Answer: Over 90%.
- A About 10%
- B About 50%
- C Over 90%
- D Almost 0%
Correct answer: C. Over 90%
Explanation: More than 90% of the human genome is made up of non-coding DNA sequences, once referred to as junk 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.