Answered: All cells must replicate their DNA…

All cells must replicate their DNA before each cell division. Why is it that DNA has to be replicated extremely accurately, with very few errors?

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter21: Dna, Genes, And Biotechnology

Section: Chapter Questions

Problem 1RQ: Why is DNA replication called semiconservative?

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All cells must replicate their DNA before each cell division. Why is it that DNA has to be replicated extremely accurately, with very few errors?

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Why is it important for a chromosome to be copied before mitosis?
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How does DNA replication occur in a precise manner to ensure that identical genetic information is put into the new chromatid? See Figures 8.12 and 8.13. FIGURE 8.12 In DNA replication, the two polynucleotide strands uncoil, and each is a template for synthesizing a new strand. A replicated DNA molecule contains one new strand and one old strand. This mechanism is called semiconservative replication. FIGURE 8.13 A close-up look at the process of DNA replication. (a) As the strands uncoil, bases are added to the newly synthesized strand by complementary base pairing with bases in the template strand. The new bases are linked together by DNA polymerase. (b) DNA synthesis can proceed only in the 5 3 direction; newly synthesized DNA on one template strand is made in short segments and linked together by the enzyme DNA ligase.