DNA Doesn’t Look Like What You Think!
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[PBS Intro] I hate to tell you this, but if you’ve ever looked at a biology textbook, chances are it was lying to you. Or at least not telling you the whole story– about DNA. Today, we’re going to fix that. [OPEN] Real quick, what image comes to mind when I say “DNA”. Have you got it? You’re probably imagining something like this, or this, or maybe this? That’s not what DNA looks like. Of course you can’t exactly take a photograph of DNA, or see it through your typical microscope. It’s simply too small. A double helix of DNA is just 2 nanometers wide. A DNA strand next to a piece of hair is like a person standing next to The State of Rhode Island. Even the best light microscopes can’t see anything much smaller than about 200 nm, beca...
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[PBS Intro] I hate to tell you this, but if you’ve ever looked at a biology textbook, chances are it was lying to you. Or at least not telling you the whole story– about DNA. Today, we’re going to fix that. [OPEN] Real quick, what image comes to mind when I say “DNA”. Have you got it? You’re probably imagining something like this, or this, or maybe this? That’s not what DNA looks like. Of course you can’t exactly take a photograph of DNA, or see it through your typical microscope. It’s simply too small. A double helix of DNA is just 2 nanometers wide. A DNA strand next to a piece of hair is like a person standing next to The State of Rhode Island. Even the best light microscopes can’t see anything much smaller than about 200 nm, beca...
