Question

The Cell Cycle is regulated by both external and internal factors.

Answer 1

Answer:

External Factors:

The external factors which influence the cell cycle might be physical or chemical.

Physical factors: Physical signals involve the factors like when a cell touches another cell, it stops dividing.

Chemical factors: Chemical factors are the growth factors or growth proteins that trigger the cells to undergo the process of cell division.

Internal factors:

Kinases: Kinases are the proteins which determine whether the cell will undergo cell division or abort it.

Cyclins: When the signal is right for cell division, cyclins activate the kinases.