Chemotherapy, or the use of chemical agents to destroy cancer cells, is a mainstay in the treatment of malignant tumors. Most chemotherapy agents kill cancer cells by affecting the S-phase of the cell cycle. Which of the following best explains why the S-phase is targeted by the chemotherapy agents? a. Because the cell grows and is most active during the S-phase.
c. Because the cell duplicates its DNA for its daughter cells during the S-phase.
b. Because the cell divides and creates new cells during the S-phase.
d. Because the S-phase lasts the longest amount of time of all the cell cycle phases.