What is a functional barrier of a cell What is a functional

Solution

Functinal barrier of is the barrier in which a cell need to overcome to have its full functionality.For eg:

Cells in organism and cells in culture both have limited division potential.As number of divisions proceed, cells age in the same way as we age. When they cannot divide any further then they enter a stage called: senescence. Senescent cells do not divide further.There are multiple biochemical factors that lead to senescence. These include depletion of proteins that participate in cell-division. If a depleted protein is supplied from outside (through growing medium in cell culture and through therapy in patients) then cell would divide again. This is overcoming a functional barrier to cell division.