Answer: 3.
- A 1
- B 2
- C 3
- D 4
Correct answer: C. 3
Explanation: There are three stop codons: UAA, UAG, and UGA. They do not code for any 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.