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
Polypetide chain termination is enhanced by: 
Select and explain. 
A. Stop codon, B. Promoter, C. Ribosomal unit, D. All
A: Stop codon
Answer: A: Stop codon 
Explanation: A i.e. Stop Codon;