Human skin pigmentation response: Why does skin become darker after excess sun exposure? Identify the specific pigment that increases following UV exposure. Choose the correct pigment.

Difficulty: Easy

Melanin
Carotene
Hemoglobin
Bilirubin

Correct Answer: Melanin

Explanation:

Concept / Approach
UV exposure stimulates melanocytes to produce more melanin, which darkens the skin and helps protect underlying tissues from UV damage.

Why others are incorrect
Carotene is a dietary pigment; hemoglobin colors blood; bilirubin is associated with jaundice.

Final Answer
Melanin.

← Previous Question Next Question→

More Questions from Biology

Discovery of the nucleus (1831): Who first described the rounded, genetic-material–containing body in plant cells? Name the scientist who discovered the nucleus in 1831. Choose the correct name.
Effect of rainwater on soil: Rain water helps to increase the ______ to some extent. Consider natural nitrogen fixation in the atmosphere and deposition to soils. Fill the blank with the most appropriate soil property.
Nature of photosynthesis: Which description best characterizes photosynthesis? Consider energy flow and metabolic type; mention redox as context. Choose the correct statement.
Definition of radioactivity: Radioactivity is the spontaneous emission of which radiations from unstable nuclei? State the complete set commonly observed. Choose the correct option.
Blood clotting factors: Prothrombin, essential for coagulation, is released/produced by which organ? Consider the site of plasma protein synthesis and vitamin K–dependent factors. Choose the correct organ.
Comparative anatomy — snake venom glands: The poison glands of snakes are homologous to which glands in other vertebrates? Identify the correct homologous structure. Choose the correct option.
Plant ecology terminology: Identify the term for plants that grow under average (moderate) temperature and moisture conditions. Full question: Plants that thrive in neither arid nor aquatic habitats—i.e., typical, moderate environments—are called what? Choose the correct option.
Plant morphology: Determine which organ the edible potato (Solanum tuberosum) is a modified outgrowth of. Full question: Potato is a modified form (outgrowth) of which plant organ? Identify the precise botanical classification. Choose the correct option.
Human physiology (transport of gases): Name the protein that carries oxygen in the blood. Full question: Oxygen in our blood is primarily transported bound to which protein molecule? Choose the correct option.
Medical microbiology: Match the pathogen to the disease—Vibrio ‘‘comma’’ bacillus causes which illness? Context: Mycobacterium leprae → leprosy; Corynebacterium diphtheriae → diphtheria. Choose the correct disease caused by Vibrio comma (Vibrio cholerae).

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion