Here is the proof of how far we have come in science. Scientists from the United States for the first time were able to visually observe the process of doubling DNA of Escherichia coli, which turned out to be much more random than previously thought by biologists. Also, the researchers were able to record the process on video.
The DNA double helix consists of two intertwined strands of genetic material, which consists of nucleotides, the structural units of the DNA molecule. Each nucleotide in turn consists of phosphoric acid, five-membered sugar ribose and one of the nitrogenous bases: guanine, thymine, cytosine and adenine. It looks pretty simple, but this molecule is the basis of the transmission of hereditary material to the descendants of any living organism. However, transmission of DNA molecules descendants need to collect them. This process is called replication — doubling of the genetic material (DNA) for subsequent cell division.
This process begins with the joining of DNA specific enzyme — helicase, which unwinds and unzips the double helix into two single strands. Then in the case enters a DNA polymerase, which attaches to the specific DNA region of the primer and adds additional nucleotides for the formation of a new double helix.
Previously, scientists assumed that the DNA polymerase on the parallel DNA strands somehow coordinate with each other throughout the replication process. But in the video you can see that that each of the strands is replicated independently from each other.