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Quiz 16
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Q.1
Which among the following is an essential fatty acid in mammals?
0%
a) Stearic acid.
0%
b) Palmitic acid
0%
c) Acetic acid
0%
d) Gamma Linoleic acid
Explanation
Answer:(d)
Q.2
The loss of tertiary and quaternary structure of an enzyme brings out:
0%
a) Loss of its catalytic activity.
0%
b) Thermo stability.
0%
c) Increase in water solubility.
0%
d) Loss in lipid solubility.
Explanation
Answer:(a)
Q.3
If one amino acid in each beta chain of haemoglobin, out of 574 amino acids do not occupy normal place it can lead to
0%
a) paralysis
0%
b) death
0%
c) cramp
0%
d) fits
Explanation
Answer:(b)
Q.4
A polymer that is formed by glycosidic linkage of many monosaccharide units is called as
0%
a) Monosaccharides
0%
b) Polymer
0%
c) Polysaccharides
0%
d) Disaccharides
Explanation
Answer:(c)
Q.5
The vitamin Niacin functions as coenzyme in
0%
a) Nucleoprotein synthesis
0%
b) Hydrogen transport
0%
c) Fatty acid synthesis
0%
d) RBC production
Explanation
Answer:(b)
Q.6
Which of the following is a purine nucleoside?
0%
a) Uracil
0%
b) Cytidine
0%
c) Thymidine
0%
d) Adenosine
Explanation
Answer:(d)
Q.7
In the average composition of a cell, the maximum % of total cellular mass [after water and protein] is constituted by
0%
a) Carbohydrates
0%
b) Lipid
0%
c) Nucleic acids
0%
d) Ions
Explanation
Answer:(c)
Q.8
Jute fibres deteriorate quickly because
0%
a) cellulose content is high
0%
b) lignin content is high
0%
c) cellulose content is low
0%
d) lignin content is low
Explanation
Answer:(b)
Q.9
Nitrogen bases do not contain:
0%
a) Carbon.
0%
b) Phosphorus
0%
c) Hydrogen
0%
d) Nitrogen
Explanation
Answer:(b)
Q.10
The number of monosaccharide units in a polysaccharide is
0%
a) 4
0%
b) 6
0%
c) 10
0%
d) More than 10
Explanation
Answer:(d)
Q.11
A specific low molecular weight substance such as the product of another enzyme in the chain reaction which binds with a specific site of the enzyme different from its substrate binding site is called as
0%
a) Irreversible inhibitor
0%
b) Competitive inhibitor
0%
c) Allosteric modulator
0%
d) Non-competitive inhibitor
Explanation
Answer:(c)
Q.12
statement best describes the information shown in the graph below:
0%
a) The action of enzymes varies with pH.
0%
b) A pH of 7 provides an optimum medium for digestive enzymes.
0%
c) Gastric juices is active at a pH ranging from 0 to 14.
0%
d) Acids have a pH greater than 7.
Explanation
Answer:(a)
Q.13
Find out the number of trioses, tetroses, pentoses, hexoses and heptoses from the following monosaccharides: Glyceraldehyde, Dihydroxy acetone, Erythrose, Erythrulose, Ribose, Ribulose, Xylulose, Arabinose, Deoxyribose, Glucose, Fructose, Galactose, Mannose, Rhamnose, Sedoheptose.
0%
a) Trioses= 1; Tetroses= 3; Pentoses= 6; Hexoses= 3; Heptoses= 2
0%
b) Trioses= 3; Tetroses= 2; Pentoses= 4; Hexoses= 5; Heptoses= 1
0%
c) Trioses= 2; Tetroses= 2; Pentoses= 5; Hexoses= 5; Heptoses= 1
0%
d) Trioses= 5; Tetroses= 2; Pentoses= 1; Hexoses= 2; Heptoses= 5
Explanation
Answer:(c)
Q.14
Which statement is true?
0%
a) Adenine has 4 nitrogen atoms
0%
b) Cytosine has 3 nitrogen atoms
0%
c) Guanosine has 3 nitrogen atoms
0%
d) Uracil has 5 nitrogen atoms
Explanation
Answer:(b)
Q.15
Glucose is
0%
a) Ketose hexose sugar
0%
b) Aldose hexose sugar
0%
c) Furanose pentose sugar
0%
d) Pyranose pentose sugar
Explanation
Answer:(b)
Q.16
Most of the blood proteins in our body are
0%
a) Acidic
0%
b) Basic
0%
c) Neutral
0%
d) None of there
Explanation
Answer:(a)
Q.17
In the DNA molecule
0%
a) the total amount of purine nucleotides anad pyrimidine nucleotides is not always equal
0%
b) there are two strands which run parallel in the 5’ → 3’ direction
0%
c) the proportion of adenine in relation to thymine varies with the organism
0%
d) there are two strands which run antiparallel one 5’ → 3’ direction and other in 3’ → 5’
Explanation
Answer:(d)
Q.18
What is the term used for a protein molecule that assists in the proper folding of other proteins?
0%
a) ubiquitin
0%
b) chaperonin
0%
c) vimentins
0%
d) cyclins
Explanation
Answer:(b)
Q.19
Heating may cause denaturation of enzyme or protein mainly by damaging its
0%
a) physical configuration
0%
b) chemical structure
0%
c) both physical configuration as well as chemical structure
0%
d) other properties
Explanation
Answer:(b)
Q.20
Match column – I with Column – II and select the correct option from codes given below
Column – I
Column – II
A. Pigments
(i) Abrin, ricin
B. Toxins
(ii) Concanavalin A
C. Alkaloids
(iii) Carotenoids
D. Lectins
(iv) Morphine, codeine
0%
a) A = (iv) ; B = (iii) ; C = (i) ; D = (ii)
0%
b) A = (ii) ; B = (iv) ; C = (i) ; D = (iii)
0%
c) A = (iii) ; B = (i) ; C = (iv) ; D = (ii)
0%
d) A = (i) ; B = (ii) ; C = (iii) ; D = (iv)
Explanation
Answer:(c)
Q.21
How many ester bonds are present in a simple triglyceride?
0%
a) One
0%
b) Two
0%
c) Three
0%
d) Four
Explanation
Answer:(c)
Q.22
A compound which is responsible for structure of membranes of cell and its organelles is a
0%
a) lipid
0%
b) proteins
0%
c) fats, glucose, starch
0%
d) waxes
Explanation
Answer:(a)
Q.23
Identify X and Y in the newly synthesised polypeptide chain given below:
0%
a) X = – NH3, Y = – COOR.
0%
b) X = – NH2, Y = – COOH.
0%
c) X = – COOH, Y – NH2.
0%
d) X = – COOR, Y – NH2
Explanation
Answer:(b)
Q.24
The unique properties of each amino acid are determined by its particular
0%
a) R group
0%
b) Amino group
0%
c) Kinds of peptide bonds
0%
d) Number of bonds to other amino acids
Explanation
Answer:(a)
Q.25
If Oligosaccharides is hydrolyzed, it will yield up to two to ten
0%
a) monosaccharides
0%
b) disaccharides
0%
c) oligosaccharides
0%
d) polysaccharides
Explanation
Answer:(a)
Q.26
What type of bond is indicated by X in the diagram given below?
0%
a) Phosphodiester bond.
0%
b) Ionic bond.
0%
c) Glycosidic bond.
0%
d) Ester bond.
Explanation
Answer:(d)
Q.27
Inhibitors blocking active site by making covalent bonds are specifically known as
0%
a) reversible inhibitors
0%
b) irreversible inhibitor
0%
c) competitive inhibitors
0%
d) non-competitive inhibitors
Explanation
Answer:(b)
Q.28
Amylose is formed by condensation between
0%
a) α-glucose molecules
0%
b) β-fructose molecules
0%
c) between α-glucose and β-fructose molecules
0%
d) None of above
Explanation
Answer:(a)
Q.29
The enzyme code of enzyme 2.7.1.1 refers to the following main groups:
0%
a) Ligase.
0%
b) Hydrolase.
0%
c) Transferase.
0%
d) Lyase.
Explanation
Answer:(c)
Q.30
β - pleated structure of protein is present in silk fibres, the protein is
0%
a) Collagen
0%
b) Keratin
0%
c) Rayon
0%
d) Fibroin
Explanation
Answer:(d)
Q.31
Antiparallel strands of a DNA molecule means that
0%
a) the phosphate group of two DNA strands, at their endsm share the same position
0%
b) the phosphate groups at the start of two DNA strands are in opposite position (pole)
0%
c) one strand turns clockwise
0%
d) one strand turns anti-clockwise
Explanation
The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in opposite position (pole) A single DNA strand has two ends – one end has 5’-OH group – which is where a free phosphate group is attached to deoxyribose sugar. At the other end there is a 3’-OH group which is where a free hydroxyl group is attached to a deoxyribose sugar. The DNA chains are so arranged that you can never have two 5’ (five prime) or 3’ (three prime) at one end. This arrangement is called antiparallel, the strands run in opposite directions to each other. Answer:(b)
Q.32
Locomotion is a very important feature in animals. Considering the frequent need for locomotion in animals, an animal would obtain the greatest benefit from storing its energy as
0%
a) Fats
0%
b) Proteins
0%
c) Minerals
0%
d) Carbohydrates
Explanation
Answer:(a)
Q.33
Match the tissues/ molecules mentioned in column I with those of their degrading enzymes mentioned in column II and select the correct option from the given codes
Column I
Column II
A. Cell wall
(i) Proteases
B. RNA
(ii) Pectinases
C. Histone
(iii) Ribonucleases
D. Pectin
(iv) Cellulase
0%
a) A = (iv); B = (iii) ; C – (i); D – (ii)
0%
b) A = (ii); B = (i) ; C – (iv); D – (iii)
0%
c) A = (i); B = (ii) ; C – (iii); D – (iv)
0%
d) A = (iii); B = (iv) ; C – (ii); D – (i)
Explanation
Answer:(a)
Q.34
The inorganic compounds like phosphate, sulphate, etc which becomes available in the filtrate after grinding the living tissue in trichloroacetic acid represents:
0%
a) Acid – insoluble pool.
0%
b) Acid – soluble pool.
0%
c) Water – pool.
0%
d) Gaseous pool.
Explanation
Answer:(b)
Q.35
Both in cells and extracellular fluids dibasic phosphate (HPO4-) and monobasic phosphate (H2PO4-) act as acid base buffers to maintain-
0%
a) K+ concentration of extracellular fluid
0%
b) Na+ concentration of extracellular fluid
0%
c) Na+ concentration of cellular fluid
0%
d) H+ concentration of cellular fluid
Explanation
Answer:(d)
Q.36
Which of the following is phospholipids?
0%
a) Oleic acid
0%
b) Sphingomyelin
0%
c) Prostaglandin
0%
d) Glycerol
Explanation
Answer:(b)
Q.37
Match the following:
Column I
Column II
Class 1
I. Ligases
Class 2
II. Isomerases
Class 3
III. Lyases
Class 4
IV. Hydrolases
Class 5
V. Transferases
Class 6
VI. Oxido-reductase or dehydrogenase or redox enzyme.
0%
a) 1 – I, 2 – II, 3 – III, 4 – IV, 5 – V, 6 – VI.
0%
b) 1 – I, 2 – III, 3 – V, 4 – II, 5 – IV, 6 – VI.
0%
c) 1 – VI, 2 – V, 3 – IV, 4 – III, 5 – II, 6 – I.
0%
d) 1 – II, 2 – IV, 3 – VI, 4 – I, 5 – III, 6 – V.
Explanation
Answer:(c)
Q.38
The feedback effect in enzymatic action refers to
0%
a) The effect of enzyme concentration on its rate of action
0%
b) The effect of substrate on the rate of enzyme action
0%
c) The effect of an external compound on the rate of enzymatic action
0%
d) The effect of end products on the rate of enzymatic action
Explanation
Answer:(d)
Q.39
Which of the following is incorrect?
0%
a) Nitrogenous base :Adenine Nucleoside :Adenosine Nucleotide:Adenylic acid
0%
b) Nitrogenous base :Uracil Nucleoside :Uridine Nucleotide:Uridylic acid.
0%
c) Nitrogenous base :Thymine Nucleoside :Thymosine Nucleotide:Thymonylic acid
0%
d) Nitrogenous base :Cytosine Nucleoside :Cytidine Nucleotide: Cytidylic acid
Explanation
Answer:(c)
Q.40
In amylose chain, glucose molecules are linked through
0%
a) 1 → 3 bond
0%
b) 1 → 4 bond
0%
c) 2 → 2 bond
0%
d) 2 → 4 bond
Explanation
Answer:(b)
Q.41
Analyse the figure given below. The Km values for the curves of four different enzymes and their substrates (P, Q, R and S) are 1.72, 0.25, 3.40 and 5.75 respectively. Select the correct order about their enzyme – substrate affinity?
0%
a) P > Q > R > S.
0%
b) Q > P > R > S.
0%
c) R > P > Q > S.
0%
d) S > R > Q > P.
Explanation
Answer:(b)
Q.42
Which one of the following correct average composition of cells with respect to the percentage of total cellular mass?
H2O
Proteins
Carbohydrates
lipid
Nucleic acids
Ions
(A)
70 – 90
10 – 15
3
2
5 – 7
1
(B)
70 – 90
3
10 – 15
2
5 – 7
1
(C)
70 – 90
10 – 15
2
3
1
5 – 7
(D)
70 – 90
3
10 – 15
2
5 – 7
1
0%
a) A
0%
b) B
0%
c) C
0%
d) D
Explanation
Answer:(a)
Q.43
Vitamin nicotinamide and the plant hormone indole-3-acetic acid are formed from
0%
a) Alanine
0%
b) Serine
0%
c) Tryptophan
0%
d) Glutamic acid
Explanation
Answer:(c)
Q.44
Which one of the following is saturated fatty acid?
0%
a) Linolenic acid
0%
b) Oleic acid
0%
c) Stearic acid
0%
d) Linoleic acid.
Explanation
Answer:(c)
Q.45
Chitin is the second most abundant organic substance present in the exoskeleton of insects and crustaceans. It is a
0%
a) Lipid
0%
b) Protein and CaCO3 deposits in it
0%
c) Polysaccharide and the basis unit is N-acetyl glucosamine
0%
d) Protein
Explanation
Answer:(c)
Q.46
An amino has the following structure. Which two groups combine to form the peptide linkage?
0%
a) 1 – 3.
0%
b) 2 – 3.
0%
c) 1 – 4.
0%
d) 1 – 2.
Explanation
Answer:(a)
Q.47
Consider the following flow chart where A represents Filtrate/Acid soluble pool and B represents Retentate/Acid insoluble fraction pellet: (i) Molecular weight ranging from 18 to 800daltons (Da) approximately. (ii) Has four types of organic compounds – proteins, nucleic acids, polysaccharides and lipids. (iii) Contains chemicals that have molecular weight more than 10,000Da. (iv) Has monomers. (v) Has generally polymers. (vi) Represent rough chemical composition of cytosol. (vii) Represent the framework of cytoplasm and cell organelles. Which of the following is the correct statement (i) –(vii) for A and B?
0%
a) A – (i), (ii) and (iii); B – (iv), (v), (vi) and (vii).
0%
b) A – (ii), (iv) and (vi); B – (i), (iii), (v) and (vii).
0%
c) A – (i), (iv) and (vi); B – (ii), (iii), (v) and (vii).
0%
d) A – (i), (iii) and (v); B – (ii), (iv), (vi) and (vii).
Explanation
Answer:(c)
Q.48
Find the basic amino acids?
0%
a) Glutamic acid and aspartic acid
0%
b) Histidine and proline
0%
c) Lysine and arginine
0%
d) Glycine and alanine
Explanation
Answer:(c)
Q.49
Which of the following is used to ice creams, cosmetics and medicines to emulsify and give a smooth texture?
0%
a) Carboxy methylcellulose
0%
b) Cellulose nitrate
0%
c) Cellulose acetate
0%
d) Cellulose
Explanation
Answer:(a)
Q.50
In non-competitive inhibition
0%
a) the substrate and inhibitor cannot bind to the enzyme at the same time
0%
b) the inhibitor binds only to the substrate-enzyme complex
0%
c) the inhibitor can bind to the enzyme at the same time as the enzyme’s substrate
0%
d) the binding of the inhibitor to the enzyme reduces it activity but does not affect the binding of substrate
Explanation
Answer:(d)
0 h : 0 m : 1 s
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