Chemistry chapter 19 Entry Test MCQs
26. Hydrolysis of sucrose is called
a. Inversion
b. Esterification
c. Hydration
d. Saponification
27. Sugars are
a. Polyhydroxy aldehydes or ketones which may or may not be optically active
b. Optically active polyhydroxy aldehydes
c. Optically active polyhydroxy ketones
d. Optically active polyhydroxy aldehydes or ketones
28. A carbohydrate consists of
a. C, H, N and O
b. C and O
c. C and H
d. C, H and O
29. Starch can be used as an indicator for the detection of traces of
a. Protein in blood
b. Glucose in aqueous solution
c. Urea in blood
d. Iodine in aqueous solution
30. Which one of the following compounds is found abundantly in nature?
a. Glucose
b. Fructose
c. Cellulose
d. Starch
31. Glucose cannot be classified as
a. An oligosaccharide
b. A hexose
c. An aldose
d. A carbohydrate
Lipids
32. Which of the following is not a fatty acid:
a. Stearic acid
b. Formic acid
c. phenyl acetic acid
d. Palmitic acid
33. This molecule acts as molecular chaperones to assist the folding of proteins
a. Amides
b. Vitamins
c. Lipids
d. Carbohydrates
34. Rancidity of lipids of lipid-rich foodstuff is because of
a. Hydrogenation of unsaturated fatty acids
b. Reduction of fatty acids
c. Oxidation of fatty acids
d. Dehydrogenation of saturated fatty acids
35. This is an example of derived lipids
a. Carotenoids
b. Terpenes
c. Steroids
d. All of the above
36. The degree of unsaturation of lipids can be measured as
a. Reichert Meissel no.
b. Iodine number
c. Polenske number
d. Saponification no.
37. The specific gravity of lipid is
a. 0.8
b. 1.5
c. 1.2
d. 1.0
Proteins
38. Which of the following biomolecules contain non-transition metal ion
a. Haemoglobin
b. Vitamin B12
c. Insulin
d. Chlorophyll
39. Amide group is present in
a. Amino acids
b. Lipids
c. Proteins
d. Carbohydrates
40. Irreversible precipitation of proteins is called
a. Rearrangement
b. Denaturation
c. Electrophoresis
d. Hydrolysis
41. The proteins with a prosthetic group are called
a. Conjugated proteins
b. Pseudo proteins
c. Polypeptides
d. Complex proteins
42. Amino acids are
a. Volatile solids
b. Liquids
c. Mixture of amines and acids
d. Non-volatile crystalline compounds
43. The main structural feature of proteins is
a. The peptide linkage
b. The ester linkage
c. All co-exist
d. The ether linkage
44. The helical structure of proteins is established by
a. hydrogen bond
b. Peptide bonds
c. Vander Waal’s forces
d. Dipeptide bond
45. Protein contains
a. Cl, H and O
b. C, H, O and N
c. C, H and O
d. Only C and H
46. The molecular weight of protein is
a. > 1000
b. < 10000
c. > 1000 and < 10000
d. > 10000
47. The protein that is a structural material is
a. Haemoglobin
b. Albumin
c. Keratin
d. Oxytocin
48. Secondary structure of a protein refers to
a. Linear sequence of amino acid residues in the polypeptide chain
b. Mainly denatured proteins and structures of prosthetic groups
c. Regular folding patterns of continuous portions of the polypeptide chain
d. Three dimensional structure, specially the bond between amino acid residues that are distant from each other in the polypeptide chain
49. The correct statement in respect of protein haemoglobin is that it
a. Forms antibodies and offers resistance to diseases
b. Acts as an oxygen carrier in the blood
c. Maintains blood sugar level
d. Functions as a catalyst for biological reactions
Enzymes
50. Which of the following is produced with the combination of apoenzyme and coenzyme:
a. Enzyme substrate complex
b. Holoenzyme
c. Enzyme product complex
d. Prosthetic group