Chapter 14 Biomolecules MCQs
Q 81.: Which one of the following has maximum laevorotatory nature ?
(A) D-Fructose
(B) D-Glucose
(C) Sucrose
(D) Invert sugar
Option – A
Q 82.: Cellulose is soluble in :
(A) Ammoniacal cupric hydroxide solution
(B) Water
(C) Organic solvent
(D) None of the above
Option – A
Q 83.: Which of the following does not form an oxime ?
(A) Glucose
(B) Arabinose
(C) Glucose pentaacetate
(D) Galactose
Option – C
Q 84.: Identity the pair of acidic, basic and neutral amino acids respectively
(A) Asparagine, Glycine and Valine
(B) Asparagine, Lysine and Histidine
(C) Asparagine, Lysine and Glycine
(D) Asparagine, Histidine and Arginine
Option – C
Q 85.: What is not true about essential amino acids ?
(A) All basic amino acids are essential
(B) They are 10 in number
(C) They cannot synthesis by body
(D) All acidic amino acids are essential
Option – D
Q 86.: Select the False statement about amino acids
(A) Colourless and non-volatile solids
(B) Soluble in non-polar solvent
(C) They exist as internal salt or zwitterion
(D) At certain pH they do not migrate under influence of electric field
Option – B
Q 87.: What is not true about isoelectric point or isoelectric pH ?
(A) Slightly less than pH 7 for neutral amino acids
(B) Slightly greater than pH 7 for neutral amino acids
(C) It lies between pH 3.0 – 5.5 for acidic amino acids
(D) It lies between pH 7.6 – 10.5 for basic amino acids
Option – B
Q 88.: Effect on solubility of amino acids at isoelectric point
(A) Solubility decreases
(B) Solubility increases
(C) Remain unaffected
(D) Show irregular behaviour
Option – A
Q 89.: In a protein molecule various amino acids are linked together by
(A) Dative bond
(B) Glycosidic bond
(C) Peptide bond
(D) Phosphoester bond
Option – C
Q 90.: Sanger’s reagent is used for the identification of ….
(A) C-terminal of peptide chain
(B) N-terminal of peptide chain
(C) Side chain of Amino acids
(D) Denaturation of peptide chain
Option – B
Q 91.: Which of the following is a conjugated protein ?
(A) Glycoprotein
(B) Chromoprotein
(C) Phosphoprotein
(D) All of these
Option – D
Q 92.: Biuret test is not given by ___________
(A) Protein
(B) Amino acids
(C) Carbohydrates
(D) Urea
Option – C
Q 93.: Select the incorrect statement, among the following
(A) Haemoglobin is soluble in water
(B) Collagen is soluble in water
(C) Fibrinogen is soluble in water
(D) Albumin is soluble in water
Option – B
Q 94.: The number of disulphide linkages present in insulin are ____
(A) One
(B) Two
(C) Three
(D) Four
Option – C
Q 95.: A protein on hydrolysis give α-amino acids along with small non-protein part is called ____
(A) Conjugate protein
(B) Derived protein
(C) Simple protein
(D) Incomplete protein
Option – A
Q 96.: Normal Haemoglobin can change in sickle-cell Haemoglobin due to replacement at 6th position when _______
(A) Valine replace Glutamic acid
(B) Glutamic acid replace Valine
(C) Valine replace Aspartic acid
(D) Aspartic acid replace Valine
Option – A
Q 97.: Which of the following statement is correct ?
(A) All amino acids are optically active
(B) All amino acids except glycine are optically active
(C) All amino acids except glutamic acid are optically active
(D) All amino acids except Lysine are optically active
Option – B
Q 98.: Secondary structure of proteins refers to __________
(A) Regular folding patterns of continuous portions of the polypeptide chain
(B) Polypeptide chains lie side by side in zig-zag manner in same or opposite direction
(C) Polypeptide chains coil up into a spiral structure
(D) All of these
Option – D
Q 99.: Select the Incorrect statement, among the following
(A) Native protein is biologically active and has a unique 3D structure
(B) Denaturated proteins is biologically inactive
(C) Denaturated proteins are soluble in water
(D) Denaturation of protein may or may not be reversible
Option – C
Q 100.: Select the function is not performed by proteins
(A) They play important role in immunity
(B) They act as chemical messengers and receptors and help in cell signaling
(C) They act as transport agents as well as can catalyse biochemical reactions
(D) They are major source of energy.
Option – D
Q 101.: The boiled egg albumin turns into white semisolid mass, is an example of
(A) Renaturation of egg albumin
(B) Denaturation of egg albumin
(C) Both 1 and 2
(D) None of these
Option – B
Q 102.: Select the best match
(A) Fiberous protein : Keratin in skin, Collagen in bones, Myosin in muscles
(B) Globular protein : Immunoglobulin in blood, Fibrinogen in blood, Fibroin in silk
(C) Complete protein : Milk, Egg, Meat, Rice and Wheat
(D) Incomplete protein : Maize, Pulses, Meat and Beans
Option – A
Q 103.: Ninhydrin test is used to detect
(A) Urea
(B) Glucose
(C) Amino acids
(D) Nucleotide
Option – C
Q 104.: Phenylketonuria disease is related to decreased metabolism of
(A) Urea
(B) Phenylalanine
(C) Dihydroxyacetone
(D) Glyceraldehyde
Option – B
Q 105.: Peptide bonds are _______
(A) Polyamine linkage
(B) Polyamide linkage
(C) Polyester linkage
(D) All of these
Option – B
Q 106.: The helical structure of protein is stabilized by ________
(A) Dipeptide bond
(B) Ether bond
(C) Peptide bond
(D) Hydrogen bond
Option – D
Q 107.: Subunits present in haemoglobin are
(A) Four
(B) Five
(C) Three
(D) Six
Option – A
Q 108.: Select the incorrect statement, among the following
(A) Level of glucose above 60mg/100ml of blood is called hypoglacemia
(B) Level of glucose below 60mg/100ml of blood is called hyperglacemia
(C) Both 1 and 2
(D) None of these
Option – C
Q 109.: Interferon is :
(A) Protein released by damaged tissue
(B) Protein responsible for blood coagulation
(C) Protein drive from the body against viruses or cancer
(D) A trade name of a potential insecticide
Option – C
Q 110.: Which one of the following statements is incorrect about enzyme catalyst ?
(A) Enzymes are mostly protein as in nature
(B) Enzyme action is specific
(C) Enzymes are denatured by ultraviolet rays and at high temperature
(D) Enzymes are least reactive at optimum temperature
Option – D
Q 111.: In an alkaline medium, glycine predominantly exist as :
(A) Cation
(B) Anion
(C) Zwitter ion
(D) Neutral
Option – B
Q 112.: Denaturation of proteins leads to loss of its biological activity by ______
(A) Formation of amino acids
(B) Loss of primary structure
(C) Loss of both primary and secondary structures
(D) Loss of both secondary and tertiary structures
Option – D
Q 113.: The structural feature that distinguishes proline from other amino acids are
(A) It is a secondary amine
(B) It contains an anhydride group
(C) It is a tertiary a mine
(D) It exists as cyclic amides
Option – A
Q 114.: Proteins when heated with conc. nitric acid, give a yellow colour. This is :
(A) Xanthoprotic test
(B) Oxidising test
(C) Hoppe’s test
(D) Acid-base test
Option – A
Q 115.: Functionality of protein depends on
(A) Its shape and structure
(B) pH of medium
(C) Temperature
(D) All of the above
Option – D
Q 116.: The compound which give a positive ninhydrin test and a negative Benedict’s solution test is
(A) A lipid
(B) A protein
(C) A monosaccharide
(D) A disaccharide
Option – B
Q 117.: The only amino acid which is non-chiral, is
(A) Lysine
(B) Proline
(C) Glycine
(D) Histidine
Option – C
Q 118.: Protein gives blue colour with :
(A) Ninhydrin
(B) Benedict reagent
(C) Iodine solution
(D) Biurete
Option – A
Q 119.: Lysine is least soluble in water in pH range :
(A) 3 – 4
(B) 5 – 6
(C) 6 – 7
(D) 8 – 9
Option – C
Q 120.: On treatment with ninhydrin which of the following give blue colour ?
(A) Protein
(B) Peptide
(C) Amino acids
(D) All of these
Option – D