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Transcription and translation in bacteria can be coupled

In eukaryotes, transcription occurs inside nucleus and translation occurs in cytoplasm. But in case of prokaryotes like bacteria as there is no nucleus present, along with translation, transcription also occurs in cytoplasm and both the processes can be go simultaneously. For this reason it is said that ‘transcription and translation in bacteria can be coupled’.

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Bacteria dividetoo fast. E. coli divides every 20 minutes. So no wonder they have to perform all reactions fast. Although they have quite few genes in comparision to a normal eukaryotic cell, which means cell division can be faster as DNAReplication is faster (also, bacteria possess some of the most stable forms of DNAPolymerase which works even around 80 C = used in PCRReactions) but in their case, quite often, transcription and translation can be coupled to conserve time, meaning like the DNAis transcribed to RNAand even before the transcription is complete (i.e. the RNAStrand isn't fully formed), translation can start of the RNAformed even if transcription of the DNA is still going on. So this increases the speed of biological reactions and consequently, they have a small division and growth time (small 15 min interphase, but still nearly all required proteins formed and used up during division). Hope that helps!! :-)

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