Final answer:
The enzyme involved in the direct reversal of DNA damage through photoreactivation is called photolyase, which repairs thymine dimers using energy from visible light.
Step-by-step explanation:
The enzyme responsible for the direct reversal of DNA damage through the use of a photoreactivation system is called photolyase.
This enzyme effectively repairs thymine dimers, which are a form of DNA damage created when UV light causes two adjacent thymine bases to bond together, distorting the DNA helix.
During photoreactivation, photolyase binds to the distorted DNA and utilizes energy from visible light to cleave the abnormal bond between the thymine bases, thereby restoring the DNA's normal structure.