________, Which is Usually Inactive in Adult Cells, is Active

Question

________, which is usually inactive in adult cells, is active in 90% of cancer cells.
A) Phagocytosis
B) Apoptosis
C) The p53 gene
D) Telomerase
E) DNA polymerase

Accepted Answer

Telomerase, which is responsible for lengthening telomeres, is usually switched off in adult cells but is active in 90% of cancer cells, allowing the cancer cells to maintain their telomeres and continue dividing.