Which of the following chemicals does NOT contribute to the color of human skin?
A)carotene
B)hemoglobin
C)pheomelanin
D)eumelanin
E)melatonin

Question

Quizplus · Accepted Answer

Melatonin is a hormone secreted by the pineal gland that regulates sleep and wakefulness and does not contribute to the color of human skin. The other choices (carotene, hemoglobin, pheomelanin, and eumelanin) are pigments that contribute to the color of human skin.

Which of the Following Chemicals Does NOT Contribute to the Color