This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
All help in protein folding except 
Select and explain. 
A. Chaperons, B. Zinc finger motiff, C. Protein disulfide isomerase, D. Proline-cis, trans- isomerase
B: Zinc finger motiff
Answer: B: Zinc finger motiff 
Explanation: Zinc finger motiff The specificity involved in the control of transcription requires that regulatory proteins bind with high affinity to the Correct region of DNA. Three unique motifs - The helix-turn-helix - Zinc finger - The leucine zipper accounts for many of this specific protein DNA interactions. So zinc finger motiff helps in binding of regulatory proteins to DNA and not in protein folding.