THE MOLECULAR BASIS OF INHERITANCE
DNA REPLICATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Polymerase action site
|
|
|
Replication fork
|
|
|
Replication Origin
|
|
|
In the front
|
Detailed explanation-1: -DNA replication initiates at specific points, called origins, where the DNA double helix is unwound. A short segment of RNA, called a primer, is then synthesized and acts as a starting point for new DNA synthesis. An enzyme called DNA polymerase next begins replicating the DNA by matching bases to the original strand.
Detailed explanation-2: -Replication begins at a specific spot called the origin of replication or ori site. Bacterial DNA has a single origin of replication. On the other hand in eukaryotic DNA there are a number of origin of replication. Replication does not take place in the absence of the ori site.
Detailed explanation-3: -When replication starts, an origin of replication forms, consisting of two replication fork(s) moving in opposite directions. DNA double helix is separated into single strands by the enzyme DNA helicase. Newly-exposed, unreplicated DNA is protected by single-strand binding protein.