Which of the following statements about bacterial mRNA transcript is TRUE?
A)Unlike eukaryotes, bacterial mRNA transcripts do not typically contain untranslated regions.
B)The Shine-Dalgarno box associates with an RNA component in the ribosomes.
C)Transcription and translation take place sequentially in bacterial cells.
D)Most bacterial genes contain a large number of introns and small number of exons.
E)The 5' end and 3' end of mRNA transcripts are modified in bacteria.

Question

Quizplus · Accepted Answer

The Shine-Dalgarno box is a conserved sequence found in the 5' untranslated region of bacterial mRNA transcripts. It base-pairs with a complementary sequence in the RNA component of the ribosome to position the ribosome at the start codon. Therefore, option B is the true statement about bacterial mRNA transcripts. Option A is incorrect because bacterial mRNA transcripts do contain untranslated regions. Option C is incorrect because transcription and translation can occur simultaneously in bacteria due to their lack of a membrane-bound nucleus. Option D is incorrect because bacteria do not have introns in their genes. Option E is incorrect because bacterial mRNA transcripts do not undergo the same types of modification seen in eukaryotic mRNA, such as 5' capping and 3' polyadenylation.

Which of the Following Statements About Bacterial MRNA Transcript Is