What is the protein structure level in human hair?Group of answer choicestertiaryprimarysecondaryquarternary

In human hair, the protein structure level is primarily quaternary. Here's a breakdown of the reasoning:

1. Primary Structure: This refers to the linear sequence of amino acids in the protein chain. While hair does have a primary structure, it is not considered the defining characteristic of the protein structure of hair.

2. Secondary Structure: This involves the localized folding of the polypeptide chain, such as alpha-helix and beta-sheet formations. While protein components in hair exhibit some secondary structures, they are not the primary focus.

3. Tertiary Structure: This level refers to the overall three-dimensional shape of a single polypeptide chain. Again, this is present but does not capture the complexity of hair proteins.

4. Quaternary Structure: In human hair, the primary protein is keratin, which exists as a complex of multiple polypeptide chains that are associated together. This association of several protein chains forms the quaternary structure, which is critical for the hair's strength and functionality.

Final Answer

Quaternary is the correct answer regarding the protein structure level in human hair.