Photoreactivation - Covalent bonds 5' Ġ Ċ Ġ Å ET Ġ ÀČ Ġ саст AA стас 3' 3' Thymine dimer distorts the DNA molecule. iil 5' 5' Ġ Ċ GÅŤİ Ġ ÅČ Ġ CG CTAACTGC 3' An enzyme uses visible light to break the covalent bond of the thymine dimer, restoring the DNA to its original state. 3' Excision repair - Covalent bonds 5' Ġ C G Å TEŤ ĠÅ C Ġ сасT AA стас 3' LLI TI 3' Thymine dimer distorts the DNA molecule. i l5' Cut Cut An enzyme removes the damaged section by cutting the DNA backbone on either side of the 5' 3' CG CTAA CTGC 3' 1 5' thymine dimer. 5' GC GATT GAC G CGCTAA CTGC !TT 3' The combined actions of DNA polymerase and DNA ligase fill in and seal the gap. FIGURE 8.12 Repair of Thymine Dimers In photoreactivation, an enzyme uses the energy of light to break the covalent bonds. In excision repair, the section containing the dimer is replaced. >

Photoreactivation - Covalent bonds 5' Ġ Ċ Ġ Å ET Ġ ÀČ Ġ саст AA стас 3' 3' Thymine dimer distorts the DNA molecule. iil 5' 5' Ġ Ċ GÅŤİ Ġ ÅČ Ġ CG CTAACTGC 3' An enzyme uses visible light to break the covalent bond of the thymine dimer, restoring the DNA to its original state. 3' Excision repair - Covalent bonds 5' Ġ C G Å TEŤ ĠÅ C Ġ сасT AA стас 3' LLI TI 3' Thymine dimer distorts the DNA molecule. i l5' Cut Cut An enzyme removes the damaged section by cutting the DNA backbone on either side of the 5' 3' CG CTAA CTGC 3' 1 5' thymine dimer. 5' GC GATT GAC G CGCTAA CTGC !TT 3' The combined actions of DNA polymerase and DNA ligase fill in and seal the gap. FIGURE 8.12 Repair of Thymine Dimers In photoreactivation, an enzyme uses the energy of light to break the covalent bonds. In excision repair, the section containing the dimer is replaced. >

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter28: Dna Metabolism: Replication, Recombination, And Repair

Section: Chapter Questions

Problem 1P: Semiconservative or Conservative DNA Replication If 15N-Iabeled E. coli DNA has a density of 1.724...

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please focus on this question 3 times i submitted it and three different answers, please make sure of ur answer