Answer: Basic amino acids.
- A Acidic amino acids
- B Basic amino acids
- C Sulphur-containing amino acids
- D Aromatic amino acids
Correct answer: B. Basic amino acids
Explanation: Histones are rich in basic amino acids like lysine and arginine, giving them a net positive charge that lets them bind the negatively charged DNA.
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.