Sat January 28, 2012 By: Ashok Sharma

How do organisms build copies of their own DNA?How does it help?

Expert Reply
Mon January 30, 2012

This is done through DNA replication. DNA replication is a biological process that occurs in all living organisms and copies their DNA; it is the basis for biological inheritance.

The process starts with one double-stranded DNA molecule and produces two identical copies of the molecule. Each strand of the original double-stranded DNA molecule serves as template for the production of the complementary strand, a process referred to as semiconservative replication.

In a cell, DNA replication begins at specific locations in the genome, called origins Unwinding of DNA at the origin, and synthesis of new strands, forms a replication fork. In addition to DNA polymerase (the enzyme that synthesizes the new DNA by adding nucleotides matched to the template strand) a number of other proteins are associated with the fork and assist in the initiation and continuation of DNA synthesis.

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