My guess is that you're thinking of DNA polymerase.
DNA helicase is the enzyme responsible for separating the strands of DNA during processes such as DNA replication and transcription. It unwinds the double helix structure of DNA by breaking hydrogen bonds between the complementary base pairs.
DNA ligase
A Retsriction enzyme endonuclease is an enzyme that is used to cut DNA strands (both single and double strands) during finger printing at the DNA recognition sites known as restriction sites.
Ligase is used to join DNA strands together
the enzyme Lactase will enclose the single strands of DNA
Scientists use an enzyme called restriction enzyme to cut genes out of strands of DNA.
DNA helicase is the enzyme responsible for separating the strands of DNA during processes such as DNA replication and transcription. It unwinds the double helix structure of DNA by breaking hydrogen bonds between the complementary base pairs.
ligase
DNA ligase belongs to the field of molecular biology, specifically enzyme biology. It plays a crucial role in the process of DNA replication and repair by catalyzing the formation of phosphodiester bonds between DNA strands.
The enzyme that separates the two strands of DNA to start the replication process is called helicase.
Assuming this is regarding DNA replication or transcription, the enzyme helicase separates the two strands.
DNA polymerase
DNA ligase
RNA polymerase is the enzyme that binds to the DNA promoter region and separates the DNA strands during transcription. It then synthesizes an mRNA molecule using one of the strands as a template.
A Retsriction enzyme endonuclease is an enzyme that is used to cut DNA strands (both single and double strands) during finger printing at the DNA recognition sites known as restriction sites.
Ligase is used to join DNA strands together
the enzyme Lactase will enclose the single strands of DNA