Answer: aminoacyl-tRNA synthetase.
- A peptidyl transferase enzyme
- B aminoacyl-tRNA synthetase
- C an RNA-dependent polymerase
- D reverse transcriptase enzyme
Correct answer: B. aminoacyl-tRNA synthetase
Explanation: Aminoacyl-tRNA synthetases charge each tRNA with its specific amino acid, a step called aminoacylation that activates the amino acid for translation.
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.