Tertiary structure
4) Quaternary structure

Answer 1

Option 2.

The secondary structure of a protein refers to the conformation of portions of the polypeptide chain, including organized patterns like α-helices and β-pleated sheets.

Step-by-step explanation:

The level of protein organization that describes the conformation of portions of the polypeptide chain is the secondary structure.

This level of structure includes the folding of the polypeptide chain into organized patterns such as the α-helix and β-pleated sheets.

These structures are stabilized by hydrogen bonds between the backbone atoms of the amino acids in the chain.

The primary structure reflects the sequence of amino acids, the tertiary structure describes the overall three-dimensional shape of the single polypeptide chain, and the quaternary structure refers to the arrangement of multiple polypeptide subunits in a multi-subunit protein.

In conclusion, the correct option which defines the conformation of portions of the polypeptide chain is option 2) Secondary structure.