Question

Thymine dimers form when ________.

A) two thymines are inserted into a DNA sequence
B) two thymines on separate strands of DNA bind to together
C) two thymines adjacent to each other are deleted from the DNA sequence
D) two thymines on the same strand and adjacent to each other bind together
E) two thymines on the same strand but not adjacent to each other bind together

Answer 1

Thymine dimers form when two thymines on the same strand and adjacent to each other bind together. They can be repaired by nucleotide excision.

Step-by-step explanation:

Thymine dimers are formed when two thymines on the same strand and adjacent to each other bind together.

This occurs when the DNA is exposed to UV light.

Thymine dimers can be repaired by a process called nucleotide excision.