Discussion
Which of the following is a nontranslated sequence located between the transcription and the translation start site?
Answer: B
Correct answer: Leader sequence
The leader (5’ untranslated region) lies between the transcription start and the start codon. It is transcribed but not translated, and it carries the ribosome binding site - the Shine-Dalgarno sequence in bacteria. The corresponding untranslated stretch after the stop codon is the trailer.
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