Question

In: Biology

Which of these events occur as a prokaryotic mRNA is being transcribed that does not occur...

Which of these events occur as a prokaryotic mRNA is being transcribed that does not occur in a eukaryotic cell?

  • A. splicing
  • B. addition of a cap
  • C. addition of a poly-A tail
  • D. binding of ribosomes before transcription concludes
  • E. more than one of the above

Solutions

Expert Solution

Option D

A, B, C are exclusively found in eukaryotic messenger RNA. It is because RNA formed after transcription in case of eukaryotes contains non coding sequences called as introns. These sequences are not required in the template messenger RNA which is used for the process of translation during protein synthesis. So these sequences that are needed to be excluded from messenger rna. These processes occur only in case of eukaryotic messenger RNA.

But in case of prokaryotes, non coding sequences are absent and therefore RNA processing is not required. But both transcription and translation take place in cytoplasm in prokaryotes and therefore can be coupled together. This is called as co transcriptional translation. While messenger RNA is being synthesized from template DNA, it can participate in translation from the other side. This cannot occur in eukaryotes because transcription occurs in nucleus and translation occurs in cytoplasm and RNA processing occur after transcription before the beginning of translation.

Please give a good dating.


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