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Enzyme catalysis



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Q1. What is the nature of an enzyme?

(a) Vitamin
(b) Lipid
(c) Carbohydrate
(d) Protein

Q2. Enzyme increases the rate of reaction by lowering the activation energy.

(a) True
(b) False
(c) Both acidolysis and aldehyde
(d) None of the mentioned

Q3. A __________is a biocatalyst that increases the rate of the reaction without being changed.

(a) Aluminum oxide
(b) Silicon dioxide
(c) Enzyme
(d) Hydrogen peroxide

Q4. Which of the following is not true for covalent catalysis?

(a) A number of coenzymes for covalent adducts generating new electrophilic groups which can function as electron sink
(b) These adduct forming coenzymes leads to increase in rate acceleration
(c) About 100 enzymes show covalent intermediates during catalysis
(d) Hydrolysis of acetyl imidazole is an example of this type of catalysis

Q5. Which of the following is not involved in covalent catalysis?

(a) Bases which catalyze the reaction by accepting a proton
(b) Electron rich nucleophilic function group of amino acid side chain
(c) Electron deficient electrophilic portion of substrate
(d) Acylated, phosphorylated or glycosylated enzyme nucleophile as covalent intermediate

Q6. Which of the following statement is not true for catalysis by approximation?

(a) Change in conformation 3D structure of protein from low activity form to high activity form
(b) To make reactants proximal to each other
(c) This proximity raises effective concentration over that of the reactants free in solution and lead to rate acceleration
(d) To quantify some proximity effects, model studies were carried out

Q7. Which of the following is not true for strain distortion and conformational change?

(a) Change in conformation 3D structure of a protein from low activity form to high activity form
(b) To make reactants proximal to each other
(c) Intrinsic interaction energy and geometric distortions are involved
(d) ES complex is selectively destabilized

Q8. Which of the following is not true for strain distortion and conformational change?

(a) Bases increases the reaction rate by increasing the nucleophilic character of the attacking group
(b) The strain in the starting material and release of that strain provides rate acceleration in chemical reactions
(c) This experiment was carried out by Westheimer and his colleagues
(d) Rate of hydrolysis of phosphate esters in two compounds was explained by this theory

Q9. Which of the following is not true for acid base catalysis?

(a) Bases catalyze the reaction by accepting a proton
(b) Bases increases the reaction rate by increasing the nucleophilic character of the attacking group
(c) To make reactants proximal to each other
(d) Specific hydroxide ion catalysis of reaction in water is an example of this type of catalysis

Q10. ___________ catalyze the reaction by accepting a proton.

(a) Acid
(b) Entrapment
(c) Enzyme
(d) Bases


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242 Year Ago

0.2 Gm Of Fine Animal Charcoal Is Mixed With Half Litre Of Acetic

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Modified 5 Year Ago

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In The Case Of Small Cuts, Bleeding Is Stopped By Applying Potash Alum. Here Alum Acts As

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0 Answer
314 views

Activated Charcoal Is Used To Remove Colouring Matter From Pure Substances. It Works By

Modified 5 Year Ago

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Activated Charcoal Is Used To Remove Colouring Matter From Pure Substances. It Works By

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0 Answer
309 views

In The Adsorption Of A Gas On Solid, Freundlich Isotherm Is Obeyed. The Slope Of The Plot Is Zero. Then The Extent Of Adsorption Is

Modified 242 Year Ago

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242 Year Ago

In The Adsorption Of A Gas On Solid, Freundlich Isotherm Is Obeyed. The Slope Of The Plot Is Zero. Then The Extent Of Adsorption Is

0 votes
0 Answer
308 views

The Decomposition Of Hydrogen Peroxide Can Be Slowed By The Addition Of Acetamide. The Latter Acts As A

Modified 5 Year Ago

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The Decomposition Of Hydrogen Peroxide Can Be Slowed By The Addition Of Acetamide. The Latter Acts As A

0 votes
0 Answer
305 views

In Freundlich Adsorption Isotherm, The Value Of 1/n Is

Modified 242 Year Ago

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