NEET BIOLOGY

Detailed explanation-1: -As the DNA opens, two Y-shaped structures called replication forks are formed, together making up what’s called a replication bubble. The replication forks will move in opposite directions as replication proceeds.

Detailed explanation-2: -A replication bubble is an unwound and open region of a DNA helix where DNA replication occurs. Helicase unwinds only a small section of the DNA at a time in a place called the origin of replication. In eukaryotes, there are several origins of replication on each chromosome.

Detailed explanation-3: -To synthesize DNA, the double-stranded DNA is unwound by DNA helicases ahead of polymerases, forming a replication fork containing two single-stranded templates. Replication processes permit the copying of a single DNA double helix into two DNA helices, which are divided into the daughter cells at mitosis.

Detailed explanation-4: -DNA helicase is needed in order to open the DNA to expose the nucleotide bases that are used as the template for replicating the DNA. The area of the DNA that is opened by DNA helicase is known as the replication fork because it looks very similar to a fork in the road.