CBSE Class 12-science Answered
DNA replication
Asked by rasil.guleria | 09 Jun, 2019, 12:25: PM
Expert Answer
DNA replication is the process by which DNA makes a copy of itself during cell division.
- The first step in DNA replication is to ‘unzip’ the double helix structure of the DNA molecule.
- This is carried out by an enzyme helicase which breaks the hydrogen bonds holding the complementary bases of DNA together (A with T, C with G).
- The separation of the two single strands of DNA creates a ‘Y’ shape called a replication ‘fork’. The two separated strands will act as templates for making the new strands of DNA.
- One of the strands is oriented in the 3’ to 5’ direction (towards the replication fork), this is the leading strand. The other strand is oriented in the 5’ to 3’ direction (away from the replication fork), this is the lagging strand.
Answered by Sivanand Patnaik | 09 Jun, 2019, 03:21: PM
Concept Videos
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Process of Replication of DNA
This video explains about process of DNA replication -
Semiconservative Method of Replication
This video explains about semiconservative method of replication
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