DNA Replication
Which of the following enzymes unwind short stretches of DNA helix immediately ahead of a replication fork?

DNA polymerases
Helicases
Topoisomerases
Single-stranded binding proteins

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DNA Replication
The replication of chromosomes by eukaryotes occurs in a relatively short period of time because

the eukaryotic replication machinery is 1000 times faster than the prokaryotes
each chromosome contains multiple replicons
eukaryotic DNA is always single stranded
the eukaryotes have more amount of DNA for replication

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