The image shows the transcription process in which mRNA is being synthesized. DNA double strands open in the transcription bubble and RNA polymerase acts there to add the correct nucleotides.
<h3>What is transcription?</h3>
In protein synthesis, the first step is to synthesize messenger RNA, mRNA.
Transcription is the coping process of the DNA section, occurs inside the nucleus membrane, and uses fragments of DNA molecules to do it.
During transcription, the DNI molecule separates into two strands to form the transcription bubble. At this point, two strands can identify, the coding strand and the template strand.
- The coding strand goes in direction 5' to 3' and carries the same nucleotides as mRNA, except for thymine which is replaced by uracyl in the RNA molecule.
- The template -complementary- DNI strand is read in direction 3´→ 5´ to build the mRNA molecule in direction 5´→ 3´.
While growing, the mRNA strand complements the DNA template strand. Bases complementation is as follows,
- Adenine pairs DNA Thymine
- Uracyl pairs DNA Adenine
- Guanine pairs Cytosine
- Cytosine pairs Guanine
The enzyme RNA polymerase reads the original DNI strand to add the correct nucleotides during mRNA synthesis.
Once transcription is over, mRNA moves to the cytoplasm to begin the translation process.
In the image we can see
1) the DNA molecule at the left. We can differenciate the template strand from the coding one.
2) the transcription bubble and RNA polymerase acting there.
3) Growing mRNA which complements the template strand
4) Available free nucleotides which are added to the polymere
You can learn more about transcription at
brainly.com/question/9791055
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