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Quiz 8
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Q.1
Select the incorrect statement ... .... [ kerala 2011]
0%
a) Collagen is the most abundant protein in the whole of biosphere and RuBisCo is the most abundant protein in animal world
0%
b) Proteins are heteropolymers made of amino acids
0%
c) Ribozymes are nucleic acids with catalytic power
0%
d) Proteins, nucleic acids and polysaccharides are the only three types of macromolecules found in living system
Explanation
Answer : (a)
Q.2
One molecule of an enzyme is able to catalyse conversion of two molecules of substarte into products in 5 minutes. Ten molecules of enzyme and 25 molecules of substrate are mixed in a test tube. At the end of 10 minutes the test tube will have ... .... [ KCET 2002]
0%
a) Products only
0%
b) Products and 5 unreacted substrate molecules
0%
c) Products and enzyme molecules
0%
d) Products, enzyme molecules and 5 molecules of substrate
Explanation
Ten molecules of enzyme will convert 20 of substarte into products in 5 minutes Thus at the end on 10 mimutes only product and enzyme will be test tube Answer : (c)
Q.3
Which one is a simple protein ... ... [ W.B.2010]
0%
a) Albumin
0%
b) Nucleoprotein
0%
c) Lipoprotein
0%
d) Glycoprotein
Explanation
Simple proteins are made up of amino acid subunits joined together by peptide bonds. When hydrolyzed by enzymes, simple proteins yield only the amino acids from which they are comprised of simple proteins include albumins, globulins, glutelins and albuminoids Nucleoprotein a complex consisting of a nucleic acid bonded to a protein. Lipoproteins are macromolecular complexes of lipids and proteins Glycoproteins are proteins which contain oligosaccharide chains (glycans) covalently attached to amino acid side-chains. Answer : (a)
Q.4
Enzyme are different from catalyst in ... .... [ AFMC 1995]
0%
a) Being proteinaceous
0%
b) Not used up in reaction
0%
c) Functional at high temperature
0%
d) Having high rate of diffusion
Explanation
Answer : (a)
Q.5
Which one is wrongly matched? ... .... [ CBSE 2008]
0%
a) Guanine, adenine-Purines
0%
b) Thymine, uracil-Pyrimidine
0%
c) Uracil, cytosine - Pyrimidine
0%
d) Adenine, thymine - Purines
Explanation
The pyrimidine bases are thymine , cytosine and uracil adenine and thymine, are purine Answer : (d)
Q.6
Keratin is the major constituent of ... .... [ HPPMT 2001]
0%
a) Brain
0%
b) Hair and skin
0%
c) Blood
0%
d) Bones and teeth
Explanation
Keratin is one of a family of fibrous structural proteins known as scleroproteins. It is the key structural material making up hair, nails, feathers, horns, claws, hooves, calluses, and the outer layer of skin among vertebrates. Answer : (b)
Q.7
Part of enzyme which combines with non-protein part to form functional enzyme is ... .... [ AFMC 1997]
0%
a) Apoenzyme
0%
b) Coenzyme
0%
c) Prosthetic group
0%
d) None of the above
Explanation
Apoenzyme is the proteinaceous part of an enzyme. The apoenzyme plus non- protein aceous part is called holoenzyme. Co-enzyme is a non- protein compound that is necessary for the function of an enzyme.Prosthetic group is a non- protein group, forming a part of or combined with a protein. Answer : (a)
Q.8
ATP is ... ... [ AFMC 2007]
0%
a) Nucleotide
0%
b) Nucleoside
0%
c) Purine base
0%
d) Nucleosome
Explanation
ATP is a nucleotide consisting of an adenine base attached to a ribose sugar, which is attached to three phosphate groups. Answer : (a)
Q.9
Pick out lectin from those given below ... .. [ kerala 2010]
0%
a) Gum
0%
b) Diterpene
0%
c) Concanavilin
0%
d) Curcumin
Explanation
Answer : (c)
Q.10
An example of competitive inhibition of an enzyme is the inhibition of ... .... [ AIIMS 2003]
0%
a) Succinic dehydrogenase by malonic acid
0%
b) Cytochrome oxidase by cyanide
0%
c) Hexokinase by glucose 6-phosphate
0%
d) Carbonic anhydrase by carbon dioxide
Explanation
Malonate is a competitive inhibitor of the enzyme succinate dehydrogenase: malonate binds to the active site of the enzyme without reacting, and so competes with succinate, the usual substrate of the enzyme. Answer : (a)
Q.11
Polymer of sucrose is ... ...
0%
a) Cellulose
0%
b) Starch
0%
c) Glycogen
0%
d) Fluka Ficoll
Explanation
Answer : (d)
Q.12
Which of the following groups contains all polysaccharides ... .. [ DPMT 1997]
0%
a) Glycogen, sucrose and maltose
0%
b) Sucrose, glucose and fructose
0%
c) Maltose, lactose and fructose
0%
d) Glycogen, cellulose and starch
Explanation
Monosaccharides are glucose, galactose, ribose, and glyceraldehyde. Disaccharides are Sucrose, Lactose, Maltose Trisaccharide are Nigerotriose, Maltotriose, Melezitose, Maltotriulose, Raffinose, Kestose Polysaccharides are Starch,Cellulose, Glycogen Answer : (d)
Q.13
Telomerase is an enzyme which is .... ... [ CBSE 2005]
0%
a) Simple protein
0%
b) RNA
0%
c) Ribonucleoprotein
0%
d) Repetitive DNA
Explanation
Telomerase, also called terminal transferase, is a ribonucleoprotein that adds a species-dependent telomere repeat sequence to the 3' end of telomeres. Answer : (c)
Q.14
Which statement regarding enzyme inhibition is correct? ... .... [ CBSE 2005]
0%
a) Competitive inhibition occurs when a substrate competes with enzyme for binding to inhibitor protein
0%
b) Competitive inhibition occurs when the substrate and the inhibitor compete for active site on the enzyme
0%
c) Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate
0%
d) Non-competitive inhibitors often bind to the enzyme irreversibly
Explanation
When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor Answer : (b)
Q.15
Which is protein in nature? .... .... [ Har PMT 2005]
0%
a) Polyethylene
0%
b) Cellulose
0%
c) Terylene
0%
d) Silk and wool
Explanation
Protein fibres like wool and silk, even nylon have ─NH2 and ─COOH groups on either sides of polymer chain. Direct dyes can react with ─NH2 groups of fibre to form ionic bonds. Answer : (d)
Q.16
ATP was discovered by ... ... [ KCET 2004]
0%
a) Lipmann
0%
b) Lohmann
0%
c) Blackman
0%
d) Bowman
Explanation
ATP was first discovered by the German chemist Karl Lohmann Answer : (b)
Q.17
Cholera patients are provided with saline drips as ... ... [ CBSE 2000 ]
0%
a) NaCl is component of blood, maintains RBCs and helps dissolve proteins
0%
b) Na+ is required for water retention in body and selective transport across plasma membrane
0%
c) Cl' is essential component of blood plasma
0%
d) Cl helps form HCl in stomach
Explanation
Cholera is an infectious disease that causes severe watery diarrhea, which can lead to dehydration and even death if untreated Saline is also used in I.V. therapy, intravenously supplying extra water to rehydrate people or supplying the daily water and salt needs Answer : (b)
Q.18
Which one is correct base paring base pairing for DNA molecule? .... ..... [ Pb.PMT 1998]
0%
a) Cytosine - Uracil
0%
b) Thymine - Guanine
0%
c) Adenine - Thymine
0%
d) Thymine - Uracil
Explanation
The rules of base pairing (or nucleotide pairing) are: A with T: the purine adenine (A) always pairs with the pyrimidine thymine (T) C with G: the pyrimidine cytosine (C) always pairs with the purine guanine (G) Answer : (c)
Q.19
An essential fatty acid is ... ... [ AFMC 2009]
0%
a) Palmitic acid
0%
b) Arachidonic acid
0%
c) Stearic acid
0%
d) Arachidic acid
Explanation
ω-3 fatty acid: α-Linolenic acid ω-6 fatty acid: Linoleic acid ω-3 fatty acids: eicosapentaenoic acid , docosahexaenoic acid o ω-6 fatty acids: gamma-linolenic acid , dihomo-gamma-linolenic acid, arachidonic acid Answer : (b)
Q.20
Starches which have unbranched chains and are only soluble in hot water are
0%
a) amylose starches
0%
b) amylopectin starches
0%
c) glucose starch
0%
d) pectin starch
Explanation
Answer:(a)
Q.21
Starch is polymer of ... ... [ CPMT 2009]
0%
a) Glucose
0%
b) Fructose
0%
c) Maltose
0%
d) Sucrose
Explanation
Starch is a polymer of glucose, a polysaccharide comprising glucose monomers joined in α 1,4 linkages. The simplest form of starch is the linear polymer amylose; amylopectin is the branched form. Answer : (a)
Q.22
A linear polymeric biomolecule with reducing and non-reducing ends is .... .... [ AMU 2011]
0%
a) RNA
0%
b) DNA
0%
c) Amylose
0%
d) Protein
Explanation
With one anomeric carbon unable to convert to the open-chain form, only the free anomeric carbon is available to reduce another compound, and it is called the reducing end of the disaccharide. A nonreducing disaccharide is that which has both anomeric carbons tied up in the glycosidic bond. Amylose is a polysaccharide made of α-D-glucose units, bonded to each other through α(1→4) glycosidic bonds. It is one of the two components of starch, One end of the amylose has free OH group so it is known as reducing end while the OH group on the other end forms the glycosidic bond so it is known as the non-reducing end. Answer : (c)
Q.23
A dominant intracellular cation is ... ... [ RPMT 2000 ]
0%
a) Na+
0%
b) K+
0%
c) Ca2+
0%
d) Chlorine
Explanation
Potassium is the major intracellular cation. It helps establish the resting membrane potential in neurons and muscle fibers after membrane depolarization and action potentials. Answer : (b)
Q.24
Find out wrongly matched pair ... ...[ kerala 2010]
0%
a) Primary metabolite - Ribose
0%
b) Secondary metabolite - Anthocyanin
0%
c) Protein - Insulin
0%
d) Cellulose - Heteropolymer
Explanation
Cellulose is made of repeat units of the monomer glucose. Cellulose is built out of a sugar monomer, it is called a polysaccharide. Answer : (d)
Q.25
Substance forming 80% of cytoplasm in plant cells is .... .... { AFMC 2000 ]
0%
a) Proteins
0%
b) Water
0%
c) Fast
0%
d) Minerals
Explanation
cytoplasm in plant cells, is composed of about 80 percent water and also contains dissolved salts, fatty acids, sugars, amino acids, and proteins such as enzymes. Answer : (b)
Q.26
In the organism, energy is stored in the form of ... .... [ CET CHd. 2003]
0%
a) ATP
0%
b) ADP
0%
c) AMP
0%
d) All the above
Explanation
Energy released by high energy phosphate reaction are as follows ATP + H2O → ADP + Pi; ΔG = -30.5 [kJ/mole] ADP + H2O→ AMP + Pi ; ΔG =-30.5 [kJ/mole] ATP + H2O→ AMP + PPi; ΔG =-40.6[kJ/mole] PPi+ H2O → 2Pi ; ΔG =-31.8[kJ/mole] Answer : (d)
Q.27
ond present between two residues of carbohydrate is ..... .... [ AMU 2010]
0%
a) Amide
0%
b) Phosphodiester
0%
c) Glycosidic
0%
d) Hydrogen bond
Explanation
A glycosidic bond or glycosidic linkage is a type of covalent bond that joins a carbohydrate Answer : (c)
Q.28
DNA strands have ... ..... [ DPMT 2001]
0%
a) Quaternary structure
0%
b) Same polarity
0%
c) Antiparallel polarity
0%
d) Disulphide bonds
Explanation
The strands of a DNA double helix are said to be "antiparallel" because they have the same chemical structure, but are opposite in direction. The direction of a DNA strand is also known as "polarity". Answer : (c)
Q.29
Chief energy food of cell is ... ..... [ Chd CET 2012]
0%
a) Nucleotides
0%
b) Proteins
0%
c) Carbohydrates
0%
d) Vacuoles
Explanation
Chief energy food of cell is Carbohydrates Answer : (c)
Q.30
An AGCT and DNA hydrogen bonds and base pairings occur between ... ... [ CBSE 1999 ]
0%
a) A - U, C- G
0%
b) A-C, G-T
0%
c) A-G, C-T
0%
d) A-T, C-G
Explanation
Answer : (d)
Q.31
Plant deficient of zinc show reduced biosynthesis of growth hormone ... ..[ CBSE 2003]
0%
a) Cytokinin
0%
b) Auxin
0%
c) Abscisic acid
0%
d) Ethylene
Explanation
Plants obtain zinc as Zn2+ ions. It activates various enzymes, especially carboxylases. It is also needed in the synthesis of auxin. Answer : (b)
Q.32
Inulin found in some plant cells is .... .... [ Odisha 2002]
0%
a) Protein
0%
b) Polysaccharide
0%
c) Lipid
0%
d) Vitamin
Explanation
Inulins are a group of naturally occurring polysaccharides produced by many types of plants, industrially most often extracted from chicory. Answer : (b)
Q.33
Match the following ... .... [ kerala 2012]
a)Fatty acid
1.Glutamic acid
b)Phospholipid
2.Tryptophan
c)Aromatic amino acid
3.Lecithin
d)Acidic amino acid
4.Palmitic acid
0%
a) a - 1, b - 2, c - 3, d - 4
0%
b) a - 4, b - 3, c - 2, d - 1
0%
c) a - 2, b - 3, c - 4, d - 1
0%
d) a - 3, b - 4, c - 1, d - 2
Explanation
Fatty acid = Palmitic acid Phospholipid = Lecithin Aromatic amino acid = Tryptophan essential amino acid that serves several important purposes, like nitrogen balance in adults and growth in infants. Acidic amino acid =Glutamic acid is an α-amino acid Answer : (b)
Q.34
Nitrogen bases of DNA are ... ... [ AFMC 2010]
0%
a) ATUC
0%
b) UTGC
0%
c) ATGC
0%
d) AUGC
Explanation
There are four nitrogenous bases in DNA, two purines (adenine and guanine) and two pyrimidines (cytosine and thymine) Answer : (c)
Q.35
Match the columns ... .... [ kerala 2007]
a) Triglycerides
Galactose
b) Lactose
Glycerol
c) RNA
Palmitic acid
d) β-pleats
Uracil
e) Beeswax
secondary structure
0%
a) a - 4, b - 1, c - 5, d - 2, e - 3
0%
b) a - 5, b - 1, c - 4, d - 2, e - 3
0%
c) a - 3, b - 1, c - 4, d - 5, e -2
0%
d) a - 2, b - 1, c - 4, d - 5, e - 3
Explanation
A triglyceride is an ester derived from glycerol and three fatty acids (from tri- and glyceride). a = 2 Galactose is a monosaccharide. When combined with glucose (monosaccharide), through a condensation reaction, the result is the disaccharide lactose. b = 1 RNA = Uracil ; c - 4 The β-sheet (also β-pleated sheet) is a common motif of regular secondary structure in proteins. d - 5, Beeswax main constituents are palmitate, palmitoleate, and oleate esters e - 3 Answer : (d)
Q.36
Paraffin wax is ... ... [ CPMT 2008]
0%
a) Ester
0%
b) Cholesterol
0%
c) Alkanes
0%
d) Monohydric alcohol
Explanation
Chemical formula of Paraffin wax is : CnH2n+2 n = 20 to 40 Answer : (c)
Q.37
ATP = ADP - P hypothesis was given by Lipman in ... ... [ Pb PMT 1997]
0%
a) 1940
0%
b) 1950
0%
c) 1960
0%
d) 1970
Explanation
Answer : (a)
Q.38
Phosphorus is constituent of ... .... [ Pb PMT 1999 ]
0%
a) Carbohydrate
0%
b) Protein
0%
c) Fat
0%
d) Nucleotide
Explanation
Phosphorus is constituent of Nucleotide Answer : (d)
Q.39
Identify the organic compound and its component 'X' ... ... [ CBSE 2012]
0%
a) Cholesterol - Guanine
0%
b) Amino acid - NH2
0%
c) Nucleotide - Adenine
0%
d) Nucleoside - Uracil
Explanation
Answer : (d)
Q.40
Optimum pH for enzyme trypsin is ... ... [ kerala 2000 ]
0%
a) 5.9
0%
b) 4.6
0%
c) 8.5
0%
d) 7.0
Explanation
Trypsin has an optimal pH range of 7.5–8.5; it cleaves predominantly at the carboxyl termini of arginine and lysine residues. Answer : (c)
Q.41
Ribose sugar occurs in ... ... [ KCET 2009]
0%
a) RNA and ATP
0%
b) RNA polymerase and ATP
0%
c) RNA only
0%
d) RNA polymerase, RNA and ATP
Explanation
The 5-carbon sugars ribose important components of nucleotides found in RNA . ATP is composed of ribose, a five-carbon sugar, three phosphate groups, and adenine , a nitrogen-containing compound (also known as a nitrogenous base) Answer : (a)
Q.42
Vitamin B2 is component of coenzyme ... .... [ AIIMS 1997]
0%
a) Pyridoxal phosphate
0%
b) TPP
0%
c) NAD
0%
d) FMN/FAD
Explanation
vitamin is an essential component of two major coenzymes, flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD). Answer : (d)
Q.43
Calcium is required for ... ... [ RPMT 1995]
0%
a) Muscle contraction
0%
b) Blood clotting
0%
c) Bone formation
0%
d) All the above
Explanation
Muscle contraction: Calcium remains in the sarcoplasmic reticulum until released by a stimulus. Calcium then binds to troponin, causing the troponin to change shape and remove the tropomyosin from the binding sites. Cross-bridge cling continues until the calcium ions and ATP are no longer available. Clotting also requires: calcium ions (Ca2+) Calcium as a nutrient is most commonly associated with the formation and metabolism of bone. Answer : (d)
Q.44
A non-protein amino acid is ... .... [ W.B. 2009]
0%
a) Hydroxyproline
0%
b) Cystine
0%
c) Gamma-aminobutyric acid
0%
d) Hydroxylysine
Explanation
Gamma-Aminobutyric acid (GABA) is a non-protein amino acid Answer : (c)
Q.45
In vitro synthesis of DNA was carried out by .... .... [ CPMT 1991]
0%
a) Nirenberg
0%
b) Watson and Crick
0%
c) Khorana
0%
d) Kornberg
Explanation
Arthur Kornberg (March 3, 1918 – October 26, 2007) was an American biochemist who won the Nobel Prize in Physiology or Medicine 1959 for his discovery of "the mechanisms in the biological synthesis of deoxyribonucleic acid (DNA)" together with Dr. Severo Ochoa of New York University. Answer : (d)
Q.46
Which set is correctly matched? ... .... [ AIIMS 2006]
0%
a) Lysine, Glycine, Thiamine-Amino acids
0%
b) Myosin, Oxytocin, Gastrin- Hormones
0%
c) Rennin, Helicase, Hyaluronidase - Enzymes
0%
d) Optic nerve, Oculomotor, Vagus - Sensory nerves
Explanation
Rennin, helicase and hyaluronidase, all are examples of enzymes. Lysine and glycine are amino acids whereas thiamine is a pyrimidine nitrogenous base. Myosin is a protein involved in locomotion. Oxytocin is a hormone of posterior pituitary gland and gastric is a digestive enzyme of gastric gland. Optic is a sensory nerve, occulomotor is a motor nerve and vagus is a mixed nerve. Answer : (c)
Q.47
Pectin is ... ..[ CBSE 2001]
0%
a) Waste product
0%
b) Excretory product
0%
c) Phytolectin
0%
d) Secretory product
Explanation
secretory products leave the protoplast and accumulate in the periplasmic space, from which they then pass through the cell wall and out of the plant cell. Pectin, any of a group of water-soluble carbohydrate substances that are found in the cell walls and intercellular tissues of certain plants. Pectin is Secretory product Answer : (d)
Q.48
Lactose is made of ... ... [ WB 2011]
0%
a) Glucose + Fructose
0%
b) Glucose + Glucose
0%
c) Glucose + Galactose
0%
d) Fructose + Fructose
Explanation
Lactose is composed of glucose and galactose Answer : (c)
Q.49
A triose sugar is ... .... [ kerala 2000 ]
0%
a) Fructose
0%
b) Glucose
0%
c) Deoxyribose
0%
d) Glyceraldehyde
Explanation
A triose is a monosaccharide with three carbon atoms Two naturally occurring trioses are glyceraldehyde ( aldotriose) and dihydroxyacetone ( ketotriose). Answer : (d)
Q.50
Maximum amount of lipoprotein occurs in ... ... [ DPMT 2007]
0%
a) Chylomicron
0%
b) VLDL
0%
c) VDL
0%
d) HDL
Explanation
Chylomicrons also known as ultra low-density lipoproteins (ULDL), are lipoprotein particles that consist of triglycerides (85–92%), phospholipids (6–12%), cholesterol (1–3%), and proteins (1–2%) VLDL contains the highest amount of triglycerides. Answer : (a)
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