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Which of the following is associated with moles, freckles, and vitiligo?

A.

Bilirubin

B.

Carotene

C.

Keratin

D.

Melanin

Answer and Explanation

The Correct Answer is D

A. Bilirubin: Bilirubin is a yellow pigment derived from the breakdown of red blood cells, associated with jaundice rather than freckles or moles.

B. Carotene: Carotene is an orange pigment found in foods like carrots and can contribute to skin tone but is not the main factor in moles or vitiligo.

C. Keratin: Keratin is a structural protein found in skin, hair, and nails but does not influence pigmentation.

D. Melanin: Melanin is the pigment responsible for skin color, moles, freckles, and conditions like vitiligo, which causes depigmentation.


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Related Questions

Correct Answer is A

Explanation

A. Nervous tissue: Nervous tissue consists of neurons, which have dendrites (receive signals) and axons (transmit signals) to facilitate communication within the nervous system.

B. Muscle tissue: Muscle tissue contracts to cause movement but does not contain dendrites and axons.

C. Epithelial tissue: Epithelial tissue forms protective barriers and does not have neurons or nerve cell structures.

D. Connective tissue: Connective tissue supports and binds body structures but does not transmit nerve signals.

Correct Answer is D

Explanation

A. Scars from a severe burn: Although burn scars may increase skin sensitivity and vulnerability, they are not a primary cause of skin cancer.

B. Exposure to environmental pollutants: Some pollutants may contribute to skin damage, but UV radiation is the primary cause of skin cancer.

C. History of viral illness: Some viruses, such as HPV, are linked to specific cancers (e.g., cervical cancer), but they are not a primary cause of skin cancer.

D. Sun exposure: UV radiation from the sun is the most significant risk factor for skin cancer, particularly basal cell carcinoma, squamous cell carcinoma, and melanoma.

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