Respuesta :
Answer:
sequence c
Explanation:
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Transcription is the process of mRNA synthesis. It occurs in the nucleus before translation. During transcription, RNA bases pair DNA bases, replacing Thymine with Uracyl. You will find the example in the explanation.
Note: The DNA sequence is missing, so I will provide a new sequence and explain the procedure. I suggest you perform the same steps with your molecule fragment and reach the correct mRNA.
Protein synthesis
- Proteins synthesis is done in two stages: transcription and translation.
- The whole process begins in the nucleus and finishes in the cytoplasm.
- Protein synthesis initiates in the AUG start codon -Metionin-, and ends when reaching either of the stop codons UAA, UAG, UGA.
- Once the new molecule is completed, it is sent to its final destiny.
Transcription:
- The first step before protein arrangement is to synthesize messenger RNA, mRNA.
- This is the transcription process and occurs in the nucleus.
- When the DNI molecule separates into two strands to form the transcription bubble, we can identify two separate segments: coding strand and template strand.
- The coding strand goes in direction 5' to 3', while the complementary strand -template strand- grows in direction 3' to 5'.
- This last segment is the one that is going to be complemented by the mRNA. It is the template strand.
- A template DNI strand is read in direction 3'→ 5' to build the mRNA molecule that grows in direction 5'→ 3'.
- During transcription bases forms pairs. RNA replaces Thymine with Uracyl, so pairs are as follows,
DNA mRNA
- Adenine pairs Uracyl,
- Thymine pairs Adenine,
- Guanine pair Cytosine,
- Cytosine pair Guanine.
Translation:
- Translation occurs in the cytoplasm.
- During translation, rRNA reads mRNA in 5' to 3' direction, and tRNA adds the correct amino acid to the growing chain.
- The first extreme to be translated carries the amino-terminal group, while the other extreme carries the carboxy-terminus group.
Example
We will consider for this example the following DNA template strand.
DNI strand ⇒ 5'-TAGAACGCCTCGAAATTTCATACT-3'
- Transcription
template DNI strand ⇒ 5'-TAGAACGCCTCGAAATTTCATACT-3'
mRNA ⇒ 3´-AUCUUGCGGAGCUUUAAAGUAUGA- 5´
The new mRNA strand is
mRNA ⇒ 3´-AUCUUGCGGAGCUUUAAAGUAUGA- 5´
Once the mRNA synthesis is over, the molecule leaves the nucleus and proceeds with translation in the cytoplasm.
You can learn more about transcription at
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