carrier of genetic information

DNA is the carrier of genetic information, the parent must take their own DNA molecule as a template accurate reproduction into two copies, and assigned to the two daughter cells, go to complete its mission of the carrier of genetic information. And the double-stranded DNA structure of this type of genetic material for the maintenance of the stability and the accuracy of reproduction are extremely important. (A) DNA copy of the semi-reservation Click Waston and raised in the DNA double helix structure on the model of DNA replication during the process of the study, they speculate, DNA base pairs in the process of copying the hydrogen bonds between the first fracture, double helix of the Rotary separately, were linked to each template Synthesis of the new chain, each offspring of a DNA chain from the pro-generation, and the other is a new synthesis, so as to retain a half-copy (semiconservative replication). (B) DNA replication 1. DNA double helix of the rotation (1) single chain DNA-binding protein (single-stranded DNA binding protein, ssbDNA protein) (2) DNA helicase (DNA helicase) (3) DNA of the chain 2. Okazaki fragments and a half does not copy a row 3. Copy the trigger and termination (C) telomeres and telomerase 1941-American Indians McClintock (Mc Clintock) raised a telomere (telomere) of the hypothesis that the chromosome ends must exist a special structure - the telomere. Telomere now known at least two roles: ① chromosome end protection from damage to chromosomes remained stable; ② and nuclear fiber-connected so that the chromosome can be targeted.