Biology 1001A Lecture Notes - Retinol, Root Hair, Cytosol

• School: Western University
• Department: Biology
• Course: Biology 1001A
• Professor: Tom Haffie

Document Summary

This causes a huge bump in the helix. The thymine dimer in chromosomes in fatal, cannot replicate through that damage. These dimers can be repaired by photolyase of excision mechanism of action of dna repair enzymes. Photolyase breaks the thymine bonds and restores the thymines back to normal. Photolyase is driven by photons of light white (visible part of sunlight) because when you are exposed to uv light you are also exposed to white light. Another way to repair them is to chop them out, distortion is so easily found, they make a nick on either side and replace that space with a pair of a"s as it should be (excision) Fixing this damage can result in mutation because these repair mechanisms are so error prone mechanism of action of dna damage by ionizing mutagensis. When they pass through your tissue, ionize, and you end up with reactive oxygen species. Reactive oxygen is what damages the dna.