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Which of the following substances is the determinant of an individual's skin color?

A.

Elastin

B.

Hemoglobin

C.

Melanin

D.

Keratin

Answer and Explanation

The Correct Answer is C

A. Elastin is a protein found in connective tissue that provides elasticity, allowing the skin and other tissues to return to their original shape after stretching. It does not influence skin color. 

B. Hemoglobin is the oxygen-carrying component of red blood cells. It gives the skin a reddish tint due to blood flow, but it is not the primary determinant of overall skin color. 

C. Melanin is the pigment produced by melanocytes in the skin. The type and amount of melanin determine the color of an individual's skin, with darker skin having more melanin. 

D. Keratin is a structural protein found in the skin, hair, and nails, providing strength and protection. While it contributes to the skin's texture and appearance, it does not determine skin color. 


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Related Questions

Correct Answer is A

Explanation

A. Intrinsic factor is a glycoprotein produced by the stomach that binds to vitamin B12 and facilitates its absorption in the small intestine, particularly in the ileum. This is the correct answer.

B. Bile salts are involved in the digestion and absorption of fats, not vitamin B12.

C. Pepsin is an enzyme in the stomach that aids in the digestion of proteins but is not involved in vitamin B12 absorption.

D. Amylase is an enzyme that helps break down carbohydrates, not involved in the absorption of vitamin B12.

Correct Answer is C

Explanation

A. The jejunum is the middle part of the small intestine and is primarily involved in nutrient absorption, but it does not receive bile from the common bile duct.

B. The ileum is the final part of the small intestine, responsible for absorbing bile salts and vitamin B12, but it does not directly receive bile from the common bile duct.

C. The common bile duct empties bile into the duodenum, which is the first part of the small intestine. This allows bile to aid in the digestion and emulsification of fats.

D. The stomach is involved in the digestion of food but does not receive bile directly. Bile enters the small intestine, not the stomach

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