Answer: Removal of introns and joining of exons.
- A Addition of a poly-A tail at the 3 prime end
- B Addition of a methyl guanosine cap at the 5 prime end
- C Removal of introns and joining of exons
- D Conversion of mRNA back into DNA
Correct answer: C. Removal of introns and joining of exons
Explanation: Splicing is the removal of non-coding intron sequences from hnRNA and the joining of coding exons to form mature mRNA.
Helicase unwinds the double helix at the replication fork; one new strand (leading) is synthesised continuously toward the fork, while the other (lagging) must be made in short, separate Okazaki fragments because DNA polymerase only adds nucleotides 5'→3'.
Concept context
DNA structure, replication, transcription, translation, the genetic code, and gene regulation (lac operon). The single most important chapter for NEET molecular biology.