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Molecule World

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In 1925, dogsledders raced through the frozen Alaskan bush to bring antiserum to the isolated village of Nome.  The antiserum arrived in time, saved the lives of many villagers from the horrors of diphtheria, and inspired the Iditarod, a famous race in celebration of the dog sledders’ heroic feat. West Africa could use a similar effort today.…

What’s the first you think about when you see a spider?  Running away?  Danger?  Fairies? Spiderman? Do you wonder if spider silk is really strong enough to stop a train, like they showed in Spiderman 2? Whatever your thoughts, you’re probably not thinking about 3D printing in space.  Yet, the time might be near when…

A key concept in science is molecular scale. DNA is a fascinating molecule in this regard. While we cannot “see” DNA molecules without the aid of advanced technology, a full length DNA molecule can be very long. In human cells, other than sperm and eggs, six billion base pairs of DNA are packaged into 22…

What Happens at the End?

Organisms with linear chromosomes have to solve the problem that DNA replication makes them shorter. This is due to the fact that DNA polymerase can only add bases to the terminal 3′-OH of a DNA chain. The DNA replication initiation complex uses RNA primers to provide the initial 3′-OH and to initiate “lagging” strand synthesis.…

The A, B, Z’s of DNA

Today (4/25) is national DNA day.  Digital World Biology™ is celebrating by sharing some of our favorite structures of DNA. We created these photos with Molecule World™ a new iPad app for viewing molecular structures. As we are taught in school, the double stranded DNA molecule is a right-handed helix as determined by Watson and Crick using…