Question

Identify and describe the four levels of protein structure.

A. Primary, secondary, tertiary, quaternary
B. Alpha, beta, gamma, delta
C. Simple, complex, advanced, superior
D. Core, outer, folded, unfolded

Answer 1

The four levels of protein structure are: primary, secondary, tertiary, and quaternary.

Step-by-step explanation:

The four levels of protein structure are:

1. Primary structure: This refers to the specific sequence of amino acids in a protein. It is determined by the order of the nucleotide bases in the DNA or RNA that code for the protein.
2. Secondary structure: This refers to the folding or coiling of regions of the polypeptide chain due to hydrogen bonding between amino acids. The two common types of secondary structure are the alpha helix and the beta pleated sheet.
3. Tertiary structure: This refers to the overall three-dimensional shape of a single polypeptide chain. It is determined by interactions such as hydrogen bonding, disulfide bonds, and hydrophobic interactions.
4. Quaternary structure: This refers to the arrangement of multiple polypeptide chains or subunits in a protein. It is stabilized by various types of interactions between the subunits.