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try this link tooo.........
DNA replication is a multistep complex process. yet it occurs within our body every second with a break neck speed of 500 - 5000 nucleotides per minute.
DNA is tightly bound in a double helix form. To replicate, first its unwinding is needed. This is achieved by enzymes called helicases, Helicases are so essential to replication that their absence leads to so many errors in replication which manifests as dozens of unrelated cancers in the body, the condition is called bloom syndrome.
the both strands of DNA now act as two templates on which two new strands of DNA will be formed.
Next step is to form a small RNA segment which will serve as a starting point for the replication. DNA synthesis cannot proceed unless this small RNA primer is formed.
Once this is achieved, DNA polymerases do rest of the work. They pick up correct nucleotides, and attach them together to form a perfect complimentary strand to the template. It is worthy to remember that new nucleotides are added only to the 3' end of the strand that is being formed, which means that the template strand will be read 3'-->5' direction and new strand will be formed 5'--->3' direction.
DNA polymerases also have inbuilt proof reading mechanism which detect and correct any mistakes that have occured in the process of transcription.
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here's a good link for a visual representation: It's in ppt format so its comprehensive ^_^
mercury.bio.uaf.edu/~kevin_mccracken/genetics/.../chapter_03.ppt - Similar
The process of DNA replication is much more complex than what i have tried to explain here. Much more details need to be studied accordingly. I have just tried to give you a overall idea of the sequences that occur.
UMM. INTERESTING...WELL FIRST ENZYMES SPLIT UP THE DOUBLE HELIX FORM OF THE DNA AND KEEP THEM THAT WAY. SINCE THERE ARE FREE NUCLEOTIDES IN THE CELL, THE DNA POLYMERASE, WHICH IS AN ENZYME, ATTACHES THE NUCLEOTIDES BASES TO ITS COMPLIMENTARY PARTNER ON THE SINGLE STRANDED DNA ACCORDING TO THE BASE PAIRING RULE..WHICH IS GUANINE=CYTOSINE AND ADENINE=THYMINE...DUE TO THE HYDROGEN ATTRACTION BTW THE BASE PAIRS, THEY "STICK" TOGETHER. WELL OFCOURSE WE HAVE THE LAGGING AND LEADING STRAND...LAGGING STRANDS ARE IN OKAZAKI FRAGMENTS WHICH IS JOINED TOGETHER BY DNA LIGASE....TO SAVE THE COMPLICATION, THE TWO UNWINDED STRANDS EACH IS GIVEN ITS TWIN STRAND THROUGH DNA POLYMERASE...OFCOURSE THEY CAN ONLY ATTACH NUCLEOTIDE BASES IN THE 3-5 DIRECTIONS ON THE STRANDS.. AND ANY GAPS BTW THE ADDED NUCLEOTIDE BASES ARE AMENDED BY THE DNA LIGASE..I HOPE THIS HELPED
DNA polymerase adds nucleotides in 5' --> 3' direction in the new strand
SRY BOUT THAT, 5-3.UR RIGHT
READ THIS SIR....http://wiki.answers.com/Q/What_do_centrioles_do