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FNDH 620 Exam 3 – 2022 (COMPLETE SOLUTIONS)

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FNDH 620 Exam 3 – 2022 (COMPLETE SOLUTIONS) When water soluble vitamins are consumed in excess of body needs, generally the excess is: A. excreted in the feces; B. stored in liver, bone, and adipose tissue; C. excreted in the urine; D. not absorbed; E. none of these. - ✔✔excreted in the urine Vitamin C acts as a coenzyme by maintaining iron in a reduced state in: A. collagen synthesis B. methylation of homocysteine C. release of energy from nutrients D. heme synthesis - ✔✔collagen synthesis As little as 10 mgs/day of vitamin C may be enough to prevent scurvy. A. True B. False - ✔✔true A major role for thiamin is: A. energy transformation; B. blood coagulation; C. collage formation; D. erythrocyte synthesis; E. none of above. - ✔✔energy transformation Why may alcoholics cause thiamin deficiency ? A. alcohol prevents thiamin uptake; B. alcohol prevents thiamin utilization; C. alcohol destroys thiamin activity; D. Both A and B; E. None of above. - ✔✔Both A and B alcohol prevents thiamin uptake; alcohol prevents thiamin utilization Riboflavin is required for: A. formation of active folate; B. conversion of tryptophan to niacin; C. function of B6; D. all of A, B & C; E. none of these - ✔✔all of A B and C formation of active folate; conversion of tryptophan to niacin; function of B6; Nicotinamide, but not nicotinic acid, is the form required for the synthesis of nicotinamide adenine dinucleotide. A. True B. False - ✔✔false How are the recommended intakes of niacin expressed (units)? A. grams B. niacin equivalents (mgs) C. in micrograms D. in milliliters - ✔✔niacin equivalents (mgs) List four water soluble vitamins that are required by pyruvate dehydrogenase complex. - ✔✔B1, B2, B3, pantothenic acid (B5) Bioavailability of biotin is near 0% from wheat. A. True B. False - ✔✔True (but it is near 100% from corn) Intake of raw egg white may cause deficiency of A. pantothenic acid B. thiamin; C. riboflavin; D. biotin; E. niacin - ✔✔Biotin Which of the following is one of the main functions of vitamin B6? A. coagulation B. depigmentation C. transamination D. antioxidation - ✔✔transamination Methionine cycle requires: A. B6; B. B12; C. folate; D. Niacin; E. All of above. - ✔✔all of the above B6; B12; folate; Niacin Which anemia is related to folate deficiency? A. Pernicious anemia B. Megaloblastic anemia C. Hypochromic microcytic anemia D. Hemodilution anemia - ✔✔megaloblastic anemia To protect against birth defects, a higher RDA of folic acid has been suggested for pregnant women A. True B. False - ✔✔True Vitamin B12 is only available from ___products. A. grain B. fruit C. animal D. vegetable - ✔✔animal Why the RDA of vitamin B12 is so low? A. In the liver, free cobalamin can be stored for years B. Little B12 in the body is degraded C. Whole body turnover is about 0.1% daily D. All of A, B, & C E. None of above - ✔✔all of a b and c In the liver, free cobalamin can be stored for years Little B12 in the body is degraded Whole body turnover is about 0.1% daily High dietary folate may cure megalobl

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