rna transcription
DESCRIPTION
RNA Transcription. RNA transcription occurs within the cells of all living organisms. CLICK HERE. The messenger RNA (mRNA) must first travel into the nucleus of the cell. CLICK HERE. http://www.ocf.berkeley.edu/~edy/genome/chromosomes.jpg. - PowerPoint PPT PresentationTRANSCRIPT
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.
CLICK HERE
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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http://content.answers.com/main/content/wp/en/8/87/DNA_orbit_animated_small.gif
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
CLICK HERE
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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