hit counter joomla

DNA

Tag archives for DNA

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…

Some people, like Imelda Marcos and our new Dr. Isis, have a thing for fancy shoes. I go crazy for gadgets. technorati tags: iphone, DNA, molecules, molecular structure, molecular modeling, Science education For my birthday this year, my family bought me a new iPhone! Yeah! So, I’ve been killing several hours today filling it with…

I got my copy of “A short guide to the human genome” by Stewart Scherer today from Cold Spring Harbor Laboratory Press (2008, ISBN 978-087969791-4). Usually, I would wait until after I’ve read a book to write a review, but this book doesn’t require that kind of study. As soon I skimmed through it and…

My funny Valentine

Believe it or not, this is a DNA kiss.

Last year I wrote about an experiment where I compared a human mitochondrial DNA sequence to primate sequences in the GenBank. Since I wanted to know about the differences between humans, gorillas, and chimps, I used the Entrez query ‘Great Apes’ to limit my search to a set of sequences in the PopSet database that…

One of my readers asked: Why does genome sequencing cost so much? My short answer is because it’s big. But I thought it would be fun to give a better answer to this question, especially since I’m sure many of you are wondering the same thing. Okay, so let’s do some math. Don’t worry, this…

If you’ve read any of the many stories lately about Craig Venter or Jim Watson’s genome, you’ve probably seen a “SNP” appear somewhere. (If you haven’t read any of the stories, CNN has one here, and my fellow bloggers have posted several here, here, here, here, here, and here.) You may be wondering, and rightly…