Answer: methyl guanosine triphosphate.
- A methyl guanosine triphosphate
- B a long poly-adenine tail
- C a single uracil residue
- D a methylated thymine base
Correct answer: A. methyl guanosine triphosphate
Explanation: An unusual methyl guanosine triphosphate cap is added to the 5 prime end of hnRNA, while a poly-A tail is added at the 3 prime end.
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.