With strong enough UV light, Vitamin D is made from ......................in the skin

Question

BlackTom AI · Accepted Answer

When considering how Vitamin D is synthesized in the skin under UV exposure, a key biochemical precursor is a cholesterol-related molecule. 
Option: proteins — Proteins are polymers of amino acids and do not serve as the chemical precursor for UV-driven vitamin D synthesis in the skin, so this is not correct. 
Option: phospholipids — Phospholipids are membrane components, not the vitamin D precursor formed during UV exposure, making this choice inaccurate. 
Option: cholesterol — Indeed, 7-dehydrocholesterol, a cholesterol precursor located in the skin, absorbs UV light and is converted to previtamin D3, which eventually becomes vitamin D3. This aligns with the established cutaneous synthesis pathway. 
Option: Very Low Density Lipoprotein (VLDL) — VLDL is a blood lipid transport particle, not a substrate involved in the UV-induced synthesis of vitamin D in the skin, so this is misleading. 
In summary, the only option that correctly identifies the substrate involved in UV-driven vitamin D production in the skin is cholesterol (more precisely, a cholesterol precursor in the skin).

11:709:255:01 NUTRITION AND HEALTH Lecture Quiz 11 - Fat Soluble Vitamins

With strong enough UV light, Vitamin D is made from ......................in the skin

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