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DNA replication

DNA replication. Ch. 11.1. Before a cell can divide by mitosis or meiosis it must first make a copy of its chromosomes This process is called DNA replication DNA is composed of 2 strands containing a sequence of nucleotides

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DNA replication

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  1. DNA replication Ch. 11.1

  2. Before a cell can divide by mitosis or meiosis it must first make a copy of its chromosomes • This process is called DNA replication • DNA is composed of 2 strands containing a sequence of nucleotides • During replication, each strand serves as a pattern to make a new DNA molecule

  3. Begins as an enzyme breaks the hydrogen bonds between nitrogen bases that hold the 2 strands together, thus unzipping the DNA molecule • As DNA unzips, nucleotides that are floating free in the surrounding area bond to the single strands by base pairing. • Another enzyme bonds these new nucleotides into a chain

  4. Process continues until the entire molecule has been unzipped and replicated • Each new strand formed is a complement of one of the original strands • Result is the formation of 2 DNA molecules identical to the original DNA molecule

  5. Draw, label and describe DNA replication pg. 292-293

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