Which molecule is identified as a precursor to vitamin D?

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Multiple Choice

Which molecule is identified as a precursor to vitamin D?

Explanation:
Vitamin D synthesis in the skin starts from a cholesterol-related molecule. In skin cells, a cholesterol derivative called 7-dehydrocholesterol absorbs UVB light and is converted into vitamin D3. Since 7-dehydrocholesterol comes from cholesterol, cholesterol serves as the starting material for this pathway. The other listed molecules—choline, glucose, and vitamin C—do not participate in the formation of vitamin D. After its initial production, vitamin D is processed in the liver and kidneys to become the active form.

Vitamin D synthesis in the skin starts from a cholesterol-related molecule. In skin cells, a cholesterol derivative called 7-dehydrocholesterol absorbs UVB light and is converted into vitamin D3. Since 7-dehydrocholesterol comes from cholesterol, cholesterol serves as the starting material for this pathway. The other listed molecules—choline, glucose, and vitamin C—do not participate in the formation of vitamin D. After its initial production, vitamin D is processed in the liver and kidneys to become the active form.

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