All of the following are true regarding niacin EXCEPT:
1.a deficiency results in pellagra.
2.its precursor is tryptophan.
3.high doses result in flushing.
4.high doses lower HDL-cholesterol levels.
Q. 2All of the following are true regarding water-soluble vitamins EXCEPT:
1.excess amounts are excreted in the urine.
2.they are stored in body fat, the liver, and other parts of the body.
3.deficiency symptoms develop within weeks or months.
4.they include the B-complex vitamins and vitamin C.
Q. 3All of the following are true regarding fat-soluble vitamins EXCEPT:
1.they are stored in body fat, the liver, and other parts of the body.
2.deficiency symptoms take longer to develop than those associated with water-soluble vitamins.
3.they can be highly toxic if consumed in excess.
4.they include vitamins A, C, D, E, and K.
Q. 4All of the following are true regarding vitamins EXCEPT:
1.they are considered essential because the body cannot produce them.
2.if adequate amounts are not consumed, deficiency diseases develop.
3.they perform specific functions in the body.
4.eating at least one serving of fruit or vegetable a day prevents deficiencies.
Q. 5Chemical substances that are missing an electron and are prone to oxidizing nearby atoms are called:
1.antioxidants.
2.provitamins.
3.precursors.
4.free radicals.
Q. 6Another name for a provitamin, a nutrient that can be converted into another nutrient, is:
1.coenzyme.
2.precursor.
3.predecessor.
4.antioxidant.
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