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Biochemistry ( Part- 5 ) MCQs with Answers

BIOCHEMISTRY

Q.1-Which of the followings is a simple sugar or monosaccharide?
a) Galactose
b) Lactose
c) Maltose
d) Sucrose

Q.2- What is the molecular formula for Glucose?
a) CH3OH
b) C6H1206
c) C12H22O11
d) C6H12O5

Q.3- Maltose is composed of which two sugars?
a) Glucose and Glucose
b) Glucose and Galactose
c) Glucose and Fructose
d) Fructose and Galactose

Q.4- In which form is Glucose stored in animals?
a) Starch
b) Glycogen
c) Dextrins
d) Cellulose

Q.5-All are glucosans (polymers of glucose) except
a) Glycogen
b) Inulin
c) Starch
d) Cellulose

Q.6- Choose the Aldose sugar out of the followings
A) Sucrose
b) Ribulose
c) Fructose
d) Ribose

Q.7- Choose the keto triose
a) Glyceraldehyde
b) Erythrose
c) Dihydroxyacetone
d) Arabinose

Q.8 Pentose sugar present in the heart muscle is
a) Xylose
b) Lyxose
c) Xylulose
d) Aldose

Q.9- α-D Glucose and β- D glucose are
a) Epimers
B) Keto- Aldose Isomers
c) Anomers
d) Optical isomers

Q.10- All tests are negative for sucrose except
a) Benedict
b) Seliwanoff
c) Barfoed
d) Osazone

Q.11- Glucose can have ————- isomers due to the presence of 4 asymmetric carbon atoms
a) 4
b) 12
c) 8
d) 16

Q.12- Galactose and Glucose are
a) Epimers
b) Isomers
c) Anomers
d) Ketose- Aldose isomers

Q.13- The compounds having same structural formula but differing in configuration around one carbon atom are called
a) Optical isomers
b) Stereo isomers
c) Anomers
d) Epimers

Q.14- What does the following equation represent?
α-D Glucose +112ο→+52.5ο→ +19οβ- D glucose
a) Stereo isomerism
b) Mutarotation
c) Optical isomerism
d) Epimerization

Q.15- The carbohydrate of blood group Substance is
a) Fucose
b) Xylose
c) Lyxose
d) Fructose

Q.16- Dulcitol is a –
a) Sugar acid
b) Amino sugar
c) Deoxysugars
d) Sugar alcohol

Q.17 which of the following amino acids would be found in the highest concentration in the serum?
a) Alanine and Glutamine
b) Arginine and Ornithine
c) Glutamate and Aspartate
d) Branched chain amino acids

Q.18 which of the following enzymes requires adenosine triphosphate (ATP) to mediate its Reactions?
a) Argino Succinate lyase
b) Argino Succinate synthetase
c) Arginase
d) Glutaminase

Q.19 A mutation has changed an isoleucine residue of a protein to Glutamic acid, which statement best describes its location in a hydrophilic exterior
a) On the surface since it is hydrophilic in nature
b) Inside the core of the protein since it is hydrophobic in nature
c) Anywhere inside or outside
d) Inside the core of protein since it has a polar but uncharged side chain

Q. 20 Glycine and proline are the most abundant amino acids in the structure of
a) Hemoglobin
b) Myoglobin
c) Insulin
d) Collagen

Q.21 Some proteins contain additional amino acids that arise by modification of an amino acid already present in a peptide, examples include
A) 4 -hydroxy proline
b) 5- hydroxy Lysine
c) Gamma Amino Butyric Acid
d) All of the above

Q.22 Which out of the following amino acids is a precursor for a mediator of allergies and inflammation?
a) Histidine
b) Tyrosine
c) Phenyl Alanine
d) Tryptophan

Q.23 Mother of a mal nourished child has been instructed to include a complete protein in diet for her child, which out of the followings proteins should be recommended?
a) Pulses
b) Wheat
c) Soy Protein
d) Milk

Q.24 All of the below mentioned amino acids can participate in hydrogen bonding except one
a) Serine
b) Cysteine
c) Threonine
d) Valine

Q.25 All of the following amino acids are both glucogenic as well as ketogenic except –
a) Isoleucine
b) Leucine
c) Tyrosine
d) Phenyl alanine

Q.26 Which out of the following amino acid is a precursor of niacin (Vitamin)?
a) Tyrosine
b) Threonine
c) Tryptophan
d) Phenylalanine

Q.27 The greatest buffering capacity at physiological p H would be provided by a protein rich in which of the following amino acids?
a) Serine
b) Cysteine
c) Alanine
d) Histidine

Q.28 which of the following peptides is cyclic in nature-?
a) Glutathione b) Gramicidin
c) Met encephalin d) Leuencephalin

Q.29 Which out of the followings is not a fibrous protein?
a) Carbonic anhydrase
b) Collagen
c) Fibrinogen
d) Keratin

Q.30 Which of the following amino acid is a limiting amino acid in pulses?
a) Leucine
b) Lysine
c) Methionine
d) Glutamine

Q.31 Which out of the following is not a Haemo protein?
a) Catalase
b) Myeloperoxidase
c) Glutathione peroxidase
d) Aconitase

Q.32 All the below mentioned proteins are metalloproteins except

a) Carbonic anhydrase
b) Xanthine oxidase
c) Lactate dehydrogenase
d) Superoxide dismutase

Q.33 Which out of the following is a peptide antibiotic?
a) Erythromycin
b) Gramicidin
c) Ciprofloxacin
d) Tetracycline

Q.34 Which of the following amino acids is most compatible with an α- helical structure?
a) Tryptophan
b) Alanine
c) Leucine
d) Proline

Q.35 The highest concentration of cystine can be found in
A) Melanin
b) Keratin
c) Collagen
d) Myosin

Q.36 In scurvy, which amino acid that is normally part of collagen is not synthesized?
a) Hydroxy Tryptophan
b) Hydroxy Tyrosine
c) Hydroxy Alanine
d) Hydroxy Proline

Q.37 which one of the following amino acids may be considered a hydrophobic amino acid at physiological p H of 7.4?
a) Isoleucine ) Arginine
c) Aspartic acid d) Threonine

Q.38 Which of the characteristics below Apply to amino acid Glycine?
a) Optically inactive
b) Hydrophilic, basic and charged
c) Hydrophobic
d) Hydrophilic, acidic and charged

Q.39 Which of the following amino acids in myoglobin, a globular protein, is highly likely to Be localized within the interior of the molecule?
a) Arginine
b) Valine
c) Aspartic acid
d) Lysine

Q.40 Two sugars found in nucleic acids are
A. sucrose and ribose.
B. glucose and fructose.
C. deoxyribose and ribose.
D. deoxyribose and glucose.

Q.41 Vitamin K is indicated for the treatment of bleeding occurring in patients
(a) Being treated with heparin
(b) Being treated with streptokinase
(c) Of obstructive jaundice
(d) Of peptic ulcer

Q.42. Menadione (Vitamin K3)
(a) Can cause hemolysis in patients with G-6-PD deficiency
(b) Is given in large doses in patients with severe liver disease
(c) is useful to prevent haemorrhagic disease of the newborn
(d) Is the preparation of choice to antagonize the effect of warfarin overdose.

Q.43 Vitamin K promotes the hepatic biosynthesis of following blood clotting factor
(a) Factor I
(b) Factor II
(c) Factor VIII
(d) All of the above

Q.44 folinic acid is principally used
(a) In pernicious anaemia
(b) In megaloblastic anaemia secondary to Vitamin B12
(c) Along with methotrexate therapy
(d) In treatment of folic acid deficiency

Q.45 Penicillamine
(a) Is effective orally
(b) Can cause anaphylactic reactions in patients allergic to penicillin
(c) Is safe in pregnancy
(d) Is not effective in lead poisoning

46. Dicoumarol is antagonist to
(A) Riboflavin
(B) Retinol
(C) Menadione
(D) Tocopherol

47. In the individuals who are given liberal quantities of vitamin C, the serum ascorbic acid level is
(A) 1–1.4 μg/100 ml
(B) 2–4 μg/100 ml
(C) 1–10 μg/100 ml
(D) 10–20 μg/100 ml

48. The vitamin which would most likely become deficient in an individual who develop a completely carnivorous life style is
(A) Thiamin
(B) Niacin
(C) Vitamin C
(D) Cobalamin

49. In human body highest concentration of ascorbic acid is found in
(A) Liver
(B) Adrenal cortex
(C) Adrenal medulla
(D) Spleen

50. The vitamin required for the formation of Hydroxyproline (in collagen) is
(A) Vitamin C
(B) Vitamin A
(C) Vitamin D
(D) Vitamin E

Answers

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