Multiple choice

Which of the following compounds can be naturally formed by human skin when exposed to sunlight?

  1. Formoterol

  2. Fructose

  3. Fumaric acid

  4. Furan

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

Fumaric acid is found in fumitory bolete mushrooms , lichen and Iceland moss. It is an intermediate in the citric acid cycle used by cells to produce energy in the form of adenosine triphosphate (ATP) from food. Human skin naturally produces fumaric acid when exposed to sunlight.