Transcription is the copy process of a segment of the DNA template strand to produce mRNA. The<u> blue</u> segment is DNA, and the<u> yellow </u>segment is mRNA.
<h3>What is transcription?</h3>
The first step before protein arrangement is to synthesize messenger RNA, mRNA.
Transcription is the synthesis of the messenger RNA, mRNA. This event occurs in the nucleus and uses fragments of DNA molecules to do it.
When the DNI molecule separates into two strands to form the transcription bubble, we can identify two separate segments: the coding strand and the template strand.
- The coding strand goes in direction 5' to 3',
- The complementary strand -template strand- grows in direction 3' to 5'.
The template strand is the one that is going to be complemented by the mRNA. RNA polymerase is in charge of reading the original DNI strand for mRNA synthesis.
mRNA molecule grows complementing DNA base sequences. This is,
<u> DNA mRNA </u>
adenine ⇔ uracil
guanine ⇔ cytosine
thymine ⇔ adenine
<u>cytosine ⇔ guanine </u>
Once mRNA synthesis is over, the molecule leaves the nucleus to start the transcription process in the cytoplasm.
Answer:
- The blue segment is DNA molecule
- The yellow segment is mRNA molecule
1- DNA molecule
2- Separation of the DNI molecule into two strands and mRNA molecule growing.
3- mRNA molecule already synthesized and separated from DNA
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