Answer: tRNA, 5S rRNA and snRNAs.
- A the precursor of mRNA (hnRNA)
- B ribosomal 28S and 18S rRNA
- C tRNA, 5S rRNA and snRNAs
- D all three classes of RNA
Correct answer: C. tRNA, 5S rRNA and snRNAs
Explanation: RNA polymerase III transcribes tRNA, 5S rRNA and small nuclear RNAs, while Pol I makes large rRNAs and Pol II makes the mRNA precursor.
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.