What is typically the first step in the cell cycle?

The first step in the cell cycle is the G1 phase, also known as the first gap phase. During G1, the cell undergoes significant growth and preparation for DNA synthesis. It is characterized by the cell increasing in size and producing RNA, proteins, and organelles necessary for cell function and division. Additionally, the cell assesses its internal environment and external signals to determine if it is ready to proceed to the next phase, S phase, where DNA replication occurs.

The G1 phase is crucial as it sets the stage for the cell's transition to S phase, ensuring that all necessary components are available for successful DNA replication. This phase also contains checkpoints that help regulate the cell cycle and prevent potential errors, highlighting its importance in maintaining cellular integrity and function.