AP BIOLOGY

Detailed explanation-1: -Thus, the DnaB helicase unzips the dsDNA in a reverse process to the zipping mechanism of the non-enzymatic double helix formation.

Detailed explanation-2: -During DNA replication, DNA helicases unwind DNA at positions called origins where synthesis will be initiated. DNA helicase continues to unwind the DNA forming a structure called the replication fork, which is named for the forked appearance of the two strands of DNA as they are unzipped apart.

Detailed explanation-3: -Key enzyme involved in DNA replication, it is responsible for ‘unzipping’ the double helix structure by breaking the hydrogen bonds between bases on opposite strands of the DNA molecule.

Detailed explanation-4: -During replication, the helicase has to unwind a long stretch of DNA, and that requires the helicase to couple strand-separation activity to translocation. The mechanisms of these critical processes of the helicase reaction are largely unknown.

Detailed explanation-5: -This separated, independent structure with all base pairs unzipped is called ssDNA. The DNA unzipping and the DNA unwinding result in a structural transformation from dsDNA to ssDNA.