HESI A2 Biology Practice Test

The cell cycle serves a vital purpose in regulating cell growth and division, which is essential for the development, repair, and maintenance of multicellular organisms. Through a series of well-orchestrated phases—G1, S, G2, and mitosis—cells undergo a systematic process of growth, DNA replication, and division into two daughter cells. This ensures that each new cell receives an accurate and complete set of genetic material. During the G1 phase, the cell grows and prepares itself for DNA synthesis; in the S phase, the DNA is replicated; the G2 phase allows the cell to prepare for mitosis by further growing and ensuring all components are ready for division. Mitosis then results in the physical separation of the duplicated chromosomes and the formation of two new cells. This cycle is tightly regulated to prevent issues such as uncontrolled cell growth, which can lead to cancerous developments. While other options involve essential biological processes—such as storing genetic information, synthesizing proteins, and producing ATP for energy—these do not encapsulate the primary function of the cell cycle, which is specifically oriented towards the progression of cell growth and division.