How often and why do the DNA replicate?
The typical human chromosome has about 150 million base pairs that the cell replicates at the rate of 50 pairs per second. At that speed of DNA replication, it would take the cell over a month to copy a chromosome. The fact that it takes only one hour is because of multiple replication origins.
Is required for DNA replication to occur?
New DNA is made by enzymes called DNA polymerases, which require a template and a primer (starter) and synthesize DNA in the 5′ to 3′ direction. DNA replication requires other enzymes in addition to DNA polymerase, including DNA primase, DNA helicase, DNA ligase, and topoisomerase.
When and where does replication occur?
Replication occurs in the nucleus during the S phase of the cell cycle in eukaryotes, and replication occurs continuously in prokaryotes.
What are the five steps of DNA replication?
The viral replication involves five steps. They are : 1. Attachment 2. Penetration 3. Uncoating 4.Replication, transcription and translation, 5. Assembly and Release from host cell.
What is the third step in DNA replication?
Third Step of DNA Replication. DNA Polymerase moves along the DNA strands attaching free floating nucleotides to the open strands.
Which model of DNA replication is correct?
After Watson and Crick proposed the double helix model of DNA, three models for DNA replication were proposed: conservative, semiconservative, and dispersive. The semiconservative model was proved to be the correct one.
How do you replicate a DNA sequence?
In general, DNA is replicated by uncoiling of the helix, strand separation by breaking of the hydrogen bonds between the complementary strands, and synthesis of two new strands by complementary base pairing. Replication begins at a specific site in the DNA called the origin of replication.