Question

why is the human cell. cell cycle dependent

Answer 1

Cell cycle is nothing but chain of events that are responsible for cell division. It includes two main phases which come one after another. These are interphase and mitotic phase (cell division) phase.

So, effectively cell cycle revolves around a gap or preparatory phase and actual division phase. The human cell cycle can be further divided into 4 sub-phases- G1, S, G2, M phase. Cyclins and cyclin dependent kinases regulate that whether a cell will enter in a particular phase of cell cycle or not,

Therefore, having cell cycle has following advantages-

The cell gets time to prepare itself (Like nutrient accumulation, DNA replication.) for cell division during interphase.

Further breakdown of interphase helps in ensuring separation of different processes to be completed at each sub phase. For example during G1 phase cell performs protein synthesis and synthesizes DNA polymerases and histone proteins so that it can perform DNA replication during S phase.

There are cell cycle check points after completion of every sub phase of cell cycle, It ensures that the task supposed to be completed in any subphase is actually completed or not. Like cell cycle check point after S phase confirms that whether successful and foolproof DNA replication is completed or not.

Problematic cell cycle can led to irregular or un controlled cell division like cancer. Hence, having a cell cycle is very important for proper growth and development.