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Molecular Level of Genetics

Resource for Grades 9-12
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Molecular Level of Genetics

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Source: Dennis O'Neil


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WGBH Educational Foundation

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WGBH Educational Foundation

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National Science Foundation

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Get down to the molecular nitty-gritty of DNA replication and protein synthesis in this article by Dennis O'Neil.

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open Background Essay

Think all DNA resides in the nucleus? Want to know how to decipher a DNA code into protein? This article, filled with colorful visuals, takes you down to the microscopic level as it explains the workings of DNA, RNA, and proteins inside living cells.
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open Discussion Questions

  • Why do you think DNA exists as a double helix, versus some other shape like a highly folded protein or a linear, single-stranded fatty acid?
  • In eukaryotic cells, DNA is "trapped" inside two organelles. What are they? Do you think this is simply a biological coincidence, or might there be some benefit to cells that keep their DNA inside these structures?
  • What is a codon? Do all codons code for amino acids?
  • How can mutations occur during DNA replication? Can all genetic mutations be passed along from parents to offspring?
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