Chemistry MCQs
Chemistry MCQs
00. Serum lipase is increased in
(A) Acute parotitis
(B) Acute pancreatitis
(C) Infective hepatitis
(D) Biliary obstruction
01. Which one of the following metabolites is not directly
produced in the hexose monophosphate pathway?
(A) Fructose-6-phosphate
(B) Dihydroxy acetone phosphate
(C) CO2
(D) Erythrose-4-phosphate
02. Which one of the following statements concerning
glucose-6-phosphate dehydrogenase deficiency is correct?
(A) Young R.B.Cs, particularly reticulocytes, contain the
highest enzyme activity cells show less enzyme activity
(B) Glucose-6-P Dehydroglucose deficiency leads to
disfuction of many tissues
(C) G-6-p Dehydroglucose deficiency is due to a single
deletion of a large sequence of DNA in the G-6-PD gene
(D) G-6-PD deficiency is precipitated by ingestion of drugs
such as aspirin
03. The phenomenon of inhibition of glycolysis by O2 is
termed as
(A) Red drop
(B) Pasteur effect
(C) Michaelis effect
(D) Fischer’s effect
04. Seratonin is derived in the body from the following
amino acid:
(A) Phenylalanine
(B) Histidine
(C) Tryptophan
(D) Serine
05. Which amino acid is a lipotropic factor?
(A) Lysine
(B) Leucine
(C) Tryptophan
(D) Methionine
06. Which among the following is a nutritionally essential
amino acid for man ?
(A) Alanine
(B) Glycine
(C) Tyrosine
(D) Tryptophan
07. The essential amino acids
(A) Must be supplied in the diet because the organism has
lost the capacity to aminate the corresponding ketoacids
(B) Must be supplied in the diet because the human has an
impaired ability to synthesize the carbon chain of the corresponding ketoacids
(C) Are identical in all species studied
(D) Are defined as
those amino acids which cannot be synthesized by the organism at a rate
adequate to meet metabolic requirements
08. Which among the following is an essential amino acid?
(A) Cysteine
(B) Leucine
(C) Tyrosine
(D) Aspartic acid
09. Which among the following is a basic amino acid?
(A) Aspargine
(B) Arginine
(C) Proline
(D) Alanine
10. This amino acid cannot have optical isomers:
(A) Alanine
(B) Histidine
(C) Threonine
(D) Glycine
11. The amino acid which contains a guanidine group is
(A) Histidine
(B) Arginine
(C) Citrulline
(D) Ornithine
12. GABA(gama amino butyric acid) is
(A) Post-synaptic excitatory transmitter
(B) Post-synaptic inhibitor transmitter
(C) activator of glia-cell function
(D) inhibitor of glia-cell function
13. Sulphur-containing amino acid is
(A) Glutathione
(B) Chondroitin sulphate
(C) Homocysteine
(D) Tryptophan
14. The useful reagent for detection of amino acids is
(A) Molisch reagent
(B) Dichlorophenol Indophenol
(C) Ninhydrin
(D) Biuret
15. The amino acid which contains an indole group is
(A) Histidine
(B) Arginine
(C) Glycine
(D) Tryptophan
16. Sakaguchi reaction is answered by
(A) Lysine
(B) Ornithine
(C) Arginine
(D) Arginino succinic acid
17. The pH of an amino acid depends
(A) Optical rotation
(B) Dissociation constant
(C) Diffusion coefficient
(D) Chain length
18. When amino acids are treated with neutral formaldehyde,
the pH of the mixture
(A) Is not altered
(B) Increases
(C) Decreases
(D) First increases then decreases
19. Which among the following has an imidazole group?
(A) Histidine
(B) Tryptophan
(C) Proline
(D) Hydroxy proline
20. The amino acid
exist as Zwitter ions when they are in
(A) solid state
(B) acidic solution
(C) alkaline solution
(D) neutral solution
21. Plasma proteins are isolated by
(A) Salting out
(B) Electrophoresis
(C) Flourimetry
(D) Both (A) and (B)
22. After digestion amino acids
(A) Are absorbed into portal circulation
(B) Are absorbed into lymph
(C) Are excreted to the extent of 50%
(D) Converted into glucose in the intestine
23. Cysteine has the formula:
(A) CH3SH
(B) H2N—CH2—COOH
(C) HS—CH2—CH(NH2)—COOH
(D) S—CH2—CH(NH2)—COOH | S—CH2—CH(NH2)—COOH
24. The compound having the formula
H2N—CO—NH—CH2—CH2—CH2—CH— COOH is | NH2
(A) Lysine
(B) Glutamine
(C) Serine
(D) Citrulline
25. An amino acid which contains a disulphide bond is
(A) Lysine
(B) Methionine
(C) Homocysteine
(D) Cystine
26. One of the following has a phenolic group:
(A) Histidine
(B) Hydroxy lysine
(C) Seratonine
(D) Hydroxy proline
27. An amino acid not containing the usual— COOH group is
(A) Alanine
(B) Tryptophan
(C) Methionine
(D) Taurine
28. Branched chain amino acids are
(A) Cysteine and cystine
(B) Tyrosine and Tryptophan
(C) Glycine and Serine
(D) Valine, Leucine and Isoleucine
29. A Zwitter ion is one which has in aqueous solution:
(A) One positive
charge and one negative charge
(B) Two positive charges and one negative charge
(C) Two negative charges and one positive charge
(D) No electrical charges at all
30. The amino acid which gives yellow colour with Ninhydrin
in paper chromatography is
(A) Tyrosine
(B) Proline
(C) Tryptophan
(D) Alanine
31. Hydroxylation of Proline and Lysine in a protein is
effected by
(A) Vitamin B1
(B) Vitamin B2
(C) Vitamin B6
(D) Vitamin C
32. Millon’s test is for identification of
(A) Tyrosine
(B) Tryptophan
(C) Proline
(D) Arginine
33. Hopkins-Cole test is for identification of
(A) Tyrosine
(B) Tryptophan
(C) Arginine
(D) Cysteine
34. Collagen is very rich in
(A) Glycine
(B) Serine
(C) Aspartic acid
(D) Glutamic acid
35. All amino acids are optically active except
(A) Glycine
(B) Serine
(C) Threonine
(D) Tryptophan
36. Out of 200 different amino acids form in nature the
number of amino acids present in protein:
(A) 20
(B) 25
(C) 40
(D) 35
37. Enzyme catalyzed hydrolysis of proteins produces amino
acids of the form:
(A) D
(B) L
(C) DL
(D) All of these
38. The ionizable groups of amino acids are at least.
(A) 1
(B) 2
(C) 3
(D) 4
39. The neutral amino acid is
(A) Lysine
(B) Proline
(C) Leucine
(D) Histidine
40. The amino acid containing hydroxyl group:
(A) Alanine
(B) Isoleucine
(C) Arginine
(D) Threonine
41. The sulphur containing amino acid:
(A) Homoserine
(B) Serine
(C) Methionine
(D) Valine
42. The basic amino acid:
(A) Glycine
(B) Leucine
(C) Histidine
(D) Proline
43. The amino acid which synthesizes many hormones:
(A) Valine
(B) Phenyl alanine
(C) Alanine
(D) Histidine
44. Amino acids are insoluble in
(A) Acetic acid
(B) Chloroform
(C) Ethanol
(D) Benzene
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