Which of the following happens during interphase?
a.prophase
b.cell growth
c.cytokinesis
d.cell division
The Correct Answer and Explanation is :
The correct answer is b. cell growth.
Explanation:
Interphase is the longest phase of the cell cycle and occurs before a cell enters mitosis or meiosis. It consists of three main stages: G1 (Gap 1), S (Synthesis), and G2 (Gap 2).
- G1 Phase (Cell Growth): During this initial phase, the cell grows in size, produces RNA, and synthesizes proteins necessary for DNA replication. This phase is crucial for the cell to prepare for DNA synthesis. The cell also undergoes metabolic processes to support its increased size and prepare for the next stages of division. Additionally, the cell monitors its environment to ensure conditions are favorable for division. If the conditions are not suitable, the cell can enter a resting state known as G0, where it exits the cycle temporarily.
- S Phase (DNA Synthesis): In this phase, the cell replicates its DNA, resulting in two complete sets of chromosomes. This ensures that when the cell divides, each daughter cell will receive an identical set of genetic material.
- G2 Phase (Preparation for Mitosis): Following DNA synthesis, the cell enters the G2 phase, where it continues to grow and produces proteins and organelles that are necessary for cell division. It also conducts final checks to ensure that DNA has been accurately replicated without damage.
In contrast to interphase, the other options listed occur in later stages of the cell cycle. Prophase (option a) is the first stage of mitosis, where chromosomes condense, and the nuclear envelope breaks down. Cytokinesis (option c) is the process of dividing the cytoplasm, which occurs after mitosis. Cell division (option d) is the overall term that encompasses mitosis and cytokinesis, happening after interphase is complete. Thus, cell growth during interphase is vital for preparing the cell for division and ensuring the successful propagation of cellular information.