Question

2. Transcription can be divided into 3 main stages: initiation, elongation, and termination, List the role and key characteristics of each stage in transcription

Answer 1

Answer=

The process of transcription divided into three main stages:

key characteristics of each stage in transcription :

The transcription is the process of the synthesis of RNA from DNA.

Transcription completed in three stages:

1.Initiation = It is the first stage in transcription, during this stage,RNA polymerase binds to the promoter sequences of DNA. once RNA polymerase binds to promoter, there is unwinding of DNA strands takes place, providing template for RNA synthesis.

promoter is the sequence of DNA from where the process of transcription starts.

2.Elongation = during this stage there is addition pf nucleotide bases to the mRNA strand.RNA polymerase is main transcribing enzyme, which catalyses this step, it read the DNA molecule and forms the mRNA molecule by adding complementary base pairs to the DNA

molecule.

RNA polymerase uses the template DNA that is in direction 3'-5' ,and synthesizes mRNA in the 5' - 3' direction.

complementary base pairs are adenine in DNA binds to the uracil in mRNA, guanine in DNA binds to the cytosine in mRNA or vice versa.

3.Termination = this is the third stage in which there is transcription process ends when RNA polymerase reaches a termination sequence.the terminator sequences signals that the RNA transcript is complete.

The mRNA strand is complete and detaches from DNA.