Question

what statement best describes the primary structure in proteins? it is when the polypeptide chains folds making a 3d shape it is when the protein is made of multiple polypeptides folded together (sub units) it is when the sequence of amino acids folds into a polypeptide alpha - helix or beta - pleated sheet it is a chemically connected sequence of amino acids

Explanation:

The primary structure of a protein is the linear sequence of amino - acids linked by peptide bonds. Folding into 3D shapes (like in the first option) refers to tertiary or quaternary structure. Multiple polypeptides folded together is quaternary structure. Folding into alpha - helix or beta - pleated sheet is secondary structure.

Answer:

It is a chemically connected sequence of amino acids