Why is taking excess amounts of fat-soluble vitamins more likely to cause toxicity than taking excesses of water-soluble vitamins?
A. In general, excesses of fat-soluble vitamins cannot be excreted as easily as water-soluble vitamins.
B. In general, water-soluble vitamins are more likely to be stored in the body than fat-soluble vitamins.
C. The body has higher requirements for water-soluble vitamins.
D. The body has higher requirements for fat-soluble vitamins.
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Which of the following statements is true?
A. Retinol is found only in plant foods.
B. Certain carotenoids are precursors for preformed vitamin A.
C. Vitamin A is necessary for normal blood clotting.
D. In children, vitamin A deficiency is called rickets.
Which of the following foods is a naturally good source of vitamin D?
A. Fatty fish and fish oils
B. Dark orange and yellow vegetables
C. Whole-grain breads and cereals
D. Red meat
The body needs folate to produce a coenzyme that
A. metabolizes vitamin E.
B. transmits nervous impulses.
C. helps form DNA.
D. protects fatty acids from oxidation.
分析和研究食品的酸度，首先应区分的不同概念有（）。
A. 总酸度
B. 有效酸度
C. 挥发酸
D. 牛乳酸度
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