Question 1

Which of the following molecules synthesized with the help of vitamin C underscores the importance of vitamin C to fat metabolism?

Accepted Answer

A)  carnitine 
B)  collagen 
C)  tyrosine 
D)  norepinephrine 
A)  carnitine 
B)  collagen 
C)  tyrosine 
D)  norepinephrine

Question 2

Vitamin C acts as a cofactor by maintaining iron in a reduced state in:

Accepted Answer

A)  collagen synthesis. 
B)  methylation of homocysteine. 
C)  release of energy from nutrients. 
D)  red blood cell synthesis. 
A)  collagen synthesis. 
B)  methylation of homocysteine. 
C)  release of energy from nutrients. 
D)  red blood cell synthesis.

Question 3

The most common tests of thiamin status include all the following EXCEPT:

Accepted Answer

A)  static tests of urinary thiamin metabolites. 
B)  a static test of serum thiamin. 
C)  an in vitro functional test of RBC enzyme. 
D)  in vivo functional tests. 
A)  static tests of urinary thiamin metabolites. 
B)  a static test of serum thiamin. 
C)  an in vitro functional test of RBC enzyme. 
D)  in vivo functional tests.

Question 4

Which vitamin is most involved in amino acid metabolism?

Accepted Answer

A)  biotin 
B)  vitamin E 
C)  vitamin A 
D)  vitamin B6 
A)  biotin 
B)  vitamin E 
C)  vitamin A 
D)  vitamin B6

Question 5

Which vitamin has a reduced coenzyme form important for fatty acid and cholesterol synthesis that is a product of the pentose phosphate pathway?

Accepted Answer

A)  niacin 
B)  thiamin 
C)  riboflavin 
D)  vitamin C 
A)  niacin 
B)  thiamin 
C)  riboflavin 
D)  vitamin C

Question 6

The RDA for vitamin C for adult men is _____ and the UL is _____.

Accepted Answer

A)  75 mg, 500 mg 
B)  100 mg, 500 mg 
C)  90 mg, 2000 mg 
D)  200 mg, 2000 mg 
A)  75 mg, 500 mg 
B)  100 mg, 500 mg 
C)  90 mg, 2000 mg 
D)  200 mg, 2000 mg

Question 7

When water-soluble vitamins are consumed in excess of body needs, generally the excess is:

Accepted Answer

A)  excreted in the feces. 
B)  stored in liver, bone, and adipose tissue. 
C)  excreted in the urine. 
D)  not absorbed. 
A)  excreted in the feces. 
B)  stored in liver, bone, and adipose tissue. 
C)  excreted in the urine. 
D)  not absorbed.

Question 8

Ascorbic acid may act as a pro-oxidant by:

Accepted Answer

A)  reducing ferrous iron. 
B)  mobilizing ferric iron from storage. 
C)  reacting with transferrin-bound iron. 
D)  reducing dehydroascorbic acid. 
A)  reducing ferrous iron. 
B)  mobilizing ferric iron from storage. 
C)  reacting with transferrin-bound iron. 
D)  reducing dehydroascorbic acid.

Question 9

Which of the following would you find under B12-deficient conditions and the methyl trap hypothesis?

Accepted Answer

A)  accumulation of 5-methylene THF 
B)  depletion of homocysteine 
C)  accumulation of THF 
D)  accumulation of 5-methyl THF 
E)  more than one of the above 
A)  accumulation of 5-methylene THF 
B)  depletion of homocysteine 
C)  accumulation of THF 
D)  accumulation of 5-methyl THF 
E)  more than one of the above

Question 10

Although excess absorbed ascorbic acid is excreted in urine, the body has an estimated maximal body pool of about _____, which can be maintained with intakes of 100-200 mg vitamin C per day.

Accepted Answer

A)  500 mg 
B)  1000 mg 
C)  1500 mg 
D)  2000 mg 
A)  500 mg 
B)  1000 mg 
C)  1500 mg 
D)  2000 mg

Question 11

350 39. Elevated homocysteine levels can be due to all the following EXCEPT:

Accepted Answer

A)  low ascorbic acid. 
B)  low folacin. 
C)  low cobalamin. 
D)  low pyridoxine. 
A)  low ascorbic acid. 
B)  low folacin. 
C)  low cobalamin. 
D)  low pyridoxine.

Question 12

Erythrocyte transketolase activity is an assay to assess the status of:

Accepted Answer

A)  thiamin. 
B)  B6. 
C)  riboflavin. 
D)  B12. 
A)  thiamin. 
B)  B6. 
C)  riboflavin. 
D)  B12.

Question 13

When the diet is adequate in protein, the body can synthesize niacin from which amino acid?

Accepted Answer

A)  phenylalanine 
B)  valine 
C)  tyrosine 
D)  tryptophan 
A)  phenylalanine 
B)  valine 
C)  tyrosine 
D)  tryptophan

Question 14

Most animals synthesize their own ascorbic acid from _____.

Accepted Answer

A)  glucose 
B)  glutamine 
C)  glycogen 
D)  alanine 
A)  glucose 
B)  glutamine 
C)  glycogen 
D)  alanine

Question 15

When ascorbic acid becomes dehydroascorbic acid it has _____.

Accepted Answer

A)  lost 2 electrons 
B)  lost 1 electron 
C)  gained 2 electrons 
D)  gained 1 electron 
A)  lost 2 electrons 
B)  lost 1 electron 
C)  gained 2 electrons 
D)  gained 1 electron

Question 16

Large amounts of folic acid can mask a vitamin B12 deficiency and prevent _____ from resulting. Over time the symptoms unique to a vitamin B12 deficiency will occur, and these are related to the _____.

Accepted Answer

A)  microcytic anemia, muscular system 
B)  DNA and RNA synthesis, vascular system 
C)  one-carbon transfer, nervous system 
D)  macrocytic anemia, nervous system 
A)  microcytic anemia, muscular system 
B)  DNA and RNA synthesis, vascular system 
C)  one-carbon transfer, nervous system 
D)  macrocytic anemia, nervous system

Question 17

Which is NOT a fate of homocysteine in the cell?

Accepted Answer

A)  methylated to methionine 
B)  used to restore tetrahydrofolate 
C)  used to synthesize cysteine 
D)  used in the synthesis of leucine 
A)  methylated to methionine 
B)  used to restore tetrahydrofolate 
C)  used to synthesize cysteine 
D)  used in the synthesis of leucine

Question 18

Because vitamin B6 is involved in heme synthesis, a deficiency symptom is

Accepted Answer

A)  hypochromic, microcytic anemia. 
B)  seizures. 
C)  hyperhomocysteinemia. 
D)  impaired calcium metabolism. 
A)  hypochromic, microcytic anemia. 
B)  seizures. 
C)  hyperhomocysteinemia. 
D)  impaired calcium metabolism.

Which of the following molecules synthesized with the help of vitamin C underscores the importance of vitamin C to fat metabolism?

Vitamin C acts as a cofactor by maintaining iron in a reduced state in:

The most common tests of thiamin status include all the following EXCEPT:

Which vitamin is most involved in amino acid metabolism?

Which vitamin has a reduced coenzyme form important for fatty acid and cholesterol synthesis that is a product of the pentose phosphate pathway?

The RDA for vitamin C for adult men is _ and the UL is _.

When water-soluble vitamins are consumed in excess of body needs, generally the excess is:

Ascorbic acid may act as a pro-oxidant by:

Which of the following would you find under B₁₂-deficient conditions and the methyl trap hypothesis?

Although excess absorbed ascorbic acid is excreted in urine, the body has an estimated maximal body pool of about _____, which can be maintained with intakes of 100-200 mg vitamin C per day.

350 39. Elevated homocysteine levels can be due to all the following EXCEPT:

Erythrocyte transketolase activity is an assay to assess the status of:

When the diet is adequate in protein, the body can synthesize niacin from which amino acid?

Most animals synthesize their own ascorbic acid from _____.

When ascorbic acid becomes dehydroascorbic acid it has _____.

Large amounts of folic acid can mask a vitamin B₁₂ deficiency and prevent _ from resulting. Over time the symptoms unique to a vitamin B₁₂ deficiency will occur, and these are related to the _.

Which is NOT a fate of homocysteine in the cell?

Because vitamin B₆ is involved in heme synthesis, a deficiency symptom is

The Cell: a Microcosm of Life

The Digestive System:mechanism for Nourishing the Body

Carbohydrates

Fiber

Lipids

Protein

Integration and Regulation of Metabolismand the Impact of Exercise and Sport

Body Composition, Energy Expenditure, and Energy Balance

Fat-Soluble Vitamins

Major Minerals

Water and Electrolytes

Essential Trace and Ultratrace Minerals

Nonessential Trace and Ultratrace Minerals

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Exam 9: Water-Soluble Vitamins

Which of the following molecules synthesized with the help of vitamin C underscores the importance of vitamin C to fat metabolism?

Vitamin C acts as a cofactor by maintaining iron in a reduced state in:

The most common tests of thiamin status include all the following EXCEPT:

Which vitamin is most involved in amino acid metabolism?

Which vitamin has a reduced coenzyme form important for fatty acid and cholesterol synthesis that is a product of the pentose phosphate pathway?

The RDA for vitamin C for adult men is _____ and the UL is _____.

When water-soluble vitamins are consumed in excess of body needs, generally the excess is:

Ascorbic acid may act as a pro-oxidant by:

Which of the following would you find under B12-deficient conditions and the methyl trap hypothesis?

Although excess absorbed ascorbic acid is excreted in urine, the body has an estimated maximal body pool of about _____, which can be maintained with intakes of 100-200 mg vitamin C per day.

350 39. Elevated homocysteine levels can be due to all the following EXCEPT:

Erythrocyte transketolase activity is an assay to assess the status of:

When the diet is adequate in protein, the body can synthesize niacin from which amino acid?

Most animals synthesize their own ascorbic acid from _____.

When ascorbic acid becomes dehydroascorbic acid it has _____.

Large amounts of folic acid can mask a vitamin B12 deficiency and prevent _____ from resulting. Over time the symptoms unique to a vitamin B12 deficiency will occur, and these are related to the _____.

Which is NOT a fate of homocysteine in the cell?

Because vitamin B6 is involved in heme synthesis, a deficiency symptom is

The Cell: a Microcosm of Life

The Digestive System:mechanism for Nourishing the Body

Carbohydrates

Fiber

Lipids

Protein

Integration and Regulation of Metabolismand the Impact of Exercise and Sport

Body Composition, Energy Expenditure, and Energy Balance

Fat-Soluble Vitamins

Major Minerals

Water and Electrolytes

Essential Trace and Ultratrace Minerals

Nonessential Trace and Ultratrace Minerals

Filters

The RDA for vitamin C for adult men is _ and the UL is _.

Which of the following would you find under B₁₂-deficient conditions and the methyl trap hypothesis?

Large amounts of folic acid can mask a vitamin B₁₂ deficiency and prevent _ from resulting. Over time the symptoms unique to a vitamin B₁₂ deficiency will occur, and these are related to the _.

Because vitamin B₆ is involved in heme synthesis, a deficiency symptom is