In many eukaryotes, there are repetitive sequences at the ends of chromosomes called telomeres. After successive rounds of DNA replication, the _______ strand becomes shorter. In some cells, an enzyme called _______ repairs the shortened strand.
A) lagging; telomerase
B) leading; DNA polymerase I
C) leading; replicase
D) lagging; DNA polymerase I
E) leading; telomerase

Question

Quizplus · Accepted Answer

The lagging strand becomes shorter after DNA replication because the RNA primers used for Okazaki fragments cannot be replaced with DNA at the very end. Telomerase is the enzyme that extends the telomeres, compensating for this shortening.

In Many Eukaryotes, There Are Repetitive Sequences at the Ends