Answer: tRNA.
- A rRNA
- B tRNA
- C hnRNA
- D snRNA
Correct answer: B. tRNA
Explanation: Francis Crick proposed that tRNA acts as an adaptor molecule, reading the mRNA codon and carrying the corresponding amino acid.
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.