This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Primary Structure of Proteins, Subject name: Biochemistry
Protein structure not lost in denaturation is? 
Select and explain. 
A. Primary structure, B. Secondary structure, C. Tertiary structure, D. Quaternary structure
A: Primary structure
Answer: A: Primary structure 
Explanation: ANSWER: (A) Primary structureREF: Lehninger 4th Edition page 14, Lippincott's 4th Ed page 22See previous questionRepeat Biochemistry December 2010