| 1. | Researchers list these factors that determine the provitamin A activity of carotenoids:
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| 2. | Provitamin D 2 is ergosterol, and provitamin D 3 is 7-dehydrocholesterol.
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| 3. | Provitamin D 2 is ergosterol, and provitamin D 3 is 7-dehydrocholesterol.
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| 4. | Menadione is a synthetic provitamin of vitamin K.
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| 5. | Kiwifruit pulp contains carotenoids, such as provitamin A beta-carotene, lutein and zeaxanthin.
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| 6. | It is commonly found as its alcohol analog, the provitamin panthenol ( pantothenol ), and as calcium pantothenate.
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| 7. | Newer research has shown that the absorption of provitamin-A carotenoids is only half as much as previously thought.
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| 8. | His laboratory was the first to produce a GM tomato with elevated levels of ? carotene ( provitamin A ).
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| 9. | Golden Rice 2 contains sufficient provitamin A to provide the entire dietary requirement via daily consumption of some 75g per day.
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| 10. | Some phytochemicals have been considered as possible drugs for millennia, while others, like carotenoids, are significant as provitamin compounds.
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