2-An activated enzyme made of polypeptide chain and a co-factor is (A) Coenzyme (B) Substrate (C) Apoenzyme (D) Holoenzyme
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1 1-The catalytic activity of an enzyme is restricted to its small portion called (B) Passive site (C) Allosteric site (D) All Choices are correct 2-An activated enzyme made of polypeptide chain and a co-factor is (A) Coenzyme (B) Substrate (C) Apoenzyme (D) Holoenzyme 3- Enzymes are largely in their chemical nature. (A) Lipids (B) Steroids (C) Protein (D) All A, B and C 4- In human body the optimum temperature for enzymatic activities is (A) 37 o C (B) 40 o C (C) 25 o C (D) 30 o C 5- Optimum ph value for pepsin is (A) (B) (C) (D) Competitive inhibitors stop an enzyme from working by (A) Changing the shape of the enzyme (B) merging with the substrate instead (C) blocking the active site of the enzyme in a reversible manner (D) combining with the product of the reaction 7-The enzymes are sensitive to (A) Changes in ph (B) Changes in temperature (C) Both A and B
2 8- Enzyme B requires Zn2+ in order to catalyze the conversion of substrate X. The zinc is best identified as a(n): (A) Coenzyme (B) Activator (C) Substrate (D) Product 9-The enzyme minus its coenzyme is referred to as the (A) Iso-enzyme (B) Metalloenzyme (C) Apoenzyme 10-The lock and key model of enzyme action illustrates that a particular enzyme molecule (A) forms a permanent enzyme-substrate complex (B) may be destroyed and resynthesized several times (C) interacts with a specific type of substrate molecule which is complementary to its shape (D) reacts at identical rates under all conditions 11- An inhibitor that changes the overall shape and chemistry of an enzyme is known as a(n) (A) quantity regulator (B) Competitive inhibitor (C) quality regulator (D) Noncompetitive inhibitor 12- Non-protein components of enzymes are known as (A) Coenzymes (B) Activators (C) Cofactors (D) All A, B, and C 13- The reaction that occurs within the cells to prevent the accumulation of hydrogen peroxide. In this reaction, catalase functions as an (A) Enzyme in the breakdown of hydrogen peroxide (B) Enzyme in the synthesis of hydrogen peroxide (C) enzyme in the digestion of hydrogen peroxide (D) Indicator in the detection of hydrogen peroxide
3 14-An enzyme is generally named by adding to the end of the name of the. (A) "-ase". coenzyme (B) "-ase". cell in which it is found (C) "-ose". substrate. (D) "-ase". substrate 15-The minimum amount of energy needed for a process to occur is called the (A) Minimal energy theory (B) Process energy (C) Kinetic energy (D) Activation energy 16- Enzymes function as (A) Organic catalysts (B) Inorganic catalysts (C) Inhibitors 17-Many enzymes function by the activation energy of reactions. (A) Increasing (B) Promoting (C) Lowering (D) Both A and B 18-An uncatalysed reaction requires a (A) Higher activation energy (B) Lower activation energy (C) Balanced activation energy 19-They are non-protein organic molecules bound to enzymes near the active site. (A) Activators (B) Coenzymes (C) Holoenzymes 20-The first step in any reaction catalysed by an enzyme is the formation of a specific association between the molecules called an (A) Enzyme-product complex (B) Enzyme-intermediate complex (C) Enzyme-substrate complex
4 21-The mechanism of competitive inhibitors is defined by their ability to interact or bind to (A) The active site of an enzyme (B) Regulatory sub-units of an enzyme (C) Non-competitive inhibitor (D) Enzyme cofactors 22-During the final product of a metabolic pathway turn off the first step of metabolic pathway. (A) Positive feed back (B) Negative feed back (C) Competitive feed back (D) Both A and C 23- occurs when the inhibitory chemical, which has no similarity to the substrate, binds to the enzyme other than at the active site. (A) Noncompetitive Inhibition (B) Competitive Inhibition (C) Uncatalysed reaction (D) All A, B and C 24-Which one is not attribute of enzyme (A) Specific in nature (B) Protein in chemistry (C) Consumed in reaction (D) Increases rate of reaction 25-Which one inactivates an enzyme by indirectly changing the shape of the active site of an enzyme (A) Non-competitive inhibitor (B) Competitive inhibitor (C) Coenzyme (D) Activator 26-Non-protein part of holoenzyme is (A) Prosthetic group (B) Apoenzyme (C) Tubulin
5 27-Enymes are highly specific for a given substrate which is due to the shape of their (B) Allosteric site (C) Non-competitive site 28- An enzyme that hydrolyzes protein will not act upon starch. This fact is an indication that enzymes are (A) hydrolytic (B) specific (C) catalytic (D) synthetic 29-The site where enzyme catalyzed reaction takes place is called? (B) Allosteric site (C) Denatures site (D) Dead Site 30-What is a cofactor? (A) Inorganic ions (B) Organic molecules (C) Both a and b (D) None of the above 31-At high temperature the rate of enzyme action decreases because the increased heat (A) Changes the ph of the system (B) Alters the active site of the enzyme up to dentauration (C) Neutralize acids and bases in the system (D) Increases the concentration of enzymes 32-Which of the following enzymes would digest a fat? (A) sucrase (B) protease (C) Ligase (D) lipase
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