Which of the following could likely play a role in causing cancer? 1.Cells adhere too strongly to ...

Which of the following could likely play a role in causing cancer?
  1.Cells adhere too strongly to one another, causing a tumor to form.
  2.Kinase enzymes add phosphates onto proteins that regulate the cell cycle.
  3.The cell cycle skips interphase.
  4.Checkpoint proteins make cells commit suicide.

Question 2

Which of the following is not true of sister chromatids?
  1.they separate at anaphase
  2.they are attached to one another at the centrosome
  3.at the end of interphase, there are two sister chromatids for every chromosome
  4.they have the same DNA sequence as each other