Question

Mammals make two forms of the pigment melanin: which appears black or brown, and which appears yellow or red?

1) Eumelanin and Pheomelanin
2) Melanin and Carotene
3) Tyrosine and Dopamine
4) Keratin and Collagen

Answer 1

Eumelanin appears black or brown, while pheomelanin appears red. Melanin is produced more by dark-skinned individuals. Exposure to UV rays stimulates melanin production in the skin. Hence, 1) is correct.

Step-by-step explanation:

Melanin occurs in two primary forms. Eumelanin exists as black and brown, whereas pheomelanin provides a red color. Dark-skinned individuals produce more melanin than those with pale skin.

Exposure to the UV rays of the sun or a tanning salon causes melanin to be manufactured and built up in keratinocytes. The accumulation of melanin in keratinocytes results in the darkening of the skin, or a tan.