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In a typical mammalian cell the length o...

In a typical mammalian cell the length of DNA is

A

`6.6 times 10^(9)bp times 0.34 times 10^(-9)m`

B

approximately 2.2 metres

C

1.36 mm

D

both 1 and 2

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The correct Answer is:
To determine the length of DNA in a typical mammalian cell, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding DNA Structure**: - In mammalian cells, DNA is tightly coiled and condensed. This is crucial for fitting the DNA into the nucleus of the cell. 2. **Unwinding the DNA**: - If we were to unwind the condensed DNA and stretch it out, it would measure approximately 2 meters to 2.2 meters in length. 3. **Counting Chromosomes**: - Mammalian cells typically contain 23 pairs of chromosomes. Each chromosome has a DNA molecule. 4. **Total Length Calculation**: - If we consider all 23 pairs of chromosomes, the total length of DNA in a human cell would be more than 22 meters when fully unwound, but in a single cell, the length of DNA is approximately 2.2 meters. 5. **Conclusion**: - Therefore, the length of DNA in a typical mammalian cell is approximately 2.2 meters. ### Final Answer: The length of DNA in a typical mammalian cell is approximately **2.2 meters**. ---
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