Foodservice Dietetic Internship Practice Exam

Which of the following are flavonoids?

Carotenoids and Chlorophyll Betalains and Carotenoids Esters and Sulfhydryl Flavonol and Anthocyanin

Correct Answer:

Flavonol and Anthocyanin

Explanation:

Flavonoids are plant polyphenols known for colorful pigments and antioxidant activity, built on a common C6-C3-C6 skeleton. Subtypes include flavonols (for example, flavonols like quercetin) and anthocyanins (the pigments that give red to blue colors in many fruits and flowers). So a pair that includes a flavonol and an anthocyanin is a direct example of flavonoids. Carotenoids and chlorophyll belong to different pigment families—carotenoids are lipid-soluble pigments with long hydrocarbon chains, while chlorophyll is a magnesium-containing porphyrin pigment. Betalains form yet another distinct pigment class, not flavonoids. Esters and sulfhydryl groups are functional groups, not pigment classes.

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