Your body’s biological “auto‑correct” systems detect and correct well over 99.9999% of molecular-level errors (like DNA copying mistakes), which is often summarized in textbooks as “almost 100%” accuracy.

What the question is really asking

When this question appears in biology or health homework, it almost always refers to DNA replication and the associated proofreading and repair systems in cells. These systems catch nearly every copying mistake, leaving only about 1 error per 10 billion base pairs replicated, which corresponds to greater than 99.999999% accuracy in error detection and correction. So for quiz or worksheet purposes, the expected answer is typically:

  • “Almost 100%”
  • Or “about 99.99999999%” (often rounded or described as “virtually all errors”).

Why it’s “almost 100%”

  • DNA polymerase has a proofreading function that checks each newly added base and removes most mismatches.
  • Additional repair systems scan and fix many of the rare errors that escape initial proofreading.
  • Only a tiny fraction of errors make it through all these safeguards, which is why mutations are relatively rare per cell division, even though your cells replicate DNA constantly throughout life.

Quick takeaway

If you are filling in a blank or choosing from options, the safest, teacher- expected answer is:

Your body’s “auto-correct” system detects almost 100% of errors (often expressed as ~99.99999999%).

Information gathered from public forums or data available on the internet and portrayed here.