Question

Approximately how long is the DNA molecule in a single human cell if stretched out?

• A. 2 meters
• B. 2 centimeters
• C. 2 kilometers
• D. 2 micrometers

Hint:

Despite its length, DNA's efficient packaging allows it to fit within the confined space of the cell nucleus, enabling the storage of vast genetic information.

Answer 1

The Correct Option is A

A single human cell contains approximately 2 meters of DNA when fully stretched out. This extensive length is compacted and organized within the cell nucleus through a complex structure involving histones and higher-order chromatin folding. Despite the long length, DNA is efficiently packaged to fit inside the microscopic nucleus of the cell. DNA Packaging: \[ \text{2 m} \rightarrow \text{Wrapped into histones} \rightarrow \text{Forming nucleosomes} \rightarrow\text{Folding chromatin fibers}\rightarrow \text{Chromosomes} \] Conclusion: The DNA in a single human cell, if stretched out, measures approximately 2 meters in length. % Quicktip