vinblastine is a chemotherapeutic drug often administered to patients suffering from Hodgkin’s lymphoma, lung cancer, and bladder cancer. Vinblastine works by entering cancer cells and binding to tubulin, which is a protein that forms microtubules. Once Vinblastine has bound to tubulin, it inhibits the assembly of microtubules and proper formation of the mitotic spindle. This causes the cell cycle to arrest. a) Identify and explain two phases of the cell cycle most affected by Vinblastine. b) Identify the checkpoint that is most likely responsible for arresting the cell cycle