Micronutrients and Deficiencies Flashcards
6 cards from real Clinical Nutritionist CCN practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Micronutrients and Deficiencies flashcards as text
Which B vitamin acts as a coenzyme in over 100 enzymatic reactions, particularly amino acid metabolism?
Answer: Pyridoxine (vitamin B6)
Vitamin B6 as pyridoxal phosphate (PLP) is a cofactor for aminotransferases, decarboxylases, and other enzymes central to amino acid metabolism.
Zinc deficiency is characteristically associated with which clinical finding?
Answer: Impaired taste and smell (hypogeusia/anosmia)
Zinc deficiency causes hypogeusia (reduced taste acuity), anosmia, poor wound healing, growth retardation, and immune dysfunction.
What is the Tolerable Upper Intake Level (UL) for preformed vitamin A (retinol) in adults?
Answer: 3,000 mcg RAE/day
The UL for preformed vitamin A is 3,000 mcg RAE/day for adults; excess intake causes hypervitaminosis A with symptoms including liver toxicity and teratogenicity.
Selenium functions primarily as a component of which enzyme system that protects against oxidative stress?
Answer: Glutathione peroxidase
Selenium is an essential component of glutathione peroxidases (GPx), selenoenzymes that reduce hydrogen peroxide and lipid hydroperoxides to protect cells from oxidative damage.
Which fat-soluble vitamin acts as an antioxidant by protecting polyunsaturated fatty acids in cell membranes from oxidation?
Answer: Vitamin E (alpha-tocopherol)
Alpha-tocopherol, the most biologically active form of vitamin E, donates a hydrogen atom to lipid peroxyl radicals, interrupting the chain reaction of lipid peroxidation.
A clinical nutritionist sees a patient with glossitis, angular stomatitis, and a 'magenta tongue.' Which deficiency is suspected?
Answer: Riboflavin (vitamin B2)
Riboflavin deficiency (ariboflavinosis) presents with oral-ocular-genital syndrome including angular stomatitis, cheilosis, glossitis, and corneal vascularization.
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