DNA Replication

A eukaryotic cell lacking helicase during DNA replication would

• be unable to proofread the newly synthesized strand
• would make the DNA strands at incorrect locations
• be unable to unwind the DNA helix

During DNA replication, the leading strand is easily distinguishable from the lagging strand because

• Helicases only attach to the leading strand
• the lagging strand is synthesized in separate pieces called Okazaki fragments
• DNA ligase is attached to the leading strand

The primer that initiates DNA synthesis is composed of

• 5 RNA nucleotides
• 1 water codon
• 1 DNA nucleotide

Which of the following sequences expresses the correct order of enzyme function in DNA replication?

• Helicase--primase--DNA polymerase--ligase
• ligase--helicase--primase--DNA polymerase
• DNA polymerase--primase--helicase--ligase