With each replication of the DNA molecule, the DNA molecule becomes shorter.
a. This is best explained by the fact that DNA polymerase can only add nucleotides to the 5' end
b. This problem is resolved by telomerase, which extends the 3' end of the DNA
c. This is not a problem because the telomere is a nonessential repeating unit
d. This is true only if the organism has been exposed to excessive amounts of ultraviolet radiation
e. This is due to the fact that thymine dimers cause DNA to buckle and interfere with DNA replication
Answer: B