Whether During Mitosis or Meiosis, Sister Chromatids Are Held Together

Whether during mitosis or meiosis, sister chromatids are held together by proteins referred to as cohesins. Such molecules must ________.

A) persist throughout the cell cycle
B) be removed before meiosis can begin
C) be removed before sister chromatids can separate
D) reattach to chromosomes during G1
E) be intact for nuclear envelope re-formation