Answer: Most amino acids are specified by more than one codon.
- A Some codons fail to correspond to any specific amino acid residue
- B Most amino acids are specified by more than one codon
- C The genetic code differs noticeably between different organism lineages
- D Codons physically overlap with each other along the mRNA strand
Correct answer: B. Most amino acids are specified by more than one codon
Explanation: Degeneracy means that most of the 20 amino acids are coded by more than one codon, for example leucine and serine each have 6 codons.
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.