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
Shine-Dalgarno sequence in bacterial mRNA is near 
Select and explain. 
A. AUG codon, B. UAA codon, C. UAG codon, D. UGA codon
A: AUG codon
Answer: A: AUG codon 
Explanation: SD sequence is located-6 to -10 bp from initiating AUG codon on m-RNA molecule near its 5' end. It is seen in prokaryotes only.
Kozak consenses sequence is present in eukaryotes. This sequence surrounds AUG & determines the initiating codon of m-RNA.