When dna is copied, sometimes a new, incorrect, base pairing appears within the structure of a new dna molecule replacing original base pairs. this mistake is called a base-pair
a. deletion
b. institution
c. substitution

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different