Monday, April 30, 2012


Believe it or not there is more than one possible structure for DNA! There are three: A-DNA, B-DNA, and Z-DNA.


Z-DNA is a left handed double helix structure, which is the opposite of the most common form, B-DNA. There are also many other differences than the common form, such as base pairs per turn. The Z form has 12 bases per turn while the B form only has 10.5. The biological significance is still largely unknown but research is going on to determine it. Right now they think that it has something to do with supercoiling during DNA transcription. This will allow the DNA to open up and allow transcription factors to bind, allowing mRNA to be made and proteins to be created.

All in all, there isn't much known about Z-DNA. Scientists are working on it though!

So this is the last post for the A to Z Challenge. I can't believe that it's already over! May 7th is the date to write a reflections post on the challenge, to talk about pros and cons, what you liked most, what you didn't like, if you met anyone cool, stuff like that. Visit the A to Z Challenge site to learn more!


Hazel said...

Very cool, I quite like the well-known structure of DNA the most though!

EmptyNester said...

The thing I do like about science is that no matter how much we learn and discover, there's always so much more to be learned and discovered!

thespotts said...

I did not know about Z-DNA, so I have learned something very cool on this last challenge day. Thanks for sharing!

Lynda R Young said...

I had no idea!!
Great way to finish up the challenge. And my goodness, it WAS a challenge! ;)

Debra Harris-Johnson said...

Congrats on finishing the challenge. Great ending post!

Anna Smith said...

I didn't know there were 3 kinds,now I'm even more confused! :)