Questions: Identify the level of protein structure for the following: - the shape of a globular protein - a protein with two or more peptide chains - order of amino acids in a protein - beta-pleated sheet - disulfide bonds between R groups

The answer is as follows:

$\square$ the shape of a globular protein The answer is the third one (3): tertiary Explanation: The shape of a globular protein is determined by the overall three-dimensional folding of the polypeptide chain, which is characteristic of the tertiary structure. This includes interactions such as hydrogen bonds, disulfide bonds, hydrophobic interactions, and ionic bonds between the R groups of the amino acids.

$\square$ a protein with two or more The answer is the fourth one (4): quaternary Explanation: A protein with two or more polypeptide chains refers to the quaternary structure. This level of structure involves the assembly and arrangement of multiple polypeptide subunits into a functional protein complex.

Summary:

• The shape of a globular protein corresponds to the tertiary structure.
• A protein with two or more polypeptide chains corresponds to the quaternary structure.