In eukaryotic transcription
(A) RNA polymerase II is responsible for the transcription of hnRNA
(B) The transcription factors recognise the promoter
(C) The core promoter determines the frequency of initiation
(D) Transcription termination by genes transcribed by RNA polymerase I are similar to rho-dependent prokaryotic termination

Choose the correct option

A, B, and D

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A, C, and D

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A, B, and C

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B, C, and D

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Solution

The correct option is A A, B, and D
Transcription in eukaryotes is initiated with the help of transcription factors responsible for recognising the promoter, to which the RNA polymerase binds, which determines the transcription start point. The sequence elements upstream of the core promoter influence the frequency of initiation.

In eukaryotes, transcription termination is different for different RNA polymerases. RNA polymerase I transcription termination is similar to rho-dependant termination in prokaryotes. The ribosomal rRNA genes transcribed by RNA Polymerase I contain a specific sequence of base pairs that is recognized by a termination protein called TTF-1. This is similar to the rho-dependent termination in prokaryotes.

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Similar questions

The paragraph below gives a description about transcription. Which is the correct description among them? (a) Enzyme involved in transcription is RNA polymerase-II, which consists of 5 polypeptides α, β, β’, σ and ω. Core enzyme recognizes promoter site while σ factor takes part in chain elongation. (b). Initiation starts with help of core enzymes of RNA polymerase enzyme. (c) Elongation is done by σ factor, which moves along the sense strand. (d) In prokaryotes, termination is done by rho factor while in eukaryotes; poly A tail is responsible for termination at 3’.

Q. Read the following statements and choose the correct option.
1. RNA polymerase associates transiently with ‘Rho’ factor to initiate transcription.
2. In bacteria transcription and translation takes place in the same compartment.
3. RNA polymerase I is responsible for transcription of tRNA.
4. When hnRNA undergoes capping process, adenylate residues are added at 3’ end in a template independent manner.
5. hnRNA is precursor of mRNA

Q. In prokaryotes, holoenzyme RNA polymerase attaches to the DNA sequence at the promoter site of template DNA during transcription. The sequence of that point where the RNA polymerase binds is:

Q. explain the role of DNA dependent RNA polymerase in initiation,elongation and termination during transcription in bacterial cell

Q. Which of the following comparisons of prokaryotic transcription and eukaryotic transcription is incorrect?

	Prokaryotic transcription	Eukaryotic transcription
(a)	Transcriptional unit has only one gene	Transcriptional unit has one or more genes
(b)	Occurs in the cytoplasm	Occurs in the nucleus
(c)	A single RNA polymerase synthesises all the three types of RNA	The RNA polymerase I, II and III synthesise rRNA, mRNA and tRNA respectively
(d)	Coupled-transcription translation is the rule	Coupled transcription translation is notpossible

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