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: Biochemistry
Which of the following contribute in polypeptide synthesis: 
Select and explain. 
A. Leader sequence, B. Enhancer, C. tRNA, D. ncRNA
B: Enhancer
Answer: B: Enhancer 
Explanation: Enhancer is the cis-acting DNA sequence that increases the rate of inhibition of transcription of eukaryotic genes by RNA polymerase. Leader sequence: The untranslated segment of mRNA before the sta codon. Ref: Harper, 28th Edition, Page 343