Review Question - QID 108854

A 42-year-old male presents to his primary care physician complaining of fatigue. He has not been to the doctor since he was 22 years of age. He reports that over the past three months, he has felt tired and weak despite no changes in diet or exercise. He is otherwise healthy and takes no medications. Family history is notable for colorectal cancer in his father and paternal uncle, ovarian cancer in his paternal grandmother, and pancreatic cancer in his paternal uncle. Physical examination is notable for conjunctival pallor. A complete blood count reveals a hemoglobin of 9.1 g/dL and hematocrit of 31%. A stool sample is hemoccult positive and a colonoscopy reveals a fungating hemorrhagic mass in the ascending colon. Which of the following processes is most likely impaired in this patient?