What unwinds and unzips a DNA molecule?

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Helicase an enzyme that causes the DNA strands to unzip and unwind by breaking the weak hydrogen bonds between the complementary bases
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What occurs when a molecule of Dna is unzipped?

One double stranded Dna molecule is separated into two single stranded Dna molecules. A large multitude of bioprocess possibilities subsequentially present themselves!

What happens when a molecule of DNA unzips?

DNA splits, and mRNA and tRNA are there to create new strands for the new replicated DNA strand. This is what happens prior to mitosis in cell division.

During mitosis DNA molecules unwind?

No - the opposite. During mitosis, DNA is very tightly packed, it is during synthesis that the molecules unwind.

How is a DNA molecule ''unzipped''?

DNA is, as you say, "unzipped" is a complex process. DNA usually unwinds either to replicate DNA or synthesize mRNA to make proteins. I'll use DNA replication as the example.

How is a DNA molecule unzipped?

The original strand of DNA is unzipped by an enzyme that breaks thehydrogen bonds between the bases. This process continues until theentire strand of DNA has been unzipped and

During mitosis does DNA molecules unwind?

Quite the contrast, actually. During mitosis, the DNA is in a coiled form of chromosome. During DNA replication, however, the DNA is unwound with the help of an enzyme DNA hel