Answer: a pentose sugar.
- A a phosphate group only
- B two phosphate groups
- C a base and a phosphate
- D a pentose sugar
Correct answer: D. a pentose sugar
Explanation: A nucleoside consists of a nitrogenous base linked to a pentose sugar; adding a phosphate group converts it into a nucleotide.
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.