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Ch. 10

STUDY
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Of the following commonly eaten foods, which makes the greatest contribution to riboflavin intake?
milk
What vitamin deficiency disease appeared in people who had subsisted on a diet high in corn and low in protein?
Pellagra
General characteristics of the water-soluble vitamins include all of the following except
they must be consumed daily.
What is meant by the bioavailability of a vitamin in food?
The amount absorbed and subsequently used by the body
Which of the following is a property of vitamin B12?
It is efficiently recycled by the body
Why are vegetarians at risk of developing a vitamin B12 deficiency?
Vegetarian diets provide insufficient amounts of the vitamin
Which of the following is a type of neural tube defect?
Spina bifida
Which of the following characteristics is shared by vitamins B6, B12, C and folate?
Consumption prevents anemia
Which of the following food groups ordinarily contains the highest amount of riboflavin when expressed per kcalorie?
Vegetables
of the following foods, which would be the only source of vitamin B12?
hotdogs
Which of the following provides the most thiamin per serving size?
ham
On a per-kcalorie basis, which of the following foods is richest in vitamin B6?
Vegetables
What is ariboflavonosis?
The vitamin B2 deficiency disease
Which of the following describes the basic function of a coenzyme?
Attaches to an enzyme and allows a chemical reaction to take place
Which of the following is indicative of a dietary deficiency of riboflavin?
Inflamed mouth membranes
Which of the following characteristics is shared by vitamin B12 and folate?
Both are required for nucleic acid synthesis
Beriberi results from a deficiency of
thiamin.
The appearance of vitamin B12 deficiency symptoms may be delayed due to high intake of supplements of
folate.
A protein that binds with biotin (thus inhibiting absorption) is found in which food?
Raw egg whites
A low-protein diet in which corn is a principal food has been found to cause a deficiency of what vitamin?
Niacin
A person with a disorder that limits absorption of bile is at increased risk for deficiency of
folate.
The chief symptoms of early vitamin B6 deficiency include
confusion and depression.
Pernicious anemia results from a deficiency of
vitamin B12.
Of the following, which is the richest food source of thiamin?
Soy milk
What is a precursor?
A substance that is used to synthesize another compound
Which of the following symptoms is indicative of a deficiency of vitamin C?
Subcutaneous pinpoint hemorrhages
What type of container is best for protecting the riboflavin content of milk?
Cardboard
The chief symptoms of early vitamin B6 deficiency include
confusion and depression.
Of the following commonly eaten foods, which makes the greatest contribution to riboflavin intake?
Milk
People with the condition known as iron overload may be adversely affected from taking supplements of
ascorbic acid
Folate deficiency has been reported in infants fed
goat's milk.
Which of the following is an essential nutrient for human beings?
folate
Which of the following vitamins is known to sustain substantial losses during processing of food?
Pantothenic acid
Among the following, which would be the best source of niacin equivalents?
chicken
Why might vitamin C supplements be beneficial in treating the common cold?
They deactivate histamine
Beriberi results from a deficiency of
thiamin.
Which of the following is a general function of vitamin C?
Antioxidant agent
Which of the following is known to significantly affect the body's folate status?
Some anticancer drugs
Which of the following is a property of vitamin B12?
It is efficiently recycled by the body
The appearance of vitamin B12 deficiency symptoms may be delayed due to high intake of supplements of
folate.
Which of the following foods is highest in folate?
Green, leafy vegetables
Of the following, which is the richest food source of thiamin?
Soy milk
Which of the following characteristics is shared by vitamins B6, B12, C and folate?
Consumption prevents anemia
Pteroylglutamic acid is known as
folate.
What is a free radical?
A molecule with at least one unpaired electron
Among the following compounds that serve as coenzymes in metabolism, which is considered a vitamin for human beings?
Biotin
which of the following is required for the absorption of dietary vitamin B12?
Intrinsic factor
What is a chief function of the B vitamins?
Coenzyme participation
Among all the vitamins, which is believed to be most vulnerable to interactions with drugs?
folate
A deficiency of what vitamin produces a characteristic cracking and redness at the corners of the mouth?
Riboflavin
Because of adverse interactions with other vitamins, a safe daily folate intake is up to
1,000 mg.
The Wernicke-Korsakoff syndrome may be treated with supplements of
thiamin.
Which of the following is frequently affected by deficiencies of the B vitamins?
Tongue
What is meant by the bioavailability of a vitamin in food?
The amount absorbed and subsequently used by the body
What vitamin is involved mainly with the replacement of red blood cells and digestive tract cells?
Folate
A person who shuns dairy and spends most of her time indoors would likely benefit from a supplement of
vitamin D.
Moderate intakes of which of the following would provide sufficient amounts of vitamin C?
Potatoes
which of the following is the coenzyme form of thiamin?
Thiamin pyrophosphate
Which of the following vitamins is stored primarily in muscle tissue?
Vitamin B6
Which of the following is a type of neural tube defect?
Spina bifida
The protein that requires ascorbic acid for its formation is
collagen.
Riboflavin needs are more difficult to meet when the diet is low in
dairy foods.
Which of the following is an early sign of vitamin C deficiency?
Bleeding gums
Why are vegetarians at risk of developing a vitamin B12 deficiency?
Vegetarian diets provide insufficient amounts of the vitamin
Which of the following food groups is a rich source of vitamin C?
Fruit group
Research has shown that the risk for neural tube defects is lowered by taking supplements of
folate.
Riboflavin is most easily destroyed when exposed to
ultraviolet light.
Which of the following describes the basic function of a coenzyme?
Attaches to an enzyme and allows a chemical reaction to take place
The vitamin deficiency disease pellagra means
"rough skin."
Which of the following substances is known to adversely affect folate utilization?
Regular use of antacids
Which of the following contains the highest concentration of thiamin in muscle tissue?
Pig
Which of the following foods provides ample amounts of vitamin C?
Broccoli
What is the most likely reason for the development of a vitamin B12 deficiency?
Inadequate absorption
Which of the following is a characteristic of thiamin nutrition?
t is an integral part of the nerve cell membrane
A low-protein diet in which corn is a principal food has been found to cause a deficiency of what vitamin?
Niacin
Which of the following characteristics is shared by vitamin B12 and folate?
Both are required for nucleic acid synthesis
Which of the following is a characteristic of vitamin B12?
It is inactivated when the food is heated in a microwave
Approximately what percentage of dietary folate is bioavailable?
50
Which of the following is a common treatment for pernicious anemia caused by inadequate absorption?
Injection of cobalamin
General characteristics of the water-soluble vitamins include all of the following except
they must be consumed daily.
Physiological stresses such as blood loss, burns, measles, and cancer are known particularly to increase the risk of deficiency for
folate.
Which of the following is a feature of vitamins?
The quantities present in foods are measured in micrograms or milligrams
A person with a disorder that limits absorption of bile is at increased risk for deficiency of
folate
Which of the following is indicative of a dietary deficiency of riboflavin?
Inflamed mouth membranes
When taken in large doses, which of the following vitamins is associated with liver injury and peptic ulcers?
Niacin
What is the primary excretory route for the water-soluble vitamins?
Kidney
Biotin can be synthesized by
intestinal bacteria.
How does the method of cooking affect thiamin stability?
Microwaving the food conserves much of the thiamin
When thiamin is consumed in excess of needs, how does the body treat the excess?
Excreted primarily in the urine