Knowledge of the cell cycle has led to improved means of treating cancer.The drug 5-fluorouracil, which blocks the synthesis of thymine, inhibits the cell cycle during
A) G1 phase.
B) G2 phase.
C) S phase.
D) prophase.
E) metaphase.

Question

Quizplus · Accepted Answer

5-fluorouracil inhibits the synthesis of thymine, an essential component of DNA replication. This drug therefore affects the S phase of the cell cycle, where DNA synthesis occurs. Blocking DNA synthesis prevents the cell from progressing through the rest of the cell cycle, ultimately leading to cell death.

Knowledge of the Cell Cycle Has Led to Improved Means