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This unzipping takes place in both directions from the replication origins, creating a replication bubble. The replication is therefore said to be bi-directional. Once the two strands are separated a small piece of RNA, called an RNA primer, is attached to the DNA by an enzyme called DNA primase. These primers are the beginnings of all new DNA chains since the enzyme responsible for the copying of the DNA, DNA polymerase, can not start from scratch.
This part becomes the message sent to the protein factories of the cell. It is called Messenger RNA (mRNA). mRNA is created using base pairing. Transcription When DNA unzips for protein synthesis, only the needed genes unzip. mRNA nucleotides base pair with the DNA bases.The bases of mRNA are the same as those of DNA except the T is replaced by U (uracil).his part becomes the message sent to the protein factories of the cell. It is called Messenger RNA (mRNA). mRNA is created using base pairing. Transcription When DNA unzips for protein synthesis, only the needed genes unzip. mRNA nucleotides base pair with the DNA bases.