In Eukaryotic cell, transcription occurs in the nucleus and translation occurs in the cytoplasm. In Prokaryotic cell, transcription are coupled; that is, translation begins while the mRNA still is being synthesized.
Eukaryotic cell
Transcription and translation are partially separated in eukaryotic cell; transcription occurs in the nucleus to produce a pre-mRNA molecule.Transcription is the process in which DNA makes a copy of it self. Both DNA and RNA are nucleic acids, which use base of nucleotides as a complementary league to converted them self back and ford to RNA and DNA in the presence of the correct enzymes. During transcription, a DNA sequence is read by a RNA polymerase which, produce a complementary, anti parallel RNA stand. As opposite to RNA replication, transcription results in an RNA complement that includes Uracil (U) in all instances where Thymine (T) will occur in a DNA complement.
Transcription is the first step leading to gene expression. The sketch of DNA transcribed into a DNA molecule is called a transcription unit and end-codes at leats one gene. If the gene transcribed end- codes for a protein, the result of transcription is messenger mRNA, which will then be used to created that protein in the process of translation.
In Eukaryotic cell, mRNA synthesize in the nucleus and translated on ribosomes in the cytoplasm.
Translation
A protein-coding gene is transcribed into a pre-mRNA.
Pre-mRNA is process into a mature mRNA.
mRNA exits the nucleus.
mRNA is translated into to produce the polypeptide chain.
Prokaryotic Cell
Because their is no nucleus to separate the processes of transcription and translation, when bacterial genes are transcribed their transcripts can immediately be translated.
No comments:
Post a Comment