The longest phase during the eukaryotic cell cycle is
यूकेरियोटिक कोशिका चक्र (eukaryotic cell cycle) के दौरान सबसे लंबी अवस्था (longest phase) कौन सी होती है?
Eukaryotic Cell Cycle Phases:
- The cell cycle comprises Interphase ($G_1$, S, $G_2$) and the M phase (Mitosis/Meiosis).
- $G_1$ Phase (Gap 1): This is the first growth phase post-mitosis. Cells actively synthesize proteins, enzymes, RNA, and duplicate organelles to prepare for DNA replication. In a typical 24-hour human cell cycle, $G_1$ occupies approximately 10–12 hours, making it the single longest phase of the cell cycle.
- S Phase: Synthesis phase where DNA replication occurs (~6–8 hours).
- $G_2$ Phase: Pre-mitotic preparation (~3–4 hours).
- M Phase: Mitosis and cytokinesis (~1 hour).
Therefore, the longest phase during the eukaryotic cell cycle is the $G_1$ phase.
Correct Answer: Option 1 ($G_1$).
विस्तृत व्याख्या:
Eukaryotic Cell Cycle Phases (यूकेरियोटिक कोशिका चक्र की प्रावस्थाएं):
- The cell cycle comprises Interphase ($G_1$, S, $G_2$) and the M phase (Mitosis/Meiosis).
- $G_1$ Phase (Gap 1): This is the first growth phase post-mitosis. Cells actively synthesize proteins, enzymes, RNA, and duplicate organelles to prepare for DNA replication. In a typical 24-hour human cell cycle, $G_1$ occupies approximately 10–12 hours, making it the single longest phase of the cell cycle.
- S Phase: Synthesis phase where DNA replication occurs (~6–8 hours).
- $G_2$ Phase: Pre-mitotic preparation (~3–4 hours).
- M Phase: Mitosis and cytokinesis (~1 hour).
Therefore, the longest phase during the eukaryotic cell cycle is the $G_1$ phase.
Correct Answer: Option 1 ($G_1$).
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