12.27.09
DNA Replication
This is a clip from a PBS production called “DNA: The Secret of Life.” It details the latest research (as of 2005) concerning the process of DNA replication. Google search the PBS title and you can find the website which has links to many informative sites and interesting clips. This is just a segment detailing replication. A Windfall Films Production for Thirteen/WNET New York in association with Channel Four. © 2003 Educational Broadcasting Corporation.
November 22nd, 2009 at 6:16 pm
all species do it the same
November 23rd, 2009 at 11:26 am
Awesome video! I could watch it over and over again!
November 26th, 2009 at 12:09 am
Everything alive.
December 1st, 2009 at 10:42 pm
man, i wished they slowed down the animation. That was way too fast for me to take it in.
December 2nd, 2009 at 4:14 am
Stellar
December 2nd, 2009 at 9:06 pm
Cool!
December 3rd, 2009 at 4:19 pm
???
It could be any eukaryote, AFAIK.
December 3rd, 2009 at 4:24 pm
lol @ theists treating “atheists” (non-religion) as a relgion.
December 3rd, 2009 at 7:49 pm
doesn’t go in depth about polymerase, ligase etc.. not very helpful when seeing as i’m studying this! argh
December 6th, 2009 at 10:05 am
OK.. what I don’t understand (and if somebody can explain me) is how all these molecules appear always at the right time so that the process continuously works and doesn’t stop. Are those molecules alives and thinking entities???? How do they always appear and bind to each other in the right moment?
December 7th, 2009 at 2:55 am
They’re unable to think. Remember: a brain is required to think. Cells may seem intelligent, but they’re just preprogrammed chemicals that respond the same way everytime (kind of like how sugar always melts in water, and how steam always rises instead of falling. They don’t think, it just happens).
The molecules work because they’re shaped correctly. I can’t say for sure how it happens, but chemical signals induce the chemicals to bind/do their job at the right time.
December 7th, 2009 at 9:17 pm
this is really cool but is quite hard to comprehend. (the animation that is, not the actual replication).
December 8th, 2009 at 4:29 pm
where can you get such music?
December 9th, 2009 at 10:22 am
I’ve a theory in my head.
not all molecules appear always at the right time. all molecules ” appropriate or not ” will meet this “machine” by brownian “zig zag” movement. but only a molecule with the appropriate ” shape” would fit to this machine.
so, there is no appropriate time needed. only appropriate shape
it is like try and error
again. i’m not specialized, but i thought of that question long time ago.
December 11th, 2009 at 10:56 pm
So, eventhough these 3D animations show huge empty spaces and molecules coming in to the place and then going away, in real life this would be more like a box fill with balls hitting each other at very high speed, then at some point ball A will hit ball B oand cause the right reaction? Then, the cell works based on the assumption that there’s high probability that any pair of chemicals will interact at some point?
December 13th, 2009 at 3:43 pm
JUST ONE WORD WOW
December 15th, 2009 at 4:06 pm
WOW!!!!
December 15th, 2009 at 5:20 pm
metralios is quite right in his explanation. However, this reaction is only initiated when a cell needs to reproduce itself. Therefore, there is a right time for this reaction to happen. To control the timing, the cell adds an inhibitor (like an on/off switch) to the machine so the replication doesn’t occur when it’s not supposed to. An other chemical signal will remove the inhibitor when the cell the replication. This can get really complicated. There are often a lot of control molecule (switch
December 15th, 2009 at 5:25 pm
Most thing alive uses the same processus for replication. See from an evolutive point of view. Everything that lives has dna. for something to be alive, it must replicate dna in order to reproduce itself (reproduction is part of what defines life). So for life to happen, dna was first invented and then something to replicate it so life would last. although the molecule might not be exactly the same, the replication process is very similar for all species.
December 20th, 2009 at 3:00 am
is that murphey brown?
December 23rd, 2009 at 11:59 pm
except for the nitrogen bases which makes each and every organism different the WAY the adenin matches with thymine, and guanine matches with cytosine.
December 24th, 2009 at 12:25 pm
Yes, the lenght of dna and number of chromosomes may vary from specie to specie and the sequences of nitrogen bases is very different even among the same specie, but the enzymes in charge of replication of the Dna are very similar for every living organism. The shape of the enzyme is not exactly the same and the sequence of amino acids may differ, but its very similar from one organism to another.
December 24th, 2009 at 2:39 pm
yepp, and im just a seventh grader:) teehee
December 24th, 2009 at 2:42 pm
i live ear the town in which the first real molecule of dna was first made by james watsion and crick. i went to a camp where its near the coldspring harbor labratories are, and on display there, they display the first real molecule. its a sshame, that rosalind franklin never really got any credit for the exray in which they found out that deoxyribonucleicacid was a double helix
December 26th, 2009 at 9:34 pm
back engineering is the greatest form of flaterey