Which one of the following statements is incorrect about enzyme catalysis ?

Which one of the following statements is incorrect about enzyme catalysis ?
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Which one of the following statements is incorrect about enzyme catalysis ? A. Enzymes are ... at optimum temperature D. Enzymes action is specific
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20. Which one of the following statements is incorrect about enzyme catalysis? (1) Enzymes are least reactive at optimum temperature (2) Enzymes are mostly proteinous in nature (3) Enzyme action is specific (4) Enzymes are denaturated by ultraviolet rays and at high temperature

Description : 20. Which one of the following statements is incorrect about enzyme catalysis? (1) Enzymes are least reactive at optimum temperature (2) Enzymes are mostly proteinous in nature (3) Enzyme action is specific (4) Enzymes are denaturated by ultraviolet rays and at high temperature

Last Answer : Enzymes are least reactive at optimum temperature

Which of the following is incorrect about heterogeneous catalysis? a. The most effective catalysts are those which have small surface area b. Seperation of catlyst is easy c. Increase in the rate of reaction is due to decrease in the activation energy d. It is based upon the phenomenon of adsorption

Description : Which of the following is incorrect about heterogeneous catalysis? a. The most effective catalysts are those which have small surface area b. Seperation of catlyst is easy c. Increase in the rate of reaction is due to decrease in the activation energy d. It is based upon the phenomenon of adsorption

Last Answer : a. The most effective catalysts are those which have small surface area

........................ studied the kinetics of enzyme catalysis. a. Arrhenius b. Rutherford c. Micheal Faraday d. Michaelis & Menten

Description : ........................ studied the kinetics of enzyme catalysis. a. Arrhenius b. Rutherford c. Micheal Faraday d. Michaelis & Menten

Last Answer : d. Michaelis & Menten

Substance which increase the activity of certain enzymes called (a) Pro-enzyme (b) Iso-enzymes (d) Co-enzymes (d) Catalysis

Description : Substance which increase the activity of certain enzymes called (a) Pro-enzyme (b) Iso-enzymes (d) Co-enzymes (d) Catalysis

Last Answer : c

Following statements describe the characteristics of the enzyme restriction endonuclease. Identify the incorrect statement. (a) The enzyme recognises a specific palindromic nucleotide sequence in the DNA. (b) The enzyme cuts DNA molecule at identified position within the DNA. (c) The enzyme binds DNA at specific sites and cuts only one of the two strands. (d) The enzyme cuts the sugar-phosphate backbone at specific sites on each strand.

Description : Following statements describe the characteristics of the enzyme restriction endonuclease. Identify the incorrect statement. (a) The enzyme recognises a specific palindromic nucleotide sequence in the DNA. (b) ... (d) The enzyme cuts the sugar-phosphate backbone at specific sites on each strand.

Last Answer : (c) The enzyme binds DNA at specific sites and cuts only one of the two strands.

Which one of the following statements is incorrect? (a) The competitive inhibitor does not affect the rate of breakdown of the enzyme-substrate complex. (b) The presence of the competitive inhibitor decreases the Km of the enzyme for the substrate. (c) A competitive inhibitor reacts reversibly with the enzyme to form an enzyme-inhibitor complex. (d) In competitive inhibition, the inhibitor molecule is not chemically changed by the enzyme.

Description : Which one of the following statements is incorrect? (a) The competitive inhibitor does not affect the rate of breakdown of the enzyme-substrate complex. (b) The presence of the competitive inhibitor ... . (d) In competitive inhibition, the inhibitor molecule is not chemically changed by the enzyme.

Last Answer : (b) The presence of the competitive inhibitor decreases the Km of the enzyme for the substrate

Define the terms : a. Inhibition b. Electrophoresis c. Catalysis.

Description : Define the terms : a. Inhibition b. Electrophoresis c. Catalysis.

Last Answer : Define the terms : a. Inhibition b. Electrophoresis c. Catalysis.

(4) None of these Explanation: Catalysis is the change in rate of a chemical reaction due to the participation of a substance called a catalyst. Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by the reaction itself. A catalyst may participate in multiple chemical transformations. Catalysts that speed the reaction are called positive catalysts.

Description : (4) None of these Explanation: Catalysis is the change in rate of a chemical reaction due to the participation of a substance called a catalyst. Unlike other reagents that ... may participate in multiple chemical transformations. Catalysts that speed the reaction are called positive catalysts.

Last Answer : Table salt gets moist during rainy season because – (1) sodium chloride is hygroscopic (2) sodium chloride is deliquescent (3) sodium chloride contains some quantity of sodium iodide (4) sodium chloride contains hygroscopic impurities like magnesium chloride

What do you mean by activity and selectivity of catalysis?

Description : What do you mean by activity and selectivity of catalysis? 

Last Answer : Ans. Activity of catalyst means to increase the extent of chemisorption. Selectivity of Catalyst means to direct a reaction to form selective product.

What is meant by induced catalysis ? Give an example.

Description : What is meant by induced catalysis ? Give an example.

Last Answer : It is a phenomenon in which a chemical reaction increases the rate of another reaction which otherwise may not occur in similar conditions.  Eg. Sodium arsenite (Na3AsO3 ) is not oxidised in air but if ... a solution containing Na3AsO3 and Na2 SO3 , then both AsO3 3- and SO3 2- ions are oxidised.

Shape-selective catalysis

Description : Shape-selective catalysis

Last Answer : Shape-selective catalysis : A catalytic reaction that depends upon the pore structure of catalyst as well as the size of reactant & product molecules is called Shape-selective catalysis.

Mechanism of heterogeneous catalysis

Description : Mechanism of heterogeneous catalysis

Last Answer : Mechanism of heterogeneous catalysis :- The steps are as follows : (i) Diffusion of reactants on the surface of catalyst. (ii) Adsorption of reactants on the surface of catalyst. (iii) ... (ii) Desorption of product from solid surface. (iii) Diffusion of products away from solid surface.

__________ explains the mechanism of catalysis. (A) Activated complex theory (B) Collision theory (C) Thermodynamics (D) None of these

Description : __________ explains the mechanism of catalysis. (A) Activated complex theory (B) Collision theory (C) Thermodynamics (D) None of these

Last Answer : (A) Activated complex theory

Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2 /sec.D1 = diffusion co-efficient; cm2 /sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3 /sec. V = volume, cm3 .) (A) Reactor dispersion number (D/vL) (B) Reduced time (vt/V) (C) Thiele modulus L √(k/D1 ) (D) None of these

Description : Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2 /sec.D1 = diffusion co-efficient; cm2 /sec L = length of the reactor, cm t = time, sec, v = volumetric ... (D/vL) (B) Reduced time (vt/V) (C) Thiele modulus L √(k/D1 ) (D) None of these

Last Answer : (D) None of these

A family of organic compounds whose molecules will add water under an acid catalysis and change into alcohols are the: w) alkenes x) alkanes y) aromatic hydrocarbons z) cycloalkanes

Description : A family of organic compounds whose molecules will add water under an acid catalysis and change into alcohols are the: w) alkenes x) alkanes y) aromatic hydrocarbons z) cycloalkanes

Last Answer : ANSWER: W -- ALKENES

The action of concentrated sulfuric acid on sugar best described as: w) catalysis x) oxidation y) reduction z) dehydration

Description : The action of concentrated sulfuric acid on sugar best described as: w) catalysis x) oxidation y) reduction z) dehydration

Last Answer : ANSWER: Z -- DEHYDRATION

Which of the following statements are incorrect ?a)Photosynthesis is a chemical change b) Digestion is a chemical change c)Formation of manure from vegetable was ... -Science-7

Description : Which of the following statements are incorrect ?a)Photosynthesis is a chemical change b) Digestion is a chemical change c)Formation of manure from vegetable was ... -Science-7

Last Answer : Option d) Iron and rust are the same substance. Iron and rust are different substances. Iron : Fe and Rust :

Which of the following statements is incorrect in the context of a worm? -Technology

Description : Which of the following statements is incorrect in the context of a worm? -Technology

Last Answer : (d) A worm is a self-replicating software and thus, it can travel on its own.

Two substances, A and B were made to react to form a third substance, A2B according to the following reaction 2A + B → A2 B. Which of the following statements concerning this reaction are incorrect? -Chemistry 9th

Description : Two substances, A and B were made to react to form a third substance, A2B according to the following reaction 2A + B → A2 B. Which of the following statements concerning this reaction are incorrect? -Chemistry 9th

Last Answer : (c) (i), (iii), (iv) Consider the example of H2O

Which of the following statements are not incorrect `:-` (i) Liver, the largest gland in our body secretes cholesterol, degrade steroid hormones, vita

Description : Which of the following statements are not incorrect `:-` (i) Liver, the largest gland in our body secretes cholesterol, degrade steroid hormones, vita

Last Answer : Which of the following statements are not incorrect `:-` (i) Liver, the largest gland in our body secretes ... I,ii,iv C. I only D. I,ii,iv

Which one of the following statements is incorrect

Description : Which one of the following statements is incorrect

Last Answer : Which one of the following statements is incorrect A. The residual air in lungs slightly ... flow facilitates efficient respiration in gills of fishes

Select the incorrect statements `:-` (a) alimentary canal begins with an anterior cavity called buccal cavity. (b) tooth is embeedded in a socket of m

Description : Select the incorrect statements `:-` (a) alimentary canal begins with an anterior cavity called buccal cavity. (b) tooth is embeedded in a socket of m

Last Answer : Select the incorrect statements `:-` (a) alimentary canal begins with an anterior cavity called buccal cavity. (b) tooth ... ,& c C. a,c,&d D. a,b &d

Select the incorrect statements

Description : Select the incorrect statements

Last Answer : Select the incorrect statements A. Natural selection is a heritable variation & by reproducting leave ... dry up in sun unlike those of Amphbians

Find out incorrect statements in relation to pollution

Description : Find out incorrect statements in relation to pollution

Last Answer : Find out incorrect statements in relation to pollution A. Plastic is nondegradable pollutant B. ... Ozone layer forms protective shield to ionosphere.

Which of the following are incorrect statements ?

Description : Which of the following are incorrect statements ?

Last Answer : Which of the following are incorrect statements ? A. Hardy schulz rule is related to coagulation ... more is the protective power of lyophillic sols.

From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements:

Description : From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements:

Last Answer : From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements: A. It can act only ... dark D. It has to be kept away from dust

Which of the following statements regarding sulphur is incorrect?

Description : Which of the following statements regarding sulphur is incorrect?

Last Answer : Which of the following statements regarding sulphur is incorrect? A. `S_(2)` molecule is paramagnetic ... is never less than +4 in its compounds

Which of the following is/are incorrect statements(s) for phosphine ?

Description : Which of the following is/are incorrect statements(s) for phosphine ?

Last Answer : Which of the following is/are incorrect statements(s) for phosphine ? A. It is less basic then ` ... burns in air forming predominantly `H_(3)PO_(4)`

A gas is obtained on heating ammonium nitrate. Which of the following statements are incorrect about this gas

Description : A gas is obtained on heating ammonium nitrate. Which of the following statements are incorrect about this gas

Last Answer : A gas is obtained on heating ammonium nitrate. Which of the following statements are incorrect about this ... acidic in nature D. is basic in nature

From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements:

Description : From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements:

Last Answer : From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements: A. It can act only ... dark D. It has to be kept away from dust

Which of the following statements regarding sulphur is incorrect?

Description : Which of the following statements regarding sulphur is incorrect?

Last Answer : Which of the following statements regarding sulphur is incorrect? A. `S_(2)` molecule is paramagnetic ... is never less than +4 in its compounds

Which of the following is/are incorrect statements(s) for phosphine ?

Description : Which of the following is/are incorrect statements(s) for phosphine ?

Last Answer : Which of the following is/are incorrect statements(s) for phosphine ? A. It is less basic then ` ... burns in air forming predominantly `H_(3)PO_(4)`

A gas is obtained on heating ammonium nitrate. Which of the following statements are incorrect about this gas

Description : A gas is obtained on heating ammonium nitrate. Which of the following statements are incorrect about this gas

Last Answer : A gas is obtained on heating ammonium nitrate. Which of the following statements are incorrect about this ... acidic in nature D. is basic in nature

Which one of the following statements regarding helium is incorrect?

Description : Which one of the following statements regarding helium is incorrect?

Last Answer : Which one of the following statements regarding helium is incorrect? A. (1) It is used to produce ... (4) It is used in gas-cooled nuclear reactors

Coordination compounds have great importance in biological systems. In this context which of the following statements is incorrect:

Description : Coordination compounds have great importance in biological systems. In this context which of the following statements is incorrect:

Last Answer : Coordination compounds have great importance in biological systems. In this context which of the ... green pigments in plants and contain calcium.

Read the following statements and find out the incorrect statement.

Description : Read the following statements and find out the incorrect statement.

Last Answer : Read the following statements and find out the incorrect statement. A. In organisms, exhibiting ... reduction in the number of eggs produced.

Which one of the following statements is incorrect regarding Bhopal gas tragedy ?

Description : Which one of the following statements is incorrect regarding Bhopal gas tragedy ?

Last Answer : Which one of the following statements is incorrect regarding Bhopal gas tragedy ? A. It took ... beings died D. Radioactive fall out engulfed Bhopal

Mark incorrect statements :- (A) Meiosis involves only a single cycle of DNA replication (B) Four haploid cells are formed at the end of meiosis-I ( C

Description : Mark incorrect statements :- (A) Meiosis involves only a single cycle of DNA replication (B) Four haploid cells are formed at the end of meiosis-I ( C

Last Answer : Mark incorrect statements :- (A) Meiosis involves only a single cycle of DNA replication (B) Four haploid ... and C C. Only B D. All are correct

Which one of the following statements for pyramid of energy is incorrect whereas remaining three are correct?

Description : Which one of the following statements for pyramid of energy is incorrect whereas remaining three are correct?

Last Answer : Which one of the following statements for pyramid of energy is incorrect whereas remaining three are ... organisms D. It is inverted in shape.

Which of the statements is incorrect w.r.t. melatonin hormone ?

Description : Which of the statements is incorrect w.r.t. melatonin hormone ?

Last Answer : Which of the statements is incorrect w.r.t. melatonin hormone ? A. Shows diumal variation B. ... C. Secreted by pineal body D. Poorly vascularized

Which of the following statements is incorrect ?

Description : Which of the following statements is incorrect ?

Last Answer : Which of the following statements is incorrect ? A. Pars intermedia atrophies during fetal ... D. Herring bodies are present in neurohypophysis.

Which of the following statements are incorrect regarding following reaction?

Description : Which of the following statements are incorrect regarding following reaction?

Last Answer : Which of the following statements are incorrect regarding following reaction? A. Product is ... is endocyclic alkene formed according to Hofmann

Which of the following statements is incorrect?

Description : Which of the following statements is incorrect?

Last Answer : Which of the following statements is incorrect? A. 2, 4,6 trimethy phenol is less acidic than ... chloro phenol is less acidic the para flouro phenol.

Among the following statements, the incorrect one is

Description : Among the following statements, the incorrect one is

Last Answer : Among the following statements, the incorrect one is A. cassiterite ore of tin contains the ... from Bessomer converter is called as blister copper.

Among the following statements, the incorrect one is

Description : Among the following statements, the incorrect one is

Last Answer : Among the following statements, the incorrect one is A. Calamine and siderite are carbonates B. ... D. Malachite and azurite are ores of copper

Which one of the following statements regarding helium is incorrect?

Description : Which one of the following statements regarding helium is incorrect?

Last Answer : Which one of the following statements regarding helium is incorrect? A. It is used to produce and ... D. It is used in gas-cooled nuclear reactors

Which of the following statements(s) is/are incorrect for `SF_(4)` molecule?

Description : Which of the following statements(s) is/are incorrect for `SF_(4)` molecule?

Last Answer : Which of the following statements(s) is/are incorrect for `SF_(4)` molecule? A. It has a ... the final product during the hydrolysis of `SF_(4)`

Which of the following statements are incorrect

Description : Which of the following statements are incorrect

Last Answer : Which of the following statements are incorrect A. `SO_(3)` is stronger oxidising agent and more acidic than ... the order `SO_(2)ltSeO_(2)ltTeO_(2)`

Which of the following statements regarding thiosulphate ion is incorrect

Description : Which of the following statements regarding thiosulphate ion is incorrect

Last Answer : Which of the following statements regarding thiosulphate ion is incorrect A. Shape of ... with iodine thisoulphate ion is tetrathionat ion

Which of the following statements regarding sulphur is incorrect?

Description : Which of the following statements regarding sulphur is incorrect?

Last Answer : Which of the following statements regarding sulphur is incorrect? A. `S_(2)` molecule is paramagnetic B. ... is never less than `+4` its compounds.