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 Cell Tissue Gene DNA Mitosis Meiosis |
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Cell Tissue Gene DNA Mitosis Meiosis |
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  10:18 | 0 Cloud(s) Transcription
Transcription :
*Process where the information in DNA is transcribed to a RNA molecule (mRNA)
*Occur in the nucleus
*Single strand of DNA act as as a template
*Only part of DNA will be copied
*Direction : 5’ 3’
*Catalaysed by RNA polymerase
Initiation
*RNA polymerase binds to DNA at a specific sequence of nucleotides called the promoter
*The promoter contains an initiation site where transcription of the gene begins
*RNA polymerase than unwinds DNA at thebeginning of the gene
Elongation
*Only one of the unwound DNA strands acts as a template for the RNA synthesis
*RNA polymerase can only add nucleotids to the 3' end of the strand so like DNA, RNA must be synthesized in the 5' to 3' direction
*Free ribonucleotides from the cytoplasm are paired up with their complementary base on the exposed DNA template
*RNA polymerase joins the ribonucletides to form mRNA strand
*The DNA that has been transcribed, re-winds to form a double helix
Termination
*RNA polymerase continues to elongate until it reaches the terminator, a specific sequence of nucleotides that signals the end of transcription
*Transcription stops and mRNA polymerase and the new mRNA transcript are released from DNA. DNA double helix reforms
Animation : Transcription Process
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