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Skin color is a result of

A.

melanin

B.

hemoglobin

C.

carotene

D.

All can contribute to skin color.

Answer and Explanation

The Correct Answer is D

A. melanin: Melanin is the primary pigment responsible for skin color, produced by melanocytes in the epidermis. It provides protection against ultraviolet (UV) radiation and contributes to variations in skin tones among individuals.

B. hemoglobin: Hemoglobin in red blood cells contributes to the pinkish or reddish hue of the skin, particularly in light-skinned individuals, due to oxygenated blood flowing close to the surface.

C. carotene: Carotene is a yellow-orange pigment found in certain vegetables and can accumulate in the skin, especially in the stratum corneum and fatty tissues, influencing skin color.

D. All can contribute to skin color: Skin color is determined by a combination of melanin, hemoglobin, and carotene. The relative influence of each pigment varies, but together they produce the wide range of human skin tones.


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Related Questions

Correct Answer is B

Explanation

False:On mRNA, three sequential nucleotides are referred to as a codon. Codons are read during translation to direct the incorporation of specific amino acids into a growing polypeptide chain. A triplet refers to three sequential bases on DNA, which together code for one amino acid. This terminology applies specifically to DNA rather than mRNA.

Correct Answer is C

Explanation

A. stratum spinosum:This layer lies just above the stratum basale and is composed of keratinocytes that provide structural strength. While important for resilience, it does not contain multiple layers of dead cells.

B. stratum basale:This is the deepest epidermal layer consisting of a single row of basal cells that actively divide to form new keratinocytes. It contains living cells, not dead ones.

C. stratum corneum:The stratum corneum is the outermost layer of the epidermis, made up of up to 30 layers of flattened, dead keratinized cells. These cells provide a protective barrier against pathogens, water loss, and mechanical stress.

D. stratum granulosum:This layer lies beneath the stratum corneum and consists of keratinocytes beginning to die and fill with keratin. It does not contain as many layers as the stratum corneum and is not the thick, fully dead cell layer.

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