CNSC Exam, Ch. 8: Vitamins and Trace Elements questions with correct answers

What amount of retinol is equivalent to 24mcg of beta-carotene from food? A) 2mcg; B) 4mcg; C)2mg; D) 1mg CORRECT ANSWER A) 2mcg. One mcg retinol has the vitamin A activity of 12mcg beta-carotene Which of the following nutrients does NOT engage in conversion of homocysteine to methionine? A) Choline; B) Vitamin D; C) Vitamin B12; D) Folate CORRECT ANSWER B) Vitamin D Which of the following trace elements is regulated at the level of absorption but not excretion? A) Zinc; B) Copper; C) Manganese; D) Iron CORRECT ANSWER D) Iron. It is very difficult to eliminate iron except in conditions of blood loss Generally vitamin A exists as what in animal tissue and what in plants? CORRECT ANSWER Retinoids in animal tissue; carotenoids in plants Most stable form of vitamin A CORRECT ANSWER retinyl ester Chronic intake of retinol may contribute to CORRECT ANSWER development of osteoporotic hip fractures Active form of Vitamin D CORRECT ANSWER Calcitriol Parathyroid hormone increases/decreases blood calcium levels CORRECT ANSWER Increases