A cell has increased in size and is preparing to divide. Before division can occur, the DNA must be replicated. In which stage of the cell cycle is DNA replicated?

Rationale

Synthesis

During the cell cycle, DNA replication occurs in the S phase, also known as the synthesis phase. This stage is crucial for ensuring that each daughter cell receives an identical set of genetic material after cell division.

A (Synthesis) CORRECT

The S phase is specifically designated for DNA replication, where the entire genome is duplicated to prepare for cell division. This ensures that both daughter cells will receive a complete set of chromosomes, maintaining genetic continuity across generations.

B (G1) YOUR ANSWER

The G1 phase is the first gap phase that occurs before DNA synthesis. During this stage, the cell grows and performs its normal functions, but DNA replication does not take place here. The G1 phase focuses on cellular growth and preparation for the upcoming S phase.

C (G2) YOUR ANSWER

The G2 phase follows the S phase and is primarily focused on preparing for mitosis. During this phase, the cell continues to grow and produces proteins necessary for cell division, but no DNA replication occurs. Instead, G2 serves as a checkpoint to ensure that DNA has been accurately replicated during the S phase.

D (Cytokinesis) YOUR ANSWER

Cytokinesis is the process that follows mitosis, where the cytoplasm divides to form two separate daughter cells. This stage does not involve any DNA replication; rather, it is the final step in the cell cycle after the chromosomes have already been duplicated and separated.

Conclusion

The S phase is the critical stage of the cell cycle where DNA replication occurs, ensuring that each daughter cell receives the necessary genetic information. The other phases—G1, G2, and cytokinesis—play distinct roles in the cell cycle, but only the S phase is responsible for synthesizing DNA. Understanding these stages is essential for comprehending how cells reproduce and maintain genetic integrity.

A cell has increased in size and is preparing to divide. Before division can occur, the DNA must be replicated. In which stage of the cell cycle is DNA replicated?

Synthesis

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