The catalytic power of enzymes is due to (a) the presence of amino acids in their structures (b) their high molecular weight (c) their ability to lower the activation energy of the reaction (d) their limited solubility in water and other solvents

The catalytic power of enzymes is due to (a) the presence of amino acids in their structures (b) their high molecular weight (c) their ability to lower the activation energy of the reaction (d) their limited solubility in water and other solvents
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The catalytic activity of enzymes is due to their capacity to lower the __________ energy. (A) Activation (B) Potential (C) Kinetic (D) None of these

Description : The catalytic activity of enzymes is due to their capacity to lower the __________ energy. (A) Activation (B) Potential (C) Kinetic (D) None of these

Last Answer : (A) Activation

Pick out the wrong statement regarding the solubility characteristics of high polymers. (A) Greater the degree of cross-linking in the polymer, lesser is its solubility (B) Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents (C) Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent (D) High molecular weight polymers on dissolving gives solution of very low viscosity

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Last Answer : (D) High molecular weight polymers on dissolving gives solution of very low viscosity

Pick out the wrong statement. (A) Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C(B) Most of the enzyme catalysed reactions involve at least two substrates (C) Enzymes help in increasing the activation energy of the reaction (D) Equilibrium concentrations in enzyme catalysed reactions can be calculated by using the thermodynamic properties of substrates & prod

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Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the (A) Activation energy (B) Equilibrium constant (C) Heat of reaction (D) None of these

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Last Answer : (A) Activation energy

For a heterogeneous catalytic reaction (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction (B) A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important (C) The catalyst does not form an intermediate complex with the reactant (D) The surface of the catalyst does not play an important role during reaction

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Last Answer : (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction

Pick out the wrong statement. (A) Use of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition (B) Alumina is added as a promoter to iron catalyst in ammonia synthesis reaction (C) Activation energy for a reaction is obtained from the intercept of the Arrhenius plot (D) Presence of inerts affects the equilibrium conversion of reactants in a chemical reaction

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Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in (A) Blood (B) Saliva (C) Intestine (D) Gland

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If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to (A) The intrinsic activation energy E (B) (E + ED) where ED is activation due to diffusion (C) (E + ED)/2 (D) ED/2

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Last Answer : (D) ED/2

Pick out the wrong statement. (A) At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature (B) Normally, the gases which are easily liquefied are more soluble in common solvents (C) The gases which are capable of forming ions in aqueous solution are much more soluble in water than in other solvents (D) At constant pressure, solubility of a gas in a liquid increases with rise in temperature

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In the process of activation of amino acids for protein synthesis, the number of high energy phosphate bond equivalent utilised is (A) 0 (B) 1 (C) 2 (D) 4

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Pick out the correct statement. (A) In catalytic reactions, the catalyst reacts with the reactants (B) A catalyst initiates a chemical reaction (C) A catalyst lowers the activation energy of the reacting molecules (D) A catalyst cannot be recovered chemically unchanged at the end of the chemical reaction

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The rate expression for a heterogeneous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A) (A) E (B) E + ΔHA (C) E + ΔHA - ΔHR ) (D) ΔHA + ΔHR

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Last Answer : (C) E + ΔHA - ΔHR )

Consider (R)- and (S)-2-butanol. Which physical property distinguishes the two compounds? (a) melting point(b) solubility in common solvents(c) Rotation of plane-polarized light(d) Infrared spectrum

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The catalytic efficiency of two different enzymes can be compared by the (a) formation of the product (b) pH of optimum value (c) Km value (d) molecular size of the enzyme.

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Energy for activation of amino acids during proteins synthesis comes from

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Activation or inactivation of certain key regulatory enzymes is accomplished by covalent modification of the amino acid: (A) Tyrosine (B) Phenylalanine (C) Lysine (D) Serine

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Which of the following step of translation does not consume a high energy phosphate bond? (a) Peptidyl transferase reaction (b) Aminoacyl tRNA binding to A-site (c) Translocation (d) Amino acid activation

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Which of the following step of translation does not consume a high energy phosphate bond? (a) Peptidyl transferase reaction (b) Aminoacyl tRNA binding to A-site (c) Translocation (d) Amino acid activation

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__________ hormone is a single chain polypeptide having 32 amino acids with molecular weight of 3,600. (A) Testosteron (B) Thyroxine (C) Calcitonine (D) Vasopressin

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Enzymes increases the rate of reactions by (A) Increasing the free energy of activation (B) Decreasing the energy of activation (C) Changing the equilibrium constant of the reaction (D) Increasing the free energy change of the reaction

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Proteins are chains of _____ that sometimes function as _____. a. monosaccharaides; energy compounds b. lipids; structural materials c. amino acids; enzymes d. disaccharides; enzymes

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The purity of an isolated protein can be tested by employing various methods. (A) Solubility curve (B) Molecular weight (C) Ultra Centrifugation (D) Immuno Ractivity (E) All of these

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The most important factor governing absorption of a drug from intact skin is: A. Molecular weight of the drug B. Site of application C. Lipid solubility of the drug D. Nature of the base used in the formulation

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Pick out the wrong statement. (A) Linear polymers are formed from bifunctional groups only and are normally thermoplastic (B) Cross-linked branched chain polymers are either elastometric or thermosetting (C) Branching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point (D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

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Pick out the correct statement. (A) A lower temperature favours the reaction of lower activation energy (B) The dispersion number for a reactor/vessel is uL/D (C) The rate controlling step in a reaction involving many steps is the fastest step (D) Pore volume and porosity of a catalyst is measured by Brunauer￾Emmett-Teller (BET) technique

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Last Answer : (A) A lower temperature favours the reaction of lower activation energy

If the rate of a chemical reaction becomes slower at a given temperature, then the (A) Initial concentration of the reactants remains constant (B) Free energy of activation is lower(C) Entropy changes(D) Free energy of activation is higher

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What happens when a catalyst is added to a system at equilibrium? A The reaction follows an alternative pathway of lower activation energy. B The heat of reaction decreases. C The potential energy of the reactants decreases. D The potential energy of the products decreases. E The rate of chemical reaction decreases.

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Last Answer : A The reaction follows an alternative pathway of lower activation energy.

Enzymes contain 1. Peptide bonds 2. Amino acids 3. Halogens 4. Fatty acids The correct answers are: (a) 1 and 4 (b) 1,3 and 4 (c) 1 and 2 (d) 2, 3 and 4

Description : Enzymes contain 1. Peptide bonds 2. Amino acids 3. Halogens 4. Fatty acids The correct answers are: (a) 1 and 4 (b) 1,3 and 4 (c) 1 and 2 (d) 2, 3 and 4

Last Answer : Ans:(c)

How many high-energy phosphate bond equivalents are required for amino acid activation in protein synthesis? (A) One (B) Two (C) Three (D) Four

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Last Answer : Answer : B

The active site of an enzyme is formed by a few of the enzymes: (A) R groups of the amino acids (B) Amino groups of the amino acids (C) Carboxyl group of the amino acids (D) Exposed sulfur bonds

Description : The active site of an enzyme is formed by a few of the enzymes: (A) R groups of the amino acids (B) Amino groups of the amino acids (C) Carboxyl group of the amino acids (D) Exposed sulfur bonds

Last Answer : Answer : C

For biosynthesis of proteins (A) Amino acids only are required (B) Amino acids and nucleic acids only are required (C) Amino acid, nucleic acids and ATP only are required (D) Amino acids, nucleic acids, ATP, GTP, enzymes and activators are required

Description : For biosynthesis of proteins (A) Amino acids only are required (B) Amino acids and nucleic acids only are required (C) Amino acid, nucleic acids and ATP only are required (D) Amino acids, nucleic acids, ATP, GTP, enzymes and activators are required

Last Answer : Answer : D

The function of Haemoglobin is to : (1) provide amino acids (2) carry oxygen (3) provide enzymes (4) help in excretion

Description : The function of Haemoglobin is to : (1) provide amino acids (2) carry oxygen (3) provide enzymes (4) help in excretion

Last Answer : (2) carry oxygen Explanation: Haemoglobin is an ironcontaining protein in red blood cells. Hemoglobin in the blood carries oxygen from the respiratory organs (lungs or gills) to the rest of ... resultant carbon dioxide to bring it back to the respiratory organs to be dispensed from the organism.

The major role of minor elements inside living organisms is to act as (a) co-factors of enzymes (b) building blocks of important amino acids (c) constituent of hormones (d) binder of cell structure.

Description : The major role of minor elements inside living organisms is to act as (a) co-factors of enzymes (b) building blocks of important amino acids (c) constituent of hormones (d) binder of cell structure.

Last Answer : (a) co-factors of enzymes

All enzymes are made of (A) Fats (B) Carbohydrates (C) Proteins (D) Amino acids

Description : All enzymes are made of (A) Fats (B) Carbohydrates (C) Proteins (D) Amino acids

Last Answer : (C) Proteins

The function of Haemoglobin is to : (1) provide amino acids (2) carry oxygen (3) provide enzymes (4) help in excretion

Description : The function of Haemoglobin is to : (1) provide amino acids (2) carry oxygen (3) provide enzymes (4) help in excretion

Last Answer :  carry oxygen

The enzymes are basically (1) carbohydrates (2) lipids (3) proteins (4) amino acids

Description : The enzymes are basically (1) carbohydrates (2) lipids (3) proteins (4) amino acids 

Last Answer : proteins

Pick out the wrong statement. (A) A particular chemical reaction is more temperature sensitive at low temperatures (B) A very high value of equilibrium constant, K (K >> 1) indicates that the reaction is practically irreversible in nature (C) The intercept of the Arrhenius plot is called the 'activation energy' (D) Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant regions

Description : Pick out the wrong statement. (A) A particular chemical reaction is more temperature sensitive at low temperatures (B) A very high value of equilibrium constant, K (K >> 1) indicates that the ... ) Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant regions

Last Answer : (C) The intercept of the Arrhenius plot is called the 'activation energy