Question

1.What makes up the spliceosome? What is the function of the spliceosome?

2.What is RNA editing? Explain the role of guide RNAs in RNA editing.

3.How do the mRNAs of bacterial cells and the pre-mRNAs of eukaryotic cells differ? How do the mature mRNAs of bacterial and eukaryotic cells differ?

4.Draw a typical eukaryotic gene and the pre-mRNA and mRNA derived from it. Assume that the gene contains three exons. Identify the following items and, for each item, give a brief description of its function:

a.5' untranslated region

b.Promoter

c.AAUAAA consensus sequence

d.Transcription start site

e.3' untranslated region

f.Introns

g.Exons

h.Poly(A) tail

i.5' cap

5.A geneticist discovers that two different proteins are encoded by the same gene. One protein has56 amino acids, and the other has 82 amino acids. Provide a possible explanation for how the same gene can encode both of these proteins.

Answer 1

1)The RNA that is produced from the transcription is called as the heteronuclear RNA in case of eukaryotes . Heteronuclear RNA contains both coding and non coding sequences . Coding sequences are known as exons and the non coding sequences are known as introns. The non coding sequences removal are very necessary for the process of translation that is used for the production of proteins. The heteronuclear RNA is converted into mRNA in the post transcriptional changes . The introns that is removed in the splicing process are known as spliceosomes. Spliceosomes are a group of RNA and proteins that play an important role in the removal of non coding sequences called introns which is very important for the process of protein formation in eukaryotes. If the spliceosome do not remove the introns sequence then the protein that is formed source different amino acids having a mutated functions which is is very dangerous for the gene expression.

Have a beautiful day

Hit a Thumbs Up