topic: transcription Can someone please help me answer the questions above and e

Question

topic: transcription

Can someone please help me answer the questions above and explain why did you pick that answer?

Thanks

Given that the RNA polymerase rate is between 20 to 50 nt/s, what number below is the best estimate for how many total supercoils do the gyrases need to change around the transcription bubble? In eukaryotes, RNA Polymerase III, RNA Polymerase I, and RNA Polymerase II transcribes ... In eukaryotes, post-transcriptional modifications of RNA In eukaryotes, transcription and translation ...

Explanation / Answer

1)Answer is 6 per second

Each supercoil will have 10.6 base pairs and nucleotide addition will takes place at a very fast rate than the unwinding. Approximately the gyrase need to change 6 supercoils per second.

2)Answer is C

In eukaryotes, RNA polymerase III transcribes t RNA

In eukaryotes, RNA polymerase I transcribes rRNA

In eukaryotes, RNA polymerase II transcribes mRNA

3)Answer is A

In eukaryotes, post transcriptional modifications of RNA involves trimming, methylation and addition

During RNA processing, it undergoes, 5’ capping, 3’ polyadenylation and RNA splicing.

In 5’ processing, during capping 7-methylguanosine is added to the 5’ end. In 3’ processing, the adenine residues are added to form poly(A) tail.

4)Answer is B

In eukaryotes, transcription and translation occurs separately in different organelles.

Transcription takes place in the membrane bound nucleus, whereas the translation takes place outside the nucleus in the cytoplasm. In eukaryotes, it is one of the mechanism through which it regulates the gene expression in much more intricate way.

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