【单选题】A drug that inhibits DNA replication, but is inactivated by chromosomes containing telomeres, would prove to be a very useful antibiotic. Telomeres can be best described by which one of the following?
A.
Telomeres are only present in circular chromosomes.
B.
Before telomerase action, and after DNA replication, there is a 3 ′ overhang of the newly synthesized strand.
C.
Before telomerase action, and after DNA replication, there is a 5 ′ overhang of the strand being replicated.
D.
In human DNA, telomeres consist of repeating sequences of TTAGGT.