What bonds do helicase break?
The process of breaking the hydrogen bonds between the nucleotide base pairs in double-stranded DNA requires energy. To break the bonds, helicases use the energy stored in a molecule called ATP, which serves as the energy currency of cells.
What bonds are broken by DNA helicase in order to unzip the DNA?
Explanation: Helicases are enzymes involved in unzipping of the double stranded DNA molecule at beginning of DNA replication. They do so by binding at DNA sequences called origins on DNA molecule then they break the hydrogen bonds between complementary base pairs causing the two strands of DNA molecule to unzip.
What happens after DNA unzips?
DNA replication occurs through the help of several enzymes. These enzymes “unzip” DNA molecules by breaking the hydrogen bonds that hold the two strands together. Each strand then serves as a template for a new complementary strand to be created. Complementary bases attach to one another (A-T and C-G).
What causes DNA to replicate?
DNA replication is one of the most basic processes that occurs within a cell. Each time a cell divides, the two resulting daughter cells must contain exactly the same genetic information, or DNA, as the parent cell. To accomplish this, each strand of existing DNA acts as a template for replication.
Is the copy of DNA exactly similar?
When replication is complete, each new DNA contains one old and one new strand or one parental and one daughter strand. Once the strands are separated, an enzyme called DNA polymerase copies each strand using the base-pairing rule. The two strands are not exactly copied the same way.
What does 3 prime and 5 Prime mean in a DNA molecule?
The 5′ and 3′ mean “five prime” and “three prime”, which indicate the carbon numbers in the DNA’s sugar backbone. For example, DNA polymerase works in a 5′ -> 3′ direction, that is, it adds nucleotides to the 3′ end of the molecule (the -OH group is not shown in diagram), thus advancing to that direction (downwards).
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