Which one of the following statements is incorrect for the interphase stage?

Options

A. Period of great metabolic activity
B. Also called as preparatory phase
C. Absence of replication of DNA
D. It covers over 95% of the total duration of cell cycle

Answer

To determine which statement is incorrect regarding the interphase stage, let's analyze each option based on our understanding of the interphase in the cell cycle.

**Step 1: Understand the Interphase Stage**
Interphase is the phase of the cell cycle where the cell prepares for division. It consists of three sub-phases: G1 (Gap 1), S (Synthesis), and G2 (Gap 2). This stage is crucial for cell growth and DNA replication.

**Step 2: Evaluate Each Statement**
1. **Period of great metabolic activity also called as preparatory phase**: This statement is correct. Interphase is indeed a time of significant metabolic activity as the cell prepares for mitosis.

2. **Absence of replication of DNA**: This statement is incorrect. DNA replication occurs during the S phase of interphase, where the amount of DNA in the cell doubles in preparation for cell division.

3. **It covers over 95 percent of the total duration of the cell cycle**: This statement is correct. Interphase typically occupies the majority of the cell cycle duration, often more than 90%.

**Step 3: Identify the Incorrect Statement**
From the evaluation:
- The statement about the absence of replication of DNA is incorrect because DNA replication does occur during the S phase of interphase.

**Final Answer:**
The incorrect statement regarding the interphase stage is: **"Absence of replication of DNA."**

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