Question

What process occurs during transcription?
A. Copying of DNA to form an mRNA strand
B. Synthesis of proteins that are coded for by mRNA
C. Replication of DNA to produce a complementary DNA strand
D. mRNA folding up by forming complementary bonds with itself

Answer 1

Answer is C


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Answer 2

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The precursor of mRNA transcribed by RNA polymerase-|| it is called heterogeneous nuclear RNA .It undergoes following processing to form nascent mRNA :-

1)Splicing:- In this process the non-coding introns are removed and coding sequences call exons are joined in a definite order .This is required because primary transcript contains both introns and exons .

2)Capping:- In this process an unusual nucleotide is added to the 5' end of hnRNA.

3)Tailing:- In this process 200 to 300 adenylated residues are added at the 3' endof hn RNA .

4)The fully process mRNA is released from the nucleus into the cytoplasm for translation .

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