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Proteins and Nucleic Acids: Transcription
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<p class="pagetitle"><strong>Proteins and Nucleic Acids:</strong> Transcription</p>
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<td><p class="mainidea">DNA carries information in the sequence of bases in its strand. Transcription is the process of reading the information and storing it in the messenger RNA.</p></td>
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Transcription: From DNA to messenger RNA
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In the model below, the nucleotides have been simplified as two connected
beads, as follows (using G as an example):
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<font size="4" face="Verdana,sans-serif">DNA contains
the information that controls the production of proteins. The sequence of DNA nucleotides is used to specify a sequence for RNA,
which in turn determines the amino acid sequence in a protein. During a
process called <b> transcription,</b> RNA polymerase, an enzyme, uses one strand
of DNA as template to assemble nucleotides into a strand of RNA. (Note:
RNA contains the
nucleotide, Uracil, that binds with Adenine, and
does not have Thymine.) The model shows transcription. Change the sequence to see what happens.</font>
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A Challenge: Making RNA
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Your challenge is to produce a short RNA segment with the following
sequence:<br><br><img src="challengeRNA.gif"><br><br>
Use the pull down menus below the model to change the sequence of the DNA fragment.
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Use the pull-down menus to change the DNA sequence: <b><font size="4">➩</font>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Is photocopying
a document similar to making an RNA strand? Explain how the two processes
are alike and how they are different.</strong></font>
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Place the snapshot of your completed RNA strand.
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