A Level Biology Practice Exam

Which phase of the cell cycle is described as the growth period between cell divisions?

1. Mitotic phase

2. Interphase

3. Prophase

4. Telophase

The correct answer is: Interphase

The growth period between cell divisions is accurately described as interphase. This phase is critical for the cell's preparation for division, as it encompasses the majority of the cell cycle. During interphase, the cell undergoes significant growth, increases its metabolic activities, and duplicates its DNA to ensure that each daughter cell receives the necessary genetic information after division. Interphase can be further subdivided into three stages: G1 (Gap 1), S (Synthesis), and G2 (Gap 2). In G1, the cell grows and synthesizes proteins necessary for DNA replication. During the S phase, the DNA is replicated, and in G2, the cell continues to grow and prepares for mitosis. This phase is essential for ensuring that the cell is fully prepared to divide efficiently. In contrast, the mitotic phase is where actual cell division occurs, while prophase and telophase are specific stages within mitosis, focusing on nuclear changes and chromosome separation rather than overall cell growth and preparation. Thus, interphase is the correct answer, highlighting the importance of this growth period in the cell cycle.