32. Lipids may be (a) Fatty acid (b) Glycerol (©) Compounds of both (a) and (b) (a) Allof these 33. CH, - (CH,),, — COOH is (a) Glycerol (b) Fatty acid (c) Cholesterol (a) Phospholipids M Si OO he oN on Yon, ls The true statement about the above structure is (a) Itis the structure of cholesterol. (©) Itis a constituent of cell membrane. (©) Itis the constituent of nucleic acid. (4) Itacts as an enzyme. 35. Palmitic and arachidonic acid contains how many car- bon atoms respectively including carboxyl carbon? (@) 16,19 (b) 15,19 (©) 16,20 (@) 18,20 36. Fats or oils are (a) Monoglycerides _(b) Diglycerides (©) Triglycerides (@) Any of these 37. Which of the following is an example of phospholipid? (a) Palmitic acid (b) Arachidonic acid (c) Lecithin (@) Glycerol 38. Which of the following is correct about lipids? (a) On basis on melting points they are divided into fats and oils (b) Neural tissues are made of simple lipids only. (c) Phospholipids are never part of the cell mem- brane. (d) Lipids are strictly a macromolecule, Proteins and Amino Acids 39. Which of the following is correct about amino acid? (a) It is a compound containing amino and acidic group (-COOH). (b) Itis a substituted methane, (c) Itis based on the nature of of many types. (@) All of these ‘group that they are 40. How many amino acids are used to a ; (a) 18 (b) 20 Protein () 21 (a) 22 41. COOH isa structure of o-amino aig I the different ® group form H—C—NHo ing amino acids are forme, ™ § correct amino acid according we ® group. to (a) RH (glycine) (b) RCH, (alan (©) R9CH,OH (Serine) (4)AI of these "™? 42. The chemical and physical property of am based on nm (a) —NH, group (b) -COOH (©) R-group @) Allof these 43. Match the columns. Par vane (2) Lysine (© Neural @) Glutamic acid (A) Tyrosine, Phenyl 44. Which of the following is zwitterionic form ofm acid? @ R | H§N—CH—COOH ) a I H§N—CH—COO- ©) R | HjN—CH—COO- (d) All of these 45, Protein is (a) Homopolymer (b) Heteropolymer (©) Polypeptide (@) Both (b) and?) 46, Essential amino acids are those which are (a) Not synthesized by our body. (b) Not required by our body. (©) Synthesized by our body. (d) Only used to form proteins. 47, The most abundant protein in animal world (a) RuBisCO (b) Collagen (©) Elastin (@) AlbuminThe most abundant protein in whole biosphere is (@) RuBisCO (b) Collagen (o) Elastin (@) Albumin Protein act as a (a) Enzyme (b) Receptor (©) Antibody (@) All of these «a, Match the columns, (@) Enable glucose transport into cells, (F) Antibody (6) Intercellular ground sub- (©) A-1,B- ‘51. Which one of the following comprises of macromo- lecular fraction? (a) Polynucleotides (b) Polypeptides (©) Polysaccharides (qd) Alll of these $2. Biologist describes protein at. levels. @t (b) 2 (3 (a4 53. The sequence or positional information of amino acid is given by (a) 2° structure (b) 1° structure (©) Tertiary structure (@) Quaternary structure ' In primary structure of protein, (2) Left end represents — Ist amino acid (C-termi- nal amino acid) (6) Right end represents > Last amino acid (N-terminal amino acid) (©) Left end represents Ist amino acid (N-termi- nal amino acid) (@) Right end represents —» Ist amino acid (C-termi- nal amino acid) 58. Name the used amino acid in the following diagram. CHO on H,—COOH \ 4 os on CH oe | I 1 —HN—CH—CO—NH—CH—CO—NH—CH—CO—NH—CH—CO— (a) Serine ~ Cysteine ~ Tyrosine ~ Glutamic acid () Serine ~ Methionine - Tryptophan ~ Glutamic acid (©) Serine ~ Methionine ~ Tyrosine ~ Aspartic acid (@ Serine ~ Cysteine ~ Tyrosine — Aspartic acid Which of the following is correct about secondary structure? c (@) Helix is primary structure, (b) In proteins, only left handed helices are observed. (©) In proteins, only right handed helices are observed. (@) None of the above 57. Which structure is absolutely ly necessary for many bio- logical activities of proteins? (@ 1 () > ©» or 58. When assembly of more than one polypeptide occur, itis known as ___ structure of protein, @ 1 2 © x @r 59. . Which of the following is correct about human hae- moglobin (Hb)? (@) Made up to 2c and 2-B. (b) Present in RBC. (©) Use to carry , and CO,, (AI of these 60. Select the incorrect statement from the following. (a) Most of the enzymes are protein. (b) ‘Hb’ is an example of quatemary structure of protein.(© In primary structure of protein, left hand is N-terminal and right hand is C-terminal. _ (@) In protein or polypeptide, amino acids are linked by glycosidic bond. Nucleic Acids 61. Which of the following possess heterocyclic ring? (a) Adenine (b) Guanine and cytosine (©) Thymine and uracil (4) All of these 62. Identify the nucleoside from the following. (A) Adenosine (B) Uridylic acid (C) Uridine (D)Cytidylic acid (a) A and B only (b) A and C only (©) Cand D only (@) Band C only 63. Which of the following act as a genetic material? (a) DNAandRNA —_(b) Uridylic acid (©) Adenylic acid (@) Guanylic acid 64. Sugar + Nitrogen bases form (@) Nucleoside (b) Nucleotide (©) Peptide (d) Glycoside 65. Sugar + Nitrogen bases + Phosphate forms (a) Nucleoside (b) Nucleotide (c) Peptide (d) Glycoside 66. How many nitrogen atoms are present in adenine? (a) 3 (b) 4 ©s @6 67. The linkage represented by arrow is /t Tryming = Adenine & o=FLon 4 a ky (a) Peptide linkage (b) Phosphodiester linkage (©) Glycosidic linkage (@) N-glycosidic linkage 8. DNA and RNA are (a) Polypeptides (b) Polynucleotides (c) Polysaccharides (@) All of these 69. 70. n. 73. 14, 78. How much percentage of total cellular may, by nucleic acid? fe (a) 3 (b) 2 (© 5-7 @ 10-15 Which of the following are purines? (a) Adenine (b) Guanine (© Cytosine (@ Both (a) ana gy Which ofthe following are pyrimidines (ub (@) Cytosine (6) Thymine ey (©) Uracil @ Allof these DNA contains (@) Ribose (©) 3° deoxyribose (©) 5° deoxyribose (@) 2 deoxyribose The bond present between two nucleotides ig (a) Phosphoester linkage (b) Phosphodiestr li (©) Gycosidic linkage — (d) Peptide linkage ne The Watson~Crick structure of DNA is (@) 1° structure (b) 2° structure (©) 3° structure (d) 4° Structure Which of the following is correct about DNA? (2) Double helical structure in which two strnisy polynucleotide runs antiparallel. (b) Backbone is formed by Sugar-Phosphate- Sup chain, (©) N, bases projected more or less perpendicuiry backbone and faces inside. (d) Alll the above The diagrams present the nitrogenous bases. [defy the correct combination. cane (@) A: Adenine; B: Thymine (b) A: Guanine; B: Uracil (©) A: Adenine; B: Uracil @ A: Guanine; B: Thymine Which one of the following is the diagram Tepresentation of a nucleotide? Oo mm91. Match the columns. Te CY (B) Terpenoids (2) Monoterpenes, Diterpenes © Allaloids —(@) Morphine, Codeine (D) Lectins (4) Carotenoids, Anthocyanin (F) Drugs (6) Vinblastine, Curcumin (@) A:1,B3, C:2, D:4, E:5, F:6 (b) A:4, B:2, C:3, DiI, B:5, F:6 ©) A6,B3,C:5, D:2, E:4, Fl @ All, B:2, C:3, D:4, E:5, F:6 92. Which one of the following are secondary metabolites? (@) Flavonoids and rubber. (®) Antibiotics, coloured pigments and essential oils. (©) Scents, gums and spices, (4) All of these Metabolism and Living State 93. Select the incorrect statement from the following. (@) Acetic acid becomes cholesterol is an example of biosynthetic or anabolic pathway. (b) Glucose becoming lactic acid in our skeletal muscles is an example of degradation or catabolic pathway, (©) Flow of metabolite through metabolic pathway does not have a definite rate and direction, (d) Anabolic pathway requires energy, whereas cata- bolic pathway releases energy. 94. Bond energy, which is stored in our body in the form of ATP is utilized in (a) Biosynthetic phase (¢) Mechanical work 95. Living state is (2) Non-equilibrium and non-steady state, (b) Equilibrium and steady state. (c) Non-equilibrium and steady state. () Equilibrium and non-steady state, 96. Select the correct statement from the following, (A) Biomolecules are in metabolic flux in living state. (B) Living process is a constant effort to prevent falling into equilibrium. (b) Osmotic work (d) All of these ~ am "% (©) Metabolism provides a mechay production of energy. (D) Living state and metabolism jg Sen, (a) Allexcept A (b) Allexce (6) All except D @ Alora , In how many metabolic steps, degradation to lactic acid occurs? of (@ 8 (b)9 (c) 10 (d)2 98. How do living organisms derive their strategies they have evolved? How do qu! hy energy and in what form? Flow do they 4 energy into work? These aspects are ste sub-discipline called ai, (a) Biowar (b) Bioinformatics (©) Bioenergetics (d) Biosynthesis Enzymes 99. Almost all enzymes are (@) Proteins (b) Nucleic acié (©) Carbohydrates (@) Vitamins 100. There are some nucleic acids that behaves ie enzymes, they are called (a) DNAase (b) RNAase (©) Endonuclease (@) Ribozymes 101. of an enzyme is a crevices or pocket it which substrate fit. (@) Inactive site (©) Allosteric site (b) Active site (d) Any of these 102. Select the incorrect statement from the followig (@) Active enzyme has tertiary structure having active sites (substrate binding sites). (b) Enzymes are biocatalysts. (©) Enzymes occur in viruses. (@) Enzymes are mainly protein in nature 103. Select the correct statement from the following (@) At high temperature and high press"? enzymes get damaged at high temperature 40°C), we (b) Ribozymes are nucleic acids betavité nzyme, a (© Thermophilic organisms living in hot ee sulphur springs have enzymes that are retain their catalytic power even at high ture (80-90°C), (@ Allofthese w oto4, Select the incorrect statement from the following, (@) A physical change simply refers to a change in shape without breaking of bonds, (&) Change in state of matter is also physical change. (©) Hydrolysis of starch into glucose is an inorganic chemical reaction, (@ Catalysed reactions proceed at rates vastly higher than that of uncatalyzed ones, 0s. CO, +H,0 > H,Co, Carbonic acid Which one of the following statements is incorrect, about the above reaction? (@) In the absence of enzyme, the rate of H,CO, formation is about 200 molecules per hour. (b) When carbonic anhydrase catalyses the same reaction, there is no change in the rate of H,CO, formation. (©) The reaction catalysed by the enzyme shows dramatically increase speeds about 600,000 molecules being formed every second (rate becomes 10 million times more), (@ The enzymes carbonic anhydrase occurs in abun- dance in RBC. 106. Fill in the blanks in the below statements. 107. 108, A. Armultistep chemical reaction, when each of the steps is catalysed by the same different enzymes is called a way, B. In our skeletal muscle, under anaerobic condi- tions, is formed. C. Inyeast, during fermentation, the glycolytic path- way leads to the production of_ 3, (@) 1-metabolic pathway 2- acetic acid 3 - ethanol (b) 1 - glycolytic pathway 2- lactic acid 3 - ethanol (©) 1- glycolytic pathway 2 - ethanol 3 - ethanol (@) 1- metabolic pathway 2 - lactic acid 3 - ethanol There could be many more ‘altered structural states’ (like transition state) between the stable substrate and the product in enzymatic reaction, These structural states are (@) Stable (b) Unstable (© Metastable (@) Of lower energy than both substrate and product, Which one of the following statements about enzyme is true? if enzyme complex ot 1 path Enzymes are proteins whose three-dimensional shape is key to their functions. Enzymes speed up reactions by lowering activa- tion energy. 109, 110. qu. 112, 113, 3. Enzymes are highly specific for reactions. 4, Enzyme activity is affected by change in tempera- ture and pH. (a) Allexcept 2 (b) All except 1 (c) All except 3 (d) All of these Which of the following are unique features about the enzyme? (a) They are not consumed by the enzyme-mediated reaction. (b) They are not altered by the enzyme-mediated re- action. (©) They lower the activation energy. (@) All of these The catalytic cycle of an enzyme action can be described in the following steps. Arrange them in sequence accordingly. 1. The binding of the substrate induces the enzyme to alter its shape, fitting more tightly around the substrate. The substrate binds to the active site of the en- zyme, fitting into the active site. The enzyme releases the products of the reaction and the free enzyme is ready to bind to another molecule of the substrate and run through the catalytic cycle once again. ‘The active site of the enzyme, now in close prox- imity of the substrate breaks the chemical bonds of the substrate and the new enzyme-product complex is formed. @ 1323334 ) 2315453 ©) 13234353 (231334 The activation energy for given reaction is (ie., reac- tant — product) (a) Energy of transition state — Energy of substrate (b) Energy of transition state ~ Energy of product (©) Threshold energy — Energy of transition state @ Allare correct Which one of the following is correct? (a) E+S ES EP EP (bt) E+S ES SEPSE+P (©) E+S+ES>EPSE-P @ E+S+ES>EP>E-P Which one of the graphs shows the effect of pH on the enzymatic activity (EA)? @) ) EA i Eh pH -© @ EA ( \ EA oo pH 114. Which one of the graphs shows the effect of tempera~ ture on the enzymatic activity? @v (b) v Temperature ‘Temperature ov Ca ov Z Temperature: ‘Temperature 115. Which one of the following graphs shows the rela- tionship between enzymatic activity and substrate concentration (S)? @ © i (\ : a s s © @ s s 116. Each enzyme shows its highest activity at particular temperature and pH called the __(1)__ temperature and _(2)__ pH. These (1) and (2) are respectively (a) Optimum, Optimum (b) Minimum, Minimum (c) Maximum, Maximum (d) Minimum, Maximum 117. Select the correct statement, (a) Low temperature preserves the enzyme in a tem- porarily inactive state, (b) High temperature destroys the enzymatic activity because proteins are denatured by heat. (c) Activity enzymes declines both below and above the optimum value, (d) All the above 118. Select the correct statement from the following. (a) Increase in substrate concentration, increases velocity of enzymatic reaction at first then it 119. 120. 8 121, 122. 123, 124, 125, reaches maximum and further incremen, occur. to (b) In competitive inhibition, the inhibitor ¢ sembles the substrate in its molecular he (c) Competitive inhibition are often useq trol of bacterial pathogens. (d) All the above. The activity of an enzyme is also sensitive tg ence of specific chemicals that bind to the When the binding of the chemical shuts off, activity, the process is called cal is called an 3 (a) Activation, activator (b) Inhibition, inhibitor (©) Inhibition, promoter (d) Activation, inhibitor Inhibition of succinate dehydrogenase by malay, an example of (a) Non-competitive inhibition (b) Negative feedback (©) Allosteric inhibiti (@) Competitive inhibition Enzymes are divided into (a) 6 classes, each with 4 — 13 subclasses and nami accordingly by a four-digit number. (b) 7 classes, each with 3 — 13 subclasses and nami accordingly by a four-digit number. (c) 7 classes, each with 4 — 13 subclasses and nami accordingly by a three-digit number. (d) 6 classes, each with 4 — 20 subclasses and nam accordingly by a four-digit number. Enzymes which catalyse oxidoreduction between™™ substrate belongs to the class (a) Oxidoreductases (b) Transferases (©) Hydrolases (d) Ligases Enzymes which catalyse the transfer of group than hydrogen belongs to the class (a) Oxidoreductases (b) Transferases (c) Hydrolases (a) Ligases Enzymes which catalyse hydrolysis of est peptide, glycosidic bond belongs to the class (a) Oxidoreductases (b) Transferases (©) Hydrolases (d) Ligases Py Enzymes that catalyse the removal of g0UP substrates by mechanisms other than hydrolys' ing double bonds is known as (a) Oxidoreductase _(b) Transferase (©) Hydrolase (d) Lyase inthe, —— the gt ktymes which catalyse inter-conversion of optical, netic oF positional isomers betongs to the elass Isomerases, (b) Transferases {o Hoeolases (A) Ligases mes catalysing the linking together of two compounds, for example, enzymes which catalyse the janine oF C-0. C-S, C-N, P.O, ee, bonds belongs to the class of 1 (a) Isomerases () Transferases (©) Hydrolases (@) Ligases a, How many types of cofactor can be identified? @! 2 @3 4 9. The suffix “-* added to substrate for naming the eazyme is @ -# ) ~in © -zyme (d) ose u, Pryalinis an example of (@) Oxidoreductase (6) Transferase (©) Hydrolase (@) Ligase 31. When apoenzyme is separated from its metal compo- nent, its activity is (@) Decreased (©) Lost 32. Cofactors are @) Prosthetic groups () Co-enzymes © Metallic ions @ Allof these 133. Which of the following combinations is correct? (@) Metal ions loosely attached with Apoenzyme — Activators ©) Non-protein organic part attached tightly to ‘Apoenzyme — Prosthetic group ©) - Protein organic part attached loosely to poenzyme — Coenzyme (All the above 134 Which one of the following is not a cofactor? (@) Co-enzyme (b) Metal ions ©) Prosthetic group (4) Apoenzyme 135, Hlaem is the prosthetic group of. © Peroxidase Co (b) Catalase (©) Both (a) and (by (d) None of these (b) Increased (@)Remains unaffected 136, 137, 138. Zn is the activator of which of the following enzyme? (a) Carbonic anhydrase (b) Carboxypeptidase (c) Carboxylase (d) All of these Which of the following statements is correct? 1. Catalytic activity is lost when the cofactor is removed from the enzyme. 2. Coenzyme nicotinamide adenine dinucleotide (NAD) and NADP contains the vitamin niacin. 3. Biomacromolecules have a hierarchy of struc- tures, such as primary, secondary, tertiary and quaternary. 4. Enzymes lower activation energy of reactions and enhance greatly the rate of the reactions. 5. Nucleic acids carry hereditary information and are passed on from parental generation to progeny. (@) Land 5 only (b) 2 and 3 only (©) 2and 5 only (@) All of these The figure given below shows the conversion of a sub- strate into product by an enzyme. In which one of the options (ad), the components of reaction labelled as A,B, Cand D are identified correctly? B Product (p) Progress of reaction (a) A: Potential energy, B: Transition state, C: Activation energy with enzyme, D: Activation energy without enzyme, (©) A: Transition state, B: Potential eneng C: Activation energy without enzyme, D: Active, tion energy with enzyme. (©) A: Potential energy, B: Transition state C:; Activation energy with enzyme, D: Activation energy without enzyme, (@) A: Activation energy with enzyme, B: Transi- tion state, C: Activation energy without enzyme D: Potential energy. i139. Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the cate~ gory mentioned against it? (a) Guanine, Adenine - Purines (b) Adenine, Thymine - Purines (©) Thymine, Uracil- Pyrimidines (a) Uracil, Cytosine - Pyrimidines. 140. A competitive inhibitor of succinic dehydrogenase is (a) c-ketoglutarate —(b) Malate (©) Malonate (d) Oxaloacetate 141. About 98 percent of the mass of every living organ- ism is composed of just six element including carbon, hydrogen, nitrogen, oxygen and (a) sulphur and magnesium () magnesium and sodium (©) calcium and phosphorus (@) phosphorus and sulphur 142. An organic substance bound to an enzyme and essen- tial for its activity is called (a) Holoenzyme (b) Apoenzyme (©) Isoenzyme (@ Coenzyme 143. Antiparallel strands of a DNA molecule means that (a) The phosphate groups of two DNA strands, at their ends. share the same positions (b) The phosphate groups at the start of two DNA strands are in opposite position (pole) (©) One strand turns clockwise (4) One strand turns anti-clockwise 144. Which one of the following hydrolyses internal phos- phodiester bonds in a polynucleotide chain? (@) Lipase (b) Protease (0) Endonuclease (@) Exonuclease 145. Which of the following is the simplest amino acid? (a) Alanine (b) Asparagine (©) Glycine (4) Tyrosine 146. Enzymes, vitamins and hormones can be classi- fied into a single category of biological chemicals, because all of these (a) Help in regulating metabolism (b) Are exclusively synthesized in the body of a liv- ing organism as at present (c) Are conjugated proteins (b) Enhance oxidative metabolism 147. The catalytic efficiency of two different enzymes can be compared by the (a) Formation of the product (b) pH optimum value (©) K,, value (d) Molecular size of the enzyme 148. Which ofthe following statements rep, *% inhibition is correct? (a) Competitive inhibition is seen competes with an enzyme for fing hibitor protein wo (b) Competitive inhibition is seen when y. and the inhibitor compete for the the enzyme. Ate (©) Non-competitive inhibition of an overcome by adding large amount of (@ Non-competitive inhibitors often Vian zyme irreversibly. te, 149, Which form of RNA has structure reseni, leaf? (@) rRNA (b) hn RNA (©) mRNA (@) tRNA 150, In which one ofthe following enzymes, iscqpey essarily associated as an activator? (a) Carbonic anhydrase (b) Tryptophanase (©) Lactic dehydrogenase @ Tyrosinase 151. Collagen is (a) fibrous protein () globular protin © lipid (@) carbohydrate 152, Which of the following is a reducing sugu? (@) galactose (b) gluconic acid (©) B- methyl galactoside (d) sucrose : 153. Lipids are insoluble in water because lipit™ are (a) Hydrophilic (b) Hydrophobe (c) Neutral (d) Zwitter ions DRA, Spoilage of oil can be detected by cael (a) Oleic acid (b) Linoene (©) Linoleic acid @ Baste 155, Most abundant organic compound 0" « (a) Protein (b) Cells? (c) Lipids (a) Sterol_— which is an essential amino acid? (a) Serine (b) Aspartic acid (©) Glycine (@) Phenylalanine 1. Enzymes enhance the rate of reaction by (a) Forming a reactant-product complex. (b) Changing the equilibrium point of the reaction (©) Combining with the product as soon as it is formed (@ lowering the activation energy of the reaction 158, Feedback inhibition of an enzymatic reaction is caused by (@) End product (©) Enzyme 156+ () Substrate (@) Rise in temperature 159, One ofthe similarities between DNA and RNA js that, both (a) are polymers of nucleotides (&) are capable of replicating (©) have smilar sugars —@ have similar pyrimidine bases 160. Conjugated proteins containing carbohydrates as prosthetic group are known as (@) Chromoproteins _(b) Glycoproteins (© Lipoproteins (@ Nucleoproteins Length of one tum of helix in a B-form DNA is approximately @) 34nm (b) 2nm (© 034nm @ 200m ‘The secondary structures of that portion of an inte- gral protein that is buried in the lipid bilayer of a cell membrane is 161. 162. (@) Bestrand (b) B-bend (©) random coil @ wehelix 163. Lactose is composed of (@) Glucose + Glucose (©) Glucose + Fructose (©) Fructose + Galactose @ Glucose + Galactose Cellulose, the most important constituent of plant cell wall is made of (@) Unbranched chain of glucose molecules linked by -, 4 glycosidic bond (©) Branched chain of glucose molecules linked by B-1, 4 glycosidic bond in straight chain and 1, 6 glycosidic bond at the site of branching (©) Unbranched chain of glucose molecules linked by B-1, 4 glycosidic bond: (@) Branched chain of glucose molecules linked by 1, 6 glycosidic bond at the site of branching. 165. 166. 167. 168. 169. 170. am. 172. 173. 174, 175. ‘The enormous diversity of protein molecules is due mainly to the diversity of (a) Amino groups on the amino acids (b) R groups on the amino acids : (©) Amino sequences within the protein molecule (d) Peptide bonds Most diverse macromolecules, found in the cell both physically and chemically are (a) Proteins (b) Carbohydrates (©) Nucleic acids (@) Lipids In which one of the following groups, all the three examples of polysaccharides? (a) Starch, glycogen, cellulose (b) Sucrose, maltose, glucose (c) Glucose, fructose, lactose (d) Galactose, starch, sucrose The nitrogenous organic base purine occurring in RNA is (@) Cytosine (b) Thymine (©) Guanine (d) Uracil ‘A polysaccharide, which is synthesized and stored in liver cells is, (@) Lactose (b) Galactose (©) Arabinose (a) glycogen ‘Two free ribonucleotides units are interlinked with (@) peptide bond (b) covalent bond (©) hydrogen bond —_—_(d) phosphodiester bond Which of them contains four pyrimidine bases? (a) GATCAATGC (b) GCUAGACAA (© UAGCGGUAA —(d) TGCCTAACG The four elements making 99% of living system (@) CHos (b) CHOP (©) CHON (@ CNOP An enzyme brings about (a) Decrease in reaction time (b) Increase in reaction time (©) Increase in activation energy (@ Reduction in activation energy Which is wrong about nucleic acids? (a) DNAs single stranded in some viruses (b) RNA is double stranded occasionally (c) Length of one helix is 45 A in B-DNA (@ One turn of Z-DNA has 12 bases Which is distributed more widely in a cell? (@) DNA (b) RNA (©) Chloroplasts (qd) Sphaerosomes _ iii aaSs 176, 177. 178. 179. Living cell contains 60-75% water. Water present in human body is (a) 60-65% (b) 50-55% (c) 75-80% (d) 65-70% Adenine is (a) Purine (b) Pyrimidine (d) Nucleotide ly different molecular structure (c) Nucleoside Enzymes having slight but performing identical activity are (a) Homoenzymes (b) Isoenzymes (c) Apoenzymes (d) Coenzymes DNA is composed of repeating units of (a) Ribonuclesides (b) Deoxyribonucleosides (c) Ribonucleotides (d) Deoxyribonucleotides 180. 182. 183. A segment of DNA has 120 adenine ang a N bases. The total number of nucleotides pr 20 Voy segment is Sent tint (a) 120 (b) 240 (c) 60 (d) 480 The basic unit of nucleic acid is (a) Pentose sugar (b) Nucleoid (c) Nucleoside (d) Nucleotide A nucleotide is formed of (a) Purine, pyrimidine and phosphate (b) Purine, sugar and phosphate (c) Nitrogen base, sugar and phosphate (d) Pyrimidine, sugar and phosphate In double helix of DNA, two DNA strands g (a) Coiled around a common axis a (b) Coiled around each other (c) Coiled differently (d) Coiled over protein sheathOH On 78. Which one is correct about the following diagram? HOCH, Adenine OH On (@) Itis a mucleotide, ©) It contains pyrimidine nitrogen base, (©) Itis used to form DNA. (@) Itis used to form RNA. 79. Which one of the following is correct about DNA? (@) DNA exist as double helix. (©) Two strands of polynucleotide in DNA are antiparallel inside, (4) All the above 80. At each step of ascent in B-DNA double helical structure, the strand turns (a) 36° (b) 72° © 90° @) 18° 81. One full tum of B-DNA helix strand would involve how many base pairs? @ 12 (b) 8 © 10 @ 20 82. Select the incorrect statement from the following, (@) Nebases (A, G, C, , U) have heterocyclic rings, (b) In many oF rganisms, DNA is the genetic material, (c) Adenylic acid is nucleoside. Aor (@) The rise per base pair in B-DNA is 3.4 83, There are _ hydrogen bonds between A and T, and ___ hydrogen bonds between G and C. (a) 2,2 (b) 3,3 ©) 2,3 (d) 3,2 Secondary and Primary Metabolites 84. Plants produce an enormous diversity of sub- stances that have no apparent roles in growth and development processes and are classified under the heading of (a) Primary metabolites (b) Secondary metabolites (©) Necessary metabolites (@) Tertiary metabolites ‘Which one of the following is secondary metabolite? (a) Amino acid (b) Sugar (©) Flavonoids and antibiotics @) Protein Which one of the following statement is incorrect? (@) Primary metabolite has identifiable functions, (©) Some secondary metabolites have ecological importance. (©) Secondary metabolites like rubber, drugs, Species, scents and pigments are useful to human welfare, (@ Secondary metabolites are found in fungi, ‘microbes and plants. s Which of the following are pigments? (@) Morphine (b) Vinblastine (©) Carotenoids and anthocyanin (@) Ricin Which one of the following is not a polymeric substance? (@) Rubber () Morphine (©) Protein (@) Cellulose Which of the following secondary metabolites are used as drugs? (a) Abrin + Ricin (b) Vinblastine + Curcumin, (©) Anthocyanin (@) Monoterpenes 89, Which one of the following is secondary metabolite? (@) Lemon oil grass (b) Sucrose (©) Lactose (@) Glycine31.(d) 41.(d) 51. (d) 61.(d) 71. (a) 81. (c) 91.(b) 101. (b) 111. (a) 121. (a) 131. (c) 32. (d) 42.(d) 52. (d) 62. (b) 72. (d) 82. (c) 92. (d) 102. (c) 112. (b) 122. (a) 132. (d) 33.(b) -34.(b) 43.(a) 44.(0) 53.(b) 54.(c) 63.(a) 64. (a) 73.(b) _74.(b) 83.(c) 84. (b) 93.(c) 94. (d) 103.(d) 104. (c) 113.(c) —-114.() 123.(b) 124. (0) 133.(d) 134. (d) Multiple Choice Question: Level II 139. (b) 149. (d) 159. (a) 169. (d) 179. (a) 140. (c) 150. (d) 160. (b) 170. (d) 180. (d) -(c) 142. (a) a S 152. (a) 161.(a) 162. (d) 171.(a) 172. (c) 181.(d) 182. (c) 35. (c) 45. (d) 55. (a) 65. (b) 75. (a) 85. (c) 95. (c) 105. (b) 115. (d) 125. (d) 135. (c) 143. (a) 153. (b) 163. (4) 173. (d) 183, (a) 36. (d) 46. (a) 56. (c) 66.(c) 76.(c) 86.(d) 96. (d) 106. (d) 116. (a) 126. (a) 136. (d) 144. (c) 154. (d) 164. (c) 174, (0) 37.(c) 47.(b) 57.(b) 67. (b) - 77.(d) 87. (c) 97.(c) 107. (b) 117. (a) 127.(4) 137. (d) 145. (c) 155. (b) 165. (c) 175. (b) 38. (a) 48. (a) 58. (d) 68. (b) 78. (d) 88. (b) 98. (c) 108. (d) 118. (d) 128. (c) 138. (a) 146. (a) 156. (d) 166. (a) 176. (d) =u) 39.(d) 49. (d) 59.(d) 69.(c) 79.(d) 89.0) 99. (a) 109. (d) 119. (b) 129. (a) 147. (0) 157.(d) 167. (a) 177.(a) Me My 1 110, Pr) BN 148.) 158.0) 168.() 178.0)