RNA Plays Several Important Roles in the Processes That Express

question 5

Essay

RNA plays several important roles in the processes that express genetic information from DNA into protein products. Illustrate the events of transcription in a bacterial cell and indicate where RNA plays a role. Also indicate what role RNA plays in translation in bacterial cells.

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Definitions:

Transcribed DNA Strand

The strand of DNA that serves as a template for RNA synthesis during the process of transcription.

Introns

Non-coding sections of an RNA transcript, or the DNA encoding it, that are spliced out before the RNA molecule is translated into a protein.

Pre-mRNA

RNA precursor to mRNA in eukaryotes; contains both introns and exons.

Exon Combinations

Variations in the assembly of exons during mRNA processing, resulting in different mRNA molecules from the same DNA sequence.