Multiple choice

If a person's total DNA were laid in a straight line, how far would it stretch?

  1. 10 km

  2. length of a football field

  3. 1.5 times the diameter of the solar system

  4. the entire length of the Milky Way Galaxy

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If all the DNA in a single human cell were uncoiled and stretched out, it would be about 2 meters long. Since there are trillions of cells in the body, the total length is astronomical, extending far beyond the solar system.