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
For glucose estimation in blood, the mode of transpo from a PHC to lab: 
Select and explain. 
A. Sodium fluoride, B. EDTA, C. Citrate, D. 0.9% saline
B: EDTA
Answer: B: EDTA 
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.