Lesson: Chapter 1 — The Chemical Basis of Life
This erases every answer in this set and starts you again at question one. Your score will be gone.
Type these four numbers to confirm:
Those numbers don't match. Look at them again and type them.
By composition, roughly how much of a mature human body is protein material?
The right answer is the one marked above.
About 17%. After water, protein is the most abundant substance in the body.
7% is the share taken by mineral salts, and 65% is oxygen's share of the body by element — a different measurement altogether.
This browser is not saving your answers, so no total can be shown.
Answer the question to continue.