What is the average cell cycle span for a mammalian cell?

Options

A. 36 hrs
B. 24 hrs
C. 48 hrs
D. 12 hrs

Answer

To determine the average cell cycle span for a mammalian cell, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**: The cell cycle consists of a series of phases that a cell goes through to divide and replicate. For mammalian cells, the cell cycle is typically divided into five distinct phases.

2. **Identifying the Phases**: The five phases of the mammalian cell cycle are:
- G0 phase (resting phase)
- G1 phase (first gap phase)
- S phase (synthesis phase, where DNA is replicated)
- G2 phase (second gap phase)
- M phase (mitosis, where the cell divides)

3. **Average Duration of the Cell Cycle**: The average duration of the entire cell cycle for a typical mammalian cell is known to be around 24 hours. This includes all the phases mentioned above.

4. **Selecting the Correct Option**: Given the options:
- A) 36 hours
- B) 24 hours
- C) 48 hours
- D) 12 hours

The correct answer is **B) 24 hours**.

### Final Answer:
The average cell cycle span for a mammalian cell is **24 hours**.

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