IB Biololgy 11 (Diploma Programme)




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Reminders From Mr. Caine:



Current Unit of Study:

Biotechnology

Current Homework Assignments:



Upcoming Tests:

Final Exam (year 1)



Notes:


Link to the site where the virtual DNA fingerprinting lab can be downloaded: http://ceprap.ucdavis.edu/Software/VDNA/vdna.cfm

See Notes Archive page for previous unit notes

General Resources:

Loveland IB Wikispace: http://lovelandib.wikispaces.com/
Nature Podcast (updated): http://www.nature.com/nature/podcast/index.html
The Naked Scientists Podcast: http://www.thenakedscientists.com/HTML/podcasts/
Lab Write: http://www.ncsu.edu/labwrite/
(Use this Lab Write site to help you write up your labs in a professional manner)
Biocoach: http://www.phschool.com/science/biology_place/biocoach/index.html
Biology Animations: http://science.nhmccd.edu/biol/ap1int.htm
Science News: http://www.sciam.com/channel.cfm?chanId=sa022 & http://sciencenow.sciencemag.org/


Useful Documents:






external image msword.png Scientific Article Review.doc


Article of the Week:__

Taken from: http://discover8.com/article/Proteins_that_read_DNA_backwards_0



Proteins that read DNA backwards


Some enzymes transcribe DNA in the "wrong" direction, creating puzzling RNAs.

Over the past decade, biologists have learned to credit RNA with more respect than it once garnered. Previously thought of simply as a chemical intermediate between DNA and protein, a host of RNA oddities that can switch genes off and on has revised that view.

Now, a suite of papers published in Science this week promises to add still more complexity by revealing several new classes of peculiar RNA molecules, many of which are created when proteins read DNA backwards.

DNA is transcribed into RNA by enzymes called RNA polymerases. Some of these RNA molecules will then be used as a template to create proteins, whereas others act directly to affect processes in the cell. RNA polymerases sometimes latch onto a bit of DNA called a promoter, which is generally found in front of genes and contains important sequence information that can influence when and where a gene is expressed. The polymerase then travels along the DNA strand as it transcribes RNA.

Sometimes, however, a polymerase will move in the opposite direction, creating what is known as an antisense molecule of RNA. Some antisense RNAs can interfere with the function of its 'sense' partner, providing a way to regulate gene expression.



Last Updated by cainej: 3/03/09