Choose the Correct Answer from the List Below

Choose the correct answer from the list below. Not all of the answers will be used.
-_______________ is/are often found to cause alternative structures in DNA replication.

A) uracil
B) DNA ligase
C) Huntington disease
D) Ames
E) xeroderma pigmentosum
F) tumor-suppressor genes
G) trinucleotide repeats
H) skin carcinoma
I) mutagen
J) direct repair
K) indirect repair
L) photolyase