Quiz: Water-Soluble Vitamins
Score for this quiz:68out of 70
Question 1
2/ 2pts
People with a condition known as iron overload may be adversely affected from taking supplements of
niacin.
retinol.
cobalamin.
C !
ascorbic acid.
Question 2
2/ 2pts
All of the following are properties of folate in nutrition EXCEPT
it is needed for proper functioning of vitamin B12.
C !
it functions primarily in the transfer of amino groups."
the coenzyme of folate requires vitamin B12"to function properly.
it requires enzymes on the intestinal mucosa to enhance its absorption from most foods."
Question 3
2/ 2pts
Pteroylglutamic acid is known as
C !
folate.
choline.
inositol.
pyridoxamine.
Question 4
2/ 2pts
Which vitamin is most involved in amino acid metabolism?
biotin
vitamin E
vitamin A
C !
vitamin B6
Question 5
2/ 2pts
Which of the following describes the basic function of a coenzyme?
Attaches to RNA to assist in the synthesis of an enzyme.
Attaches to cell membranes to assist in uptake of an enzyme."
C !
Attaches to an enzyme and allows a chemical reaction to take place."
Attaches to an enzyme, which allows for transport of the enzyme through the circulation."
Question 6
2/ 2pts
A major role for thiamin is ____.
C !
energy production
blood coagulation
collagen formation
erythrocyte synthesis
Question 7
2/ 2pts
A major function of B vitamins is to serve as ____.
antibodies
a source of energy
C !
a part of a coenzyme
electrolytes
Question 8
2/ 2pts
Tetrahydrofolate is vitally important for dividing cells during growth and cancer and knowledge of this
need is used in cancer treatment by giving the drug methotrexate to inhibit the enzyme ____.
folylpolyglutamate synthetase
C !
dihydrofolate reductase
formimino glutamate
conjugase
Question 9
2/ 2pts
Vitamin C’s actual participation in biochemical reactions usually involves its antioxidant ability. Choose
the description of this activity.
donates an electron or electrons to oxidize a mineral cofactor
accepts an electron or electrons to reduce a mineral cofactor
C !
donates an electron or electrons to reduce a mineral cofactor
accepts an electron from the quinone form of vitamin E
Question 10
2/ 2pts
FMN and FAD act as prosthetic groups for enzymes called ____.
apoenzymes
flavokinases
bound enzymes
C !
flavoproteins
Question 11
2/ 2pts
Which of the following vitamins is stored primarily in muscle tissue?
Biotin
Folate
C !
Vitamin B6
Pantothenic acid
Question 12
2/ 2pts
Features of biotin in nutrition include all of the following EXCEPT
it functions in the breakdown of amino acids and fatty acids."
it functions as a carrier of carbon dioxide in energy metabolism."
a deficiency can be induced by ingesting large quantities of raw egg whites.
C !
a deficiency can be induced by ingesting large amounts of thiamin and folic acid, which interfere with its
absorption."
Question 13
2/ 2pts
What is meant by the bioavailability of a vitamin in food?
The total amount available from plant and animal food.
C !
The amount absorbed an subsequently used by the body.
The amount that escapes destruction from food poisoning.
The number of different chemical forms of the same vitamin.
Question 14
2/ 2pts
Decarboxylation of pyruvate is achieved by the interaction of pantothenic acid with thiamin, riboflavin,
and ____.
ascorbic acid
vitamin B12
folate
C !
niacin
Question 15
2/ 2pts
The last vitamin to be discovered was ____.
pantothenic acid
folate
vitamin B6
C !
vitamin B12
Question 16
2/ 2pts
What vitamin forms a part of coenzyme A?
Biotin
Folate
Riboflavin
C !
Pantothenic acid
Question 17
2/ 2pts
Folate is vitally important for dividing cells during growth and cancer because of its essential role in the
synthesis of ____.
lipid bilayers
mitochondria
lysosomes and peroxisomes
C !
purines and pyrimidines
Question 18
2/ 2pts
Consumption of raw eggs causes a biotin deficiency due to the binding of ____ to the biotin, thus
preventing its absorption.
heparin
carnitine
C !
avidin
pyruvate
Question 19
2/ 2pts
A consequence of thiamin deficiency is ____.
pellagra
megaloblastic anemia
C !
beriberi
rickets
Question 20
2/ 2pts
Erythrocyte transketolase activity is an assay to assess the status of ____.
C !
thiamin
B6
riboflavin
B12
Question 21
2/ 2pts
All of the following are required for efficient dietary absorption of vitamin B12"EXCEPT
pepsin.
intrinsic factor.
hydrochloric acid.
C !
mucosal cobalaminase."
Question 22
2/ 2pts
Riboflavin is found most often in ____.
meats
green leafy vegetables
seafood
C !
milk and milk products
Question 23
2/ 2pts
What is the primary chemical reaction in which thiamin participates as a coenzyme?
Transfers amine groups in the synthesis of amino acids."
Transfers hydrogen atoms in the synthesis of erythrocytes."
Assists in addition of methyl groups to compounds involved in energy metabolism.
C !
Assists in removal of one-carbon units from compounds involved in energy metabolism."
Question 24
2/ 2pts
Which water-soluble vitamin contributes to “intracellular cement” in the formation of scar tissue and
wound healing?
thiamin
riboflavin
C !
vitamin C
vitamin B12
Question 25
2/ 2pts
A genetic polymorphism that decreases the activity of N5,N10"methylene tetrahydrofolate reductase has
been identified. This would cause ____.
an accumulation of 5-methyl THF
C !
an increase in the homocysteine concentration in the cell
a decreased risk for megaloblastic anemia
a decreased risk for heart disease
Question 26
2/ 2pts
Which of the following explains why B vitamin deficiencies lead to lack of energy?
B vitamins are a source of kilocalories.
Absorption of carbohydrates and fats is decreased."
Oxygen for energy metabolism cannot be transported to the cells.
C !
Coenzymes needed for energy metabolism are produced in insufficient amounts."
Question 27
2/ 2pts
The best sources of niacin are ____.
C !
fish and meats
beans
green leafy vegetables
yellow vegetables
Question 28
2/ 2pts
Which of the water-soluble vitamins is found widely distributed in all plant and animal foods, which
makes a deficiency unlikely?
riboflavin
folic acid
C !
pantothenic acid
pyridoxine
Question 29
0/ 2pts
Thiamin is important to fatty acid synthesis due to its requirement as a coenzyme for the pentose
phosphate pathway enzyme ____.
Y Answered
dopamine monooxygenase
Correct Answer
transketolase
alpha-ketoglutarate dehydrogenase
phenylalanine hydroxylase
Question 30
2/ 2pts
Which of the following vitamins is usually found in a form that is bound to one or more glutamic acid
molecules in food?
C !
Folate
Thiamin
Vitamin B6
Ascorbic acid
Question 31
2/ 2pts
Cheilosis is a symptom of a dietary deficiency of which vitamin?
niacin
ascorbic acid
C !
riboflavin
biotin
Question 32
2/ 2pts
When the diet is adequate in protein, the body can synthesize niacin from which amino acid?
phenylalanine
valine
tyrosine
C !
tryptophan
Question 33
2/ 2pts
How do we know that folate fortification has improved the biochemical folate status of Americans?
More folate is being consumed.
More Americans are meeting recommendations for folate intakes.
C !
There is a decline in NTDs.
RBC folate levels have increased.
Question 34
2/ 2pts
Beriberi is a deficiency syndrome associated with ____.
vitamin B12
C !
vitamin B1
vitamin B2
vitamin B6
Question 35
2/ 2pts
Which of the following is the coenzyme form of thiamin?
Thiaminacide
C !
Thiamin pyrophosphate
Thiamin adenine dinucleotide
Thiamin flavin dinucleotide"
Quiz Score:68out of 70
