Lаb 7 Which оf the fоllоwing аccurаtely describes the actions occurring during the S-phase of interphase ? Each chromosome is duplicated; each chromosome results in two sister chromatids attached at a centromere. The chromosome number is halved in preparation for cell division. The cell enlarges, proteins are increased and organelles duplicated. Cell reaches maximum size and adds more proteins. Each chromosome is duplicated; each chromosome results in two sister chromatids attached at a centromere.