Where and when do cyclins act on the cell cycle? (A) Cycling cells undergo three major transitions during their cell cycle. The beginning of S phase is marked by the onset of DNA replication, the ...

In the process of replicating themselves, cells have another choice: do they want to make an identical copy and be left with two cells? Or do they want to make four “half-copies”, in preparation for ...

In textbooks, the grand-finale of cell division is the tug-of-war fought inside dividing cells as duplicated pairs of chromosomes get dragged in opposite directions into daughter cells. This process, ...

Cell division occurs through a series of checks and balances known as the cell cycle. This cycle has four main stages, called gap 1 (G 1), synthesis (S), gap 2 (G 2), and mitotic (M) phases. The ...