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Dominic John Repici
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Simply stated, transcription is the process of making an RNA sequence from a segment of DNA, which is then used as a template by cellular machinery. It is the process by which a sequence of instructions is retrieved from a DNA strand, and copied into an RNA strand.
Specialized molecular machines are employed to retrieve, and copy the instruction-sequences out of the DNA strand into mRNA strands. The mRNA conveyed instruction-sequences are then used by other molecular machinery, which follow them to produce the three-dimensional protein structures that make up all biological substances. This includes the molecular machines discussed here, as well as many other molecular machines used in cell functions.