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.
查看答案
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
牛乳酸度的表示方法有（）。
A. 用°T表示牛乳的酸度
B. 用乳酸的百分数表示
C. 挥发酸度
D. 有效酸度
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