Messenger RNA (mRNA) is used during translation to form polypeptides. Describe how mRNA is produced in the nucleus of a cell.

This is a "Describe" question worth 6 marks, so you should aim to write a minimum of 6 points in your answer to get the full 6 marks.
Messenger RNA is produced in the nucleus of a cell by transcription. Firstly DNA Helicase (1) causes the DNA strands to separate by breaking hydrogen bonds (2). Then free RNA nucleotides are attracted to the exposed non-coding strand (3+4) and line up to it via complimentary base pairing (5). The enzyme RNA Polymerase then binds together the RNA nucleotides (6). Slicing then occurs removing the introns (7).

Answered by Rebecca V. Biology tutor

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