seaans20391
17.12.2019 •
Biology
The shine-dalgarno sequence in bacteria a) is a purine-rich consensus sequence found in the 5ʹ utr of the mrna b) is a pyrimidine-rich consensus sequence found in the 3ʹ utr of the mrna c) is a purine-rich consensus sequence found
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Ответ:
The correct answer is a) is a purine-rich consensus sequence found in the 5ʹ UTR of the mRNA.
Explanation:
The mRNA of bacteria contains Shine- Dalgarno sequence and initiation codon which together make up the ribosomal binding site. The Shine-Dalgarno sequence(5'- AGGAGGU-3') is a short polypurine sequence that is found at 5' end of UTR of the mRNA.
Shine-Dalgarno sequence is found 3-10 nucleotides upstream to start codon(AUG). This sequence is complementary to a region of the 16S rRNA component of small ribosomal units found in bacteria.
So Shine-Dalgarno sequence play an important role in the attachment of small ribosomal subunit of bacteria and recognition of start codon. So the right answer is a.
Ответ: