Final answer:
Telomerase elongates the incomplete newly synthesized lagging strand by adding repetitive nucleotide sequences, allowing for complete replication of chromosome ends.
Step-by-step explanation:
The end of a newly replicated chromosome is addressed by the enzyme telomerase, which is specifically designed to elongate telomeres and solve the problem of incomplete replication at chromosome ends.
Telomerase elongates the template of the lagging strand by adding repetitive nucleotide sequences. This allows for the maintenance of chromosome length despite successive rounds of DNA replication. After telomerase has extended the 3' end of the lagging strand, DNA polymerase is then able to add complementary nucleotides to the very ends of chromosomes.
Hence, the correct answer to the question 'Which strand will telomerase elongate?' is B. the incomplete newly synthesized lagging strand. This is because telomerase expressly elongates the 3' end of the lagging strand to compensate for the inability of DNA polymerase to completely replicate the ends of linear chromosomes.