Answer: Thymine.
- A Guanine
- B Cytosine
- C Thymine
- D Uracil
Correct answer: C. Thymine
Explanation: Adenine pairs with Thymine through 2 hydrogen bonds; Guanine pairs with Cytosine through 3 hydrogen bonds.
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.