RNA transcription occurs within the cells of all living organisms.

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The messenger RNA (mRNA) must first travel into the nucleus of the cell.

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http://www.ocf.berkeley.edu/~edy/genome/chromosomes.jpg

Once the mRNA is inside of the nucleus it searches within a certain chromosome.

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Furthermore, it searches for a specific gene within that chromosome.

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It is in this gene that the mRNA will copy the required information to make a protein.

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= Thymine = Guanine = Adenine = Cytosine

First, an enzyme ‘unzips’ the DNA by breaking the hydrogen bonds, which are connecting the

nitrogen bases. This allows the mRNA to enter. CLICK HERE

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Next, the mRNA nucleotides temporarily match up with the appropriate DNA nucleotides from

only one side of the DNA. CLICK HERE

Note that mRNA does not contain T (thymine), instead U (uracil) is paired with A (adenine). This enables the mRNA to leave the cell nucleus. Because DNA always contains thymine it can never leave the nucleus of a cell.

After copying the required information the mRNA carries this information to the ribosome, where it

will be turned into a protein. CLICK HERE

After the mRNA exits the DNA, the hydrogen bonds of the gene ‘zip’ back together. The DNA

is not changed AT ALL during transcription.CLICK HERE

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