Multiple choice

Thymine dimers may be induced by UV light. When they occur, they are repaired by

  1. excision enzymes

  2. DNA polymerase

  3. ligase

  4. ALL OF THESE ARE NEEDED
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Repairing thymine dimers involves a multi-step process: excision enzymes (like uvrABC endonuclease) remove the damaged segment, DNA polymerase fills the gap, and DNA ligase seals the nick.

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