Question

identify the overall level of protein structure shown in the image below.
select the correct answer below:
primary
secondary
tertiary
quaternary

Explanation:

Protein structure levels:

• Primary: Amino acid sequence.
• Secondary: Local folding (alpha - helix, pleated sheet).
• Tertiary: Overall 3 - D shape (combines secondary structures).
• Quaternary: Multiple polypeptide chains.

The image combines alpha - helix and pleated sheet into an overall 3 - D shape, which is tertiary structure.

Answer:

tertiary