Spontaneous Mutation Occurs When

Multiple Choice

Spontaneous mutation occurs when

A) a DNA base is in a rare tautomeric form as the replication fork arrives, and a mismatched base is inserted.
B) a person smokes cigarettes or is exposed to a teratogen for many years.
C) the sugars and phosphates in the DNA double helix exchange places.
D) thymine temporarily becomes uracil.
E) a replication fork stalls.