Question

QUESTION 15 RNA modification involves: O A. splicing B. 3' poly A tailing O C. 5' capping O D. all of the above

Answer 1

Question 15

the answer is (d) all of the above.

RNA modification involves three major steps: the addition of a 5’ cap, the addition of a 3’ polyadenylated tail and RNA splicing. Such processing is essential for the correct transalation of eukaryotic genomes because the initial precursor mRNA produced by transcription often contains both exons and introns. Splicing remove the introns and links the exons directly, while cap and tail facilitates the transport of mRNA to ribosome and protect it from molecular degradation.

Question 16

The contribution of 5’ capping is that it helps the mRNA exit the nucleus. It facilitates the transport of mRNA to ribosome. The cap also protects the 5’ end of the primary RNA from attack by ribonucleases.

Question 17

Translation is the process of making proteins. After DNA is transcribed into mRNA molecule during transcription, the mRNA must be translated to produce a protein. In translation, mRNA along with transfer RNA and ribosomes work together to produce proteins.

Question 18

Answer is True

The genetic code is the relation between the sequence of bases in DNA (or its RNA transcripts) and the sequence of amino acid proteins. Three nucleotide encode an amino acid and the code is non overlapping.