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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance4 Marks
Question
What is the difference between transcription in prokaryotic and eukaryotic cells? Compare.
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Answer

Differences between transcription in prokaryotic and eukaryotic cells :
S.No.Prokaryotic TranscriptionEukaryotic Transcription
1It occurs in contact with cytoplasm.It occurs inside the nucleus.
2There is no specific period for its occurrence.Major part of transcription occurs in $G _1$ and $G _2$ phases
3Processing of released RNA occurs in cytoplasm.Processing occurs inside the nucleus.
4It is coupled to translation.Transcription and translation are spacially separate.
5Products of transcription become effective in situ.Products of transcription come out of the nucleus for functioning in cytoplasm.
6There is only one RNA polymerase.There are three types of RNA polymerases.
7RNA polymerase does not have separate transcription factors.Transcription factors are involved in recognition of promoter site.
8An enhancer is usually absent.An enhancer may be present alongwith promoter.
9mRNA is generally polycistronic.mRNA is generally monocistronic.
10Splicing is generally not required.In most of the cases splicing is required for removing intervening sequences.

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