Multiple choice If a person's total DNA were laid in a straight line, how far would it stretch? 10 km length of a football field 1.5 times the diameter of the solar system 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.