Question

G0 is a non-dividing phase of the cell cycle where the cell is not preparing to replicate. Cells may enter G0 during G1 and remain for the rest of their life, or a signal may cause them to re-enter G1 and continue in the cell cycle. Consider two cells: a stomach-lining epithelial cell dividing more than twice a day and a liver cell dividing every year or two. Which cell is likely to be in G0 phase and why?

Answer 1

The liver cell that divides every year or two is likely to be in the G0 phase because it divides infrequently and can remain in this phase for long periods before possibly re-entering the cell cycle.

Step-by-step explanation:

The cell likely to be in the G0 phase is the liver cell that divides every year or two. The stomach-lining epithelial cell, which divides more than twice a day, is regularly engaging in the cell cycle and thus spends very little, if any, time in G0. On the other hand, the liver cell, with its infrequent division, may remain in G0 for extended periods before being triggered to re-enter G1 and proceed with the cell cycle. Liver cells can enter G0 due to various signals or environmental conditions but can also be called back into the cycle by other external signals or the body's needs.