Answer: mutation.
- A mutation
- B translation
- C transcription
- D replication
Correct answer: A. mutation
Explanation: A mutation is a change in the DNA sequence, a source of variation.
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.