What are some limitations of using a DNA molecule model ?

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I'm assuming that you're referring to a physical model of a DNA molecule.

One limitation of this representation is the fact that it comes nowhere near representing the actual size and complexity of a gene, let alone an entire genome. This is a fairly common issue with models of very large or very small things; the scales involved are very difficult for most people to visualize and understand, because they're beyond anything that we are accustomed to working with. Similar to the way that it's hard to visualize...

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