Which of the following steps in transcription is catalysed by RNA polymerase?

a)
Initiation

b)
Elongation

c)
Termination

d)
All of the above

Correct answer is option 'B'. Can you explain this answer?

Question

Which of the following steps in transcription is catalysed by RNA polymerase?a)Initiationb)Elongationc)Terminationd)All of the aboveCorrect answer is option 'B'. Can you explain this answer?

Answer

Answer should be elongation becz RNA polymerase bind transiently with sigma and rho factor it catylse only process of elongation

Answer

There is single DNA-dependent RNA polymerase that catalyses transcription of all types of RNA in bacteria. RNA polymerase binds to promoter and initiates transcription (Initiation). It uses nucleoside triphosphates as substrate and polymerises in a template dependent fashion following the rule of complementarity. It somehow also facilitates opening of the helix and continues elongation. Only a short stretch, of RNA remains bound to the enzyme. Once the polymerases reaches the terminator region, the nascent RNA fall off, so also the RNA polymerase. This results in termination of transcription. The RNA polymerase is only capable to catalysing the process of elongation. It associates transiently with initiation-factor (σ) and termination-factor (ρ) to initiate and terminate the transcription respectively. Association with these factors alter the specificity of the RNA polymerase to either initiate or terminate.

So, the correct answer is 'All of the above'.

Answer

Answer d bcz There is single DNA-dependent RNA polymerase that catalyses transcription of all types of RNA in bacteria. RNA polymerase binds to promoter and initiates transcription (Initiation). It uses nucleoside triphosphates as substrate and polymerises in a template dependent fashion following the rule of complementarity. It somehow also facilitates opening of the helix and continues elongation. Only a short stretch, of RNA remains bound to the enzyme. Once the polymerases reaches the terminator region, the nascent RNA fall off, so also the RNA polymerase. This results in termination of transcription. The RNA polymerase is only capable to catalysing the process of elongation. It associates transiently with initiation-factor (σ) and termination-factor (ρ) to initiate and terminate the transcription respectively. Association with these factors alter the specificity of the RNA polymerase to either initiate or terminate.

So, the correct answer is 'All of the above

Answer

According to me..RNA polymerase binds with promoter and hence initiation takes place

Answer

For elongation RNA polymerase III is used mainly and for initiation and termination other enzymes are used... and main enzyme of repair is RNA polymerase I

Answer

Answer

RNA polymerase binds with mRNA and initiates the process then as it comes to the stop codon RNA polymerase terminates the process
SO RIGHT ANSWER SHOULD BE (All of the above)

Answer

RNA polymerase is only capable of catalysing in elogation proces .it associate transiently with initiation and termination factor to initiate and terminate the transcription respectively

Answer

Elongation

Answer

B

Answer

RNA polymerase catalyse only elongation ...for initiation it require sigma factor and for termination require rho factor

Answer

Transcription:
Transcription is the process by which an RNA molecule is synthesized from a DNA template. It involves the synthesis of a messenger RNA (mRNA) molecule that carries the genetic information from the DNA to the ribosomes, where it is used as a template for protein synthesis.

Steps in Transcription:
Transcription consists of three main steps: initiation, elongation, and termination. These steps are catalyzed by the enzyme RNA polymerase.

Initiation:
- Initiation is the first step in transcription.
- RNA polymerase recognizes a specific DNA sequence called the promoter region, which is located upstream of the gene to be transcribed.
- The RNA polymerase binds to the promoter region and unwinds a small portion of the DNA double helix.
- This creates a transcription bubble, where the DNA template strand is exposed and available for base pairing with ribonucleotides.

Elongation:
- Elongation is the second step in transcription and is catalyzed by RNA polymerase.
- The RNA polymerase moves along the DNA template strand in the 3' to 5' direction, synthesizing an RNA molecule in the 5' to 3' direction.
- As the RNA polymerase moves along the DNA, it adds complementary ribonucleotides to the growing RNA chain, based on the sequence of the DNA template strand.
- The RNA polymerase maintains the unwound transcription bubble by breaking and reforming hydrogen bonds between the DNA strands.

Termination:
- Termination is the final step in transcription.
- It occurs when the RNA polymerase reaches a specific DNA sequence called the terminator.
- The terminator sequence signals the RNA polymerase to stop synthesizing RNA and release both the DNA template strand and the newly synthesized RNA molecule.
- The RNA molecule is then available for further processing and transport to the cytoplasm for translation.

Catalysis by RNA Polymerase:
- RNA polymerase is the enzyme responsible for catalyzing all three steps of transcription: initiation, elongation, and termination.
- During initiation, RNA polymerase binds to the promoter and unwinds the DNA double helix.
- During elongation, RNA polymerase moves along the DNA template strand and synthesizes an RNA molecule.
- During termination, RNA polymerase recognizes the terminator sequence and stops transcription.

Therefore, the correct answer is option 'B' - Elongation.

Answer

As per ncert the initiation takes place only by the binding of RNA polymerase on promoter region and then the hydrogen bonds r broken .RNA polymerase keep on adding nucleotide complimentarily .RNA polymerase moves forward.
So the correct ans is option (a).

Answer

D

Answer

All of above

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