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 Related Pages: DNA Introduction P&T DNA Structure P&T |
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DNA REPLICATION:
Teachers, Students, Home School Scholars, and Inquiring Minds of all ages -- Understanding how DNA is faithfully replicated time and time again was key to accepting that DNA could, indeed, be the hereditary material that had been sought for so very long. Once you understand how it works, it is quite simple and elegant. The DNA strand is often compared with a zipper, and aptly so. When it is time to replicate, one small section at a time is unraveled and a duplicate made. Section by section is replicated until the entire DNA strand has been transformed into two identical DNA strands. While 'unzipping' is a critical part of the process, so too is the fact that the 4 nucleotides that make up DNA only occur in specific pairs -- A with T and C with G. These pairing occur automatically because they are attracted to each other by non-covalent bonds. We compare this type of bond with sticky paper that can be attached to one place and stay put until, with very little effort, it is removed. So too will the nucleotide pairs remain attached to each other - actually holding both strands of DNA together - until it is time to replicate and the nucleotide pairs are pulled apart.
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