Question

81) The mutagenic effect of UV light isa. the alteration of cytosine bases to adenine bases.b. the formation of adenine dimers that interfere with genetic expression.c. the breaking of the sugar-phosphate backbone of the DNA molecule.d. the formation of thymine dimers that disrupt DNA replication.e. the deletion of thymine bases along the DNA molecule.

Answer 1

Ultraviolet light can induce the formation of pyrimidine dimers of adjacent nucleotides, which affects the nucleotide bases cytosine and thymine. This can disrupt transcription as well as replication but is usualy corrected by photolyases or nucleotide excison reparir.

This means D, the formation of thymine dimers that disrupt DNA replication, would be the right answer.