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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. Types of muscle tissue: skeletal, cardiac, adipose: This group is incorrect because adipose (fat) is not a type of muscle tissue. The three correct types of muscle tissue are skeletal, cardiac, and smooth.

B. Types of tissue: epithelial, connective, nerve, muscle: The four main types of tissues in the human body are epithelial, connective, nervous, and muscle tissue.

C. Types of nervous cells: neurons, neuroglia. The nervous system consists of neurons (which transmit electrical signals) and neuroglia (which support and protect neurons).

D. Serous membranes: pleura, peritoneum, pericardium. The pleura (lungs), peritoneum (abdominal organs), and pericardium (heart) are all serous membranes.

Correct Answer is B

Explanation

A. Hypernatremia: Hypernatremia refers to high sodium levels, which are not directly related to impaired glucose metabolism.

B. Hyperglycemia: Aging reduces insulin sensitivity and pancreatic function, leading to higher blood glucose levels, or hyperglycemia, which is a risk factor for diabetes mellitus.

C. Hypoglycemia: Aging-related insulin resistance typically results in elevated glucose levels (hyperglycemia), not low blood sugar (hypoglycemia).

D. Hyperkalemia: Hyperkalemia is an excess of potassium in the blood, which is not directly linked to impaired glucose metabolism.

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