Vitamins are essential because the organism

can synthesize these compounds partially

can't synthesize these compounds at all

can synthesize these compounds partially

can't synthesize these compounds in the adequate amounts

Selenium is an essential component of the enzyme glutathione peroxidase which

reduces toxic hydoperoxycompounds in tissues

scavenges toxic hydoperoxycompounds in tissues

reduces toxic hydoperoxycompounds in tissues

oxidizes toxic hydoperoxycompounds in tissues

The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk become

colorless on oxidation and regained its color on reduction with Zn in acid

colorless on reduction with Zn in acid and regained its color on re-oxidation

colorless on oxidation and regained its color on reduction with Zn in acid

more deep in color on reduction with Zn in acid and regained its color on re-oxidation

more deep in color on oxidation and regained its color on reduction with Zn in acid

Ascorbic acid acts as an

oxidizing and reducing agent both

Dihydroorotate dehydrogenase contains

2 flavins and 4 atoms of iron per molecule

4 flavins and 4 atoms of iron per molecule

2 flavins and 4 atoms of iron per molecule

2 flavins and 2 atoms of iron per molecule

4 flavins and 2 atoms of iron per molecule

Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked at

both ends by one disulfide bond

either end via two disulfide bonds

either end via a single disulfide bond

both ends by two disulfide bonds

49 + Mcqs in Vitamins and Coenzymes in Biochemistry Page 1 McqOptions

1.	Vitamin B (Cobalamin) is only synthesized by
A.	fishes
B.	micro-organisms
C.	plants
D.	animals
Answer» C. plants

Discussion

2.	Vitamin B is useful in the prevention and treatment of
A.	pernicious anemia
B.	scurvy
C.	cataract
D.	beri-beri
Answer» B. scurvy

Discussion

3.	The most prominent role that tocopherol has in systems is as a strong
A.	antioxidants
B.	reducing agent
C.	oxidizing agent
D.	all of these
Answer» B. reducing agent

Discussion

4.	In the co-enzyme Bthe position occupied by a cyanide ion in vitamin B is bonded directly to the __________ of the ribose of adenosine.
A.	adenine
B.	5-6 dimethylbenzimidazole
C.	hydroxycobalamin
D.	cyanocobalamin
Answer» B. 5-6 dimethylbenzimidazole

Discussion

5.	Which of the following compounds/(s) belong/(s) to the vitamin B group?
A.	Pyridoxal
B.	Pyridoxine
C.	Pyridoxamine
D.	All of these
Answer» E.

Discussion

6.	What metal ion is specifically bound by vitamin B?
A.	Cobalt
B.	Copper
C.	Zinc
D.	Iron
Answer» B. Copper

Discussion

7.	ACP has its molecular weight as around
A.	9000
B.	19000
C.	39000
D.	90,000
Answer» B. 19000

Discussion

8.	Vitamin K was first isolated from alfalalfa and has the phytyl side chain consisting of
A.	four isoprene units
B.	six isoprene units
C.	nine isoprene units
D.	four isoprene units
Answer» B. six isoprene units

Discussion

9.	Lipoic acid exists in
A.	oxidized form
B.	reduced form
C.	oxidized and reduced form both
D.	none of these
Answer» D. none of these

Discussion

10.	Vitamin B₁₂ is useful in the prevention and treatment of
A.	pernicious anemia
B.	scurvy
C.	cataract
D.	beri-beri
Answer» B. scurvy

Discussion

11.	In the co-enzyme B₁₂the position occupied by a cyanide ion in vitamin B₁₂ is bonded directly to the __________ of the ribose of adenosine.
A.	adenine
B.	5-6 dimethylbenzimidazole
C.	hydroxycobalamin
D.	cyanocobalamin
Answer» B. 5-6 dimethylbenzimidazole

Discussion

12.	Vitamin B₁₂ (Cobalamin) is only synthesized by
A.	fishes
B.	micro-organisms
C.	plants
D.	animals
Answer» C. plants

Discussion

13.	The absence of ascorbic acid in the human diet gives rise to
A.	rickets
B.	pernicious anemia
C.	cataract
D.	beri-beri
Answer» C. cataract

Discussion

14.	Vitamins are essential because the organism
A.	can't synthesize these compounds at all
B.	can synthesize these compounds partially
C.	can't synthesize these compounds in the adequate amounts
D.	none of the above
Answer» B. can synthesize these compounds partially

Discussion

15.	Vitamin-C is considered as a
A.	water soluble
B.	fat soluble
C.	fat and water soluble
D.	none of these
Answer» B. fat soluble

Discussion

16.	The vitamin niacin is part of the __________ molecule.
A.	ferredoxin
B.	pyridoxal phosphate
C.	pyrophosphate
D.	NAD
E.	<sup>+</sup>
Answer» E. <sup>+</sup>

Discussion

17.	Which of these hormones is a catecholamine?
A.	Follitropin
B.	Norepinephrine
C.	Tetraiodothyronine
D.	Tetrahydrofolate
Answer» C. Tetraiodothyronine

Discussion

18.	E.coli ACP has its molecular weight as around
A.	9000
B.	19000
C.	39000
D.	90,000
Answer» B. 19000

Discussion

19.	An early sign of retinol deficiencies in man is
A.	night blindness
B.	keratinization
C.	xeropthalmia
D.	none of these
Answer» B. keratinization

Discussion

20.	What compound of raw egg white causes a syndrome similar to vitamin B deficiency?
A.	Avidin
B.	Betabindin
C.	Ovalbumin
D.	Albumin
Answer» B. Betabindin

Discussion

21.	The vitamin riboflavin is part of the __________ molecule.
A.	ferredoxin
B.	FAD
C.	pyridoxal phosphat
D.	pyrophosphate
Answer» C. pyridoxal phosphat

Discussion

22.	The most prominent role that tocopherol has in in-vitro systems is as a strong
A.	antioxidants
B.	reducing agent
C.	oxidizing agent
D.	all of these
Answer» B. reducing agent

Discussion

23.	An enzyme, L-folate reductase reduces folic acid to
A.	hydrofolic acid
B.	dihydrofolic acid
C.	trihydrofolic acid
D.	tetrahydrofolic acid
Answer» C. trihydrofolic acid

Discussion

24.	Biotin occurs mainly in combined forms bound to protein through
A.	-N-lysine moiety
B.	-S-lysine moiety
C.	-N-biotinyl-L-lysine
D.	-N-lipoyl - L-lysine
Answer» B. -S-lysine moiety

Discussion

25.	Lipoic acid is a co-factor of the
A.	pyruvic dehydrogenase
B.	-ketoglutaric dehydrogenase
C.	both (a) and (b)
D.	di-hydroorotate dehydrogenase
Answer» D. di-hydroorotate dehydrogenase

Discussion

26.	-carotene together with -carotene, -carotene and cryptoxanthine are synthesized by
A.	plants
B.	animal
C.	plants and animals both
D.	none of these
Answer» B. animal

Discussion

27.	The symptoms of retinol excess are
A.	bone fragility
B.	nausea
C.	weakness
D.	all of these
Answer» E.

Discussion

28.	Main function of insulin hormone is to
A.	increase glycogen in liver
B.	decrease glycogen in liver
C.	increase blood sugar
D.	decrease blood sugar
Answer» E.

Discussion

29.	A deficiency of thiamin produces the disease known as
A.	beri-beri
B.	scurvy
C.	cataract
D.	anemia
Answer» B. scurvy

Discussion

30.	Acyl carrier protein (ACP) plays an important role in the biosynthesis of
A.	fatty acids
B.	amino acids
C.	sugars
D.	carbohydrates
Answer» B. amino acids

Discussion

31.	The occurrence of metals such as iron or molybdenum in some flavoproteins can
A.	stabilize the semiquinone
B.	de-stabilize the semiquinone
C.	form chelation
D.	all of these
Answer» B. de-stabilize the semiquinone

Discussion

32.	A deficiency of niacin causes
A.	pellagra
B.	scurvy
C.	cataract
D.	anemia
Answer» B. scurvy

Discussion

33.	Selenium is an essential component of the enzyme glutathione peroxidase which
A.	scavenges toxic hydoperoxycompounds in tissues
B.	reduces toxic hydoperoxycompounds in tissues
C.	oxidizes toxic hydoperoxycompounds in tissues
D.	none of the above
Answer» B. reduces toxic hydoperoxycompounds in tissues

Discussion

34.	Who discovered vitamin C (ascorbic acid)?
A.	Paul Berg
B.	Linus Pauling
C.	Albert Szent-Gyorgyi
D.	Kerry Mull is
Answer» D. Kerry Mull is

Discussion

35.	Which of these is a vitamin A precursor?
A.	Cobalamin
B.	Pyridoxine
C.	Beta-Carotene
D.	Thiamine
Answer» D. Thiamine

Discussion

36.	Which of these molecules is vitamin H?
A.	Biotin
B.	Carnitine
C.	Folic acid
D.	None of these
Answer» B. Carnitine

Discussion

37.	Vitamin-D deficiency can cause
A.	rickets
B.	pernicious anemia
C.	cataract
D.	beri-beri
Answer» B. pernicious anemia

Discussion

38.	A deficiency of Vitamin K results in a decreased level of
A.	prothrombin
B.	thrombin
C.	fibrin
D.	fibrinogen
Answer» B. thrombin

Discussion

39.	The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk become
A.	colorless on reduction with Zn in acid and regained its color on re-oxidation
B.	colorless on oxidation and regained its color on reduction with Zn in acid
C.	more deep in color on reduction with Zn in acid and regained its color on re-oxidation
D.	more deep in color on oxidation and regained its color on reduction with Zn in acid
Answer» B. colorless on oxidation and regained its color on reduction with Zn in acid

Discussion

40.	Which of the following compounds/(s) belong/(s) to the vitamin B₆ group?
A.	Pyridoxal
B.	Pyridoxine
C.	Pyridoxamine
D.	All of these
Answer» E.

Discussion

41.	What metal ion is specifically bound by vitamin B₁₂?
A.	Cobalt
B.	Copper
C.	Zinc
D.	Iron
Answer» B. Copper

Discussion

42.	Ascorbic acid acts as an
A.	reducing agent
B.	oxidizing agent
C.	oxidizing and reducing agent both
D.	none of the above
Answer» B. oxidizing agent

Discussion

43.	Which of these is a symptom of vitamin A deficiency?
A.	Osteoporosis
B.	Impaired taste perception
C.	Blindness
D.	Impaired blood clotting
Answer» D. Impaired blood clotting

Discussion

44.	Dihydroorotate dehydrogenase contains
A.	4 flavins and 4 atoms of iron per molecule
B.	2 flavins and 4 atoms of iron per molecule
C.	2 flavins and 2 atoms of iron per molecule
D.	4 flavins and 2 atoms of iron per molecule
Answer» B. 2 flavins and 4 atoms of iron per molecule

Discussion

45.	A fat-soluble vitamin that regulates blood clotting is
A.	vitamin A
B.	vitamin K
C.	vitamin C
D.	niacin
Answer» C. vitamin C

Discussion

46.	Vitamin K₁ was first isolated from alfalalfa and has the phytyl side chain consisting of
A.	four isoprene units
B.	six isoprene units
C.	nine isoprene units
D.	four isoprene units
Answer» B. six isoprene units

Discussion

47.	Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked at
A.	both ends by one disulfide bond
B.	either end via two disulfide bonds
C.	either end via a single disulfide bond
D.	both ends by two disulfide bonds
Answer» E.

Discussion

48.	An example of a digestive hormone is
A.	lipase
B.	pepsin
C.	amylase
D.	gastrin
Answer» E.

Discussion

49.	In one iron-metalloflavoprotein, the iron is present as a
A.	heme-protein
B.	nonheme type
C.	both (a) and (b)
D.	flavin moiety
Answer» B. nonheme type

Discussion

Explore topic-wise MCQs in Biochemistry.

Vitamin B (Cobalamin) is only synthesized by

Vitamin B is useful in the prevention and treatment of

The most prominent role that tocopherol has in systems is as a strong

In the co-enzyme Bthe position occupied by a cyanide ion in vitamin B is bonded directly to the __________ of the ribose of adenosine.

Which of the following compounds/(s) belong/(s) to the vitamin B group?

What metal ion is specifically bound by vitamin B?

ACP has its molecular weight as around

Vitamin K was first isolated from alfalalfa and has the phytyl side chain consisting of

Lipoic acid exists in

Vitamin B12 is useful in the prevention and treatment of

In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine.

Vitamin B12 (Cobalamin) is only synthesized by

The absence of ascorbic acid in the human diet gives rise to

Vitamins are essential because the organism

Vitamin-C is considered as a

The vitamin niacin is part of the __________ molecule.

Which of these hormones is a catecholamine?

E.coli ACP has its molecular weight as around

An early sign of retinol deficiencies in man is

What compound of raw egg white causes a syndrome similar to vitamin B deficiency?

The vitamin riboflavin is part of the __________ molecule.

The most prominent role that tocopherol has in in-vitro systems is as a strong

An enzyme, L-folate reductase reduces folic acid to

Biotin occurs mainly in combined forms bound to protein through

Lipoic acid is a co-factor of the

-carotene together with -carotene, -carotene and cryptoxanthine are synthesized by

The symptoms of retinol excess are

Main function of insulin hormone is to

A deficiency of thiamin produces the disease known as

Acyl carrier protein (ACP) plays an important role in the biosynthesis of

The occurrence of metals such as iron or molybdenum in some flavoproteins can

A deficiency of niacin causes

Selenium is an essential component of the enzyme glutathione peroxidase which

Who discovered vitamin C (ascorbic acid)?

Which of these is a vitamin A precursor?

Which of these molecules is vitamin H?

Vitamin-D deficiency can cause

A deficiency of Vitamin K results in a decreased level of

The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk become

Which of the following compounds/(s) belong/(s) to the vitamin B6 group?

What metal ion is specifically bound by vitamin B12?

Ascorbic acid acts as an

Which of these is a symptom of vitamin A deficiency?

Dihydroorotate dehydrogenase contains

A fat-soluble vitamin that regulates blood clotting is

Vitamin K1 was first isolated from alfalalfa and has the phytyl side chain consisting of

Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked at

An example of a digestive hormone is

In one iron-metalloflavoprotein, the iron is present as a

Vitamin B₁₂ is useful in the prevention and treatment of

In the co-enzyme B₁₂the position occupied by a cyanide ion in vitamin B₁₂ is bonded directly to the __________ of the ribose of adenosine.

Vitamin B₁₂ (Cobalamin) is only synthesized by

Which of the following compounds/(s) belong/(s) to the vitamin B₆ group?

What metal ion is specifically bound by vitamin B₁₂?

Vitamin K₁ was first isolated from alfalalfa and has the phytyl side chain consisting of