1-Most important group of proteins which r biologically active are
A-harmoglobin
B-enzymes
C-inhibitors
D-both b and c
2- where does the catalytic activity takes place in enzyme
A-binding site
B-catalytic site
C-active site
D-globular site
3-in there action enzymes r very
A-general
B-precise
C-specific
D-exact
4-the non protein part essential for its proper funtioning
A-activator
B-co-enzyme
C-co-factor
D-prosthetic group
5-what acts as a bridge b/w enzyme &. its sybstrate
A-active site
B-globular shape of enzyme
C-co-factor
D-both a & c
6-the detachable inorganic part of enzyme
A-prosthetic group
B-co-enzyme
C-activitor
D-co-factor
7-enzymes important in photosynthesis n cellular respiration are found in
A-mithochondria & chromoplast
B-cell wall & cell membrane
C-chloroplast & mithochondria
D-E.R & golgi bodies
8-which statement about enzyme is not true
A-they consists of protein with or without a non-protein part
B-they changed the rate of catalytic reaction
c-they r sensitive to heat
D-they increases the activation energy
9-the active site of an enzyme
A-never changes
B-forms no chemical bonds with substrate
C-determines,by its structure the specificity of enzyme
D-looks like a lump projecting from the surface of enzyme
10-the rate of an enzyme catalysed reaction
A-is constant under all conditions
B-decreases as substrate concentration increases
C-cannot be measured
D-can be reduced by inhibitors
Q:11: The enzyme minus its coenzyme is referred to as the
(A) Iso-enzyme
(B) Metalloenzyme
(C) Apoenzyme
(D) All of these
Q:12: 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
(D) reacts at identical rates under all conditions
Q:13: A catalyst is a chemical involved in, but not ____________ by, a chemical reaction.
(A) Supported
(B) Changed
(C) Controlled
(D) All of these
Q:14: An inhibitor that changes the overall shape and chemistry of an enzyme is known as a(n)
(A) Auto-steric inhibitor
(B) Competitive inhibitor
(C) Steric inhibitor
(D) Noncompetitive inhibitor
Q:15: Non-protein components of enzymes are known as
(A) Coenzymes
(B) Activators
(C) Cofactors
(D) All A, B, and C
Q:16: 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
Q:17: 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
Q:18: A student conducts an experiment to test the efficiency of a certain enzyme. Which would probably not result in a change in the enzyme's efficiency?
(A) Adding an acidic solution to the setup
(B) Adding more substrate but not enzyme
(C) Increasing temperature of solution
(D)All a, b, & c change enzyme's efficiency
Q:19: Enzymes function as
(A) Organic catalysts
(B) Inorganic catalysts
(C) Inhibitors
(D) All of these
Q:20: A catalyst is a chemical involved in, but not ____________ by, a chemical reaction.
(A) Supported
(B) Changed
(C) Controlled
(D) All of these
Q:21: An activated enzyme made of polypeptide chain and a co-factor is
(A) Coenzyme
(B) Substrate
(C) Apoenzyme
(D) Holoenzyme
Q:22: Koshland in 1959 proposed
(A) Fluid mosaic model
(B) Induce fit model
(C) Lock and key model
(D) Reflective index model
Q:23: Enzymes are largely _________________________ in their chemical nature.
(A) Lipids
(B) Steroids
(C) Proteinaceous
(D) All A, B and C
Q:24: Who proposed “lock and key” model to study enzyme – substrate interaction?
(A) Koshland (1959)
(B) Wilhelm Kuhne (1878)
(C) Fischer (1890)
(D) None of these
Q:25: Many enzymes function by __________________ the activation energy of reactions.
(A) Increasing
(B) Promoting
(C) Lowering
(D) Both A and B
Q:26: An uncatalysed reaction requires a
(A) Higher activation energy
(B) Lower activation energy
(C) Balanced activation energy
(D) All of these
Q:27: 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
(D) None of these
Q:28: The function 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
Q:29: If an enzyme solution is saturated with substrate, the most effective way to obtain an even faster yield of products would be
(A) Add more of the enzymes
(B) Add more substrate
(C) Add an allosteric inhibitor
(D) Add a non-competitive inhibitor
Q:30: _____________ occurs when the inhibitory chemical, which does not have to resemble 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
Q:31: Enymes are highly specific for a given substrate which is due to the shape of their
(A) Active site
(B) Allosteric site
(C) Non-competitive site
(D) None of these
Q:32: Proteinaceous part of holoenzyme is
(A) Prosthetic group
(B) Apoenzyme
(C) Lecithin
(D) None of these
Q:33: The "lock and key hypothesis" attempts to explain the mechanism of
(A) vacuole formation
(B) pinocytosis
(C) sharing of electrons
(D) enzyme specificity
Q:34: 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
Q:35: The site where enzyme catalyzed reaction takes place is called?
(A) Active site
(B) Allosteric site
(C) Denatures site
(D) Dead Site
Q:36: What is a cofactor?
(A) Inorganic ions
(B) Organic molecules
(C) Both a and b
(D) None of the above
Q:37: 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
(C) Neutralize acids and bases in the system
(D) Increases the concentration of enzymes
Q:38: Which of the following enzymes would digest a fat?
(A) sucrase
(B) protease
(C) Ligase
(D) lipase
Q:39: In the Lock and Key model of enzyme action, the part of the enzyme that recognizes the substrate is known as the
(A) Enzyme-substrate complex
(B) Product
(C) Enzyme-product complex
(D) Active site
Q:40: Which one is not attribute of enzyme
(A) Specific in nature
(B) Protein in chemistry
(C) Consumed in reaction
(D) Increases rate of reaction
Correct ans=B,C,C,C,C,C,C,D,C,D,C,C,B,D,D,D,D,D,A,B,D,B,C,C,C,A,C,A,A,A,A,B,D,B,A,C,B,D,D,c
A-harmoglobin
B-enzymes
C-inhibitors
D-both b and c
2- where does the catalytic activity takes place in enzyme
A-binding site
B-catalytic site
C-active site
D-globular site
3-in there action enzymes r very
A-general
B-precise
C-specific
D-exact
4-the non protein part essential for its proper funtioning
A-activator
B-co-enzyme
C-co-factor
D-prosthetic group
5-what acts as a bridge b/w enzyme &. its sybstrate
A-active site
B-globular shape of enzyme
C-co-factor
D-both a & c
6-the detachable inorganic part of enzyme
A-prosthetic group
B-co-enzyme
C-activitor
D-co-factor
7-enzymes important in photosynthesis n cellular respiration are found in
A-mithochondria & chromoplast
B-cell wall & cell membrane
C-chloroplast & mithochondria
D-E.R & golgi bodies
8-which statement about enzyme is not true
A-they consists of protein with or without a non-protein part
B-they changed the rate of catalytic reaction
c-they r sensitive to heat
D-they increases the activation energy
9-the active site of an enzyme
A-never changes
B-forms no chemical bonds with substrate
C-determines,by its structure the specificity of enzyme
D-looks like a lump projecting from the surface of enzyme
10-the rate of an enzyme catalysed reaction
A-is constant under all conditions
B-decreases as substrate concentration increases
C-cannot be measured
D-can be reduced by inhibitors
Q:11: The enzyme minus its coenzyme is referred to as the
(A) Iso-enzyme
(B) Metalloenzyme
(C) Apoenzyme
(D) All of these
Q:12: 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
(D) reacts at identical rates under all conditions
Q:13: A catalyst is a chemical involved in, but not ____________ by, a chemical reaction.
(A) Supported
(B) Changed
(C) Controlled
(D) All of these
Q:14: An inhibitor that changes the overall shape and chemistry of an enzyme is known as a(n)
(A) Auto-steric inhibitor
(B) Competitive inhibitor
(C) Steric inhibitor
(D) Noncompetitive inhibitor
Q:15: Non-protein components of enzymes are known as
(A) Coenzymes
(B) Activators
(C) Cofactors
(D) All A, B, and C
Q:16: 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
Q:17: 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
Q:18: A student conducts an experiment to test the efficiency of a certain enzyme. Which would probably not result in a change in the enzyme's efficiency?
(A) Adding an acidic solution to the setup
(B) Adding more substrate but not enzyme
(C) Increasing temperature of solution
(D)All a, b, & c change enzyme's efficiency
Q:19: Enzymes function as
(A) Organic catalysts
(B) Inorganic catalysts
(C) Inhibitors
(D) All of these
Q:20: A catalyst is a chemical involved in, but not ____________ by, a chemical reaction.
(A) Supported
(B) Changed
(C) Controlled
(D) All of these
Q:21: An activated enzyme made of polypeptide chain and a co-factor is
(A) Coenzyme
(B) Substrate
(C) Apoenzyme
(D) Holoenzyme
Q:22: Koshland in 1959 proposed
(A) Fluid mosaic model
(B) Induce fit model
(C) Lock and key model
(D) Reflective index model
Q:23: Enzymes are largely _________________________ in their chemical nature.
(A) Lipids
(B) Steroids
(C) Proteinaceous
(D) All A, B and C
Q:24: Who proposed “lock and key” model to study enzyme – substrate interaction?
(A) Koshland (1959)
(B) Wilhelm Kuhne (1878)
(C) Fischer (1890)
(D) None of these
Q:25: Many enzymes function by __________________ the activation energy of reactions.
(A) Increasing
(B) Promoting
(C) Lowering
(D) Both A and B
Q:26: An uncatalysed reaction requires a
(A) Higher activation energy
(B) Lower activation energy
(C) Balanced activation energy
(D) All of these
Q:27: 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
(D) None of these
Q:28: The function 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
Q:29: If an enzyme solution is saturated with substrate, the most effective way to obtain an even faster yield of products would be
(A) Add more of the enzymes
(B) Add more substrate
(C) Add an allosteric inhibitor
(D) Add a non-competitive inhibitor
Q:30: _____________ occurs when the inhibitory chemical, which does not have to resemble 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
Q:31: Enymes are highly specific for a given substrate which is due to the shape of their
(A) Active site
(B) Allosteric site
(C) Non-competitive site
(D) None of these
Q:32: Proteinaceous part of holoenzyme is
(A) Prosthetic group
(B) Apoenzyme
(C) Lecithin
(D) None of these
Q:33: The "lock and key hypothesis" attempts to explain the mechanism of
(A) vacuole formation
(B) pinocytosis
(C) sharing of electrons
(D) enzyme specificity
Q:34: 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
Q:35: The site where enzyme catalyzed reaction takes place is called?
(A) Active site
(B) Allosteric site
(C) Denatures site
(D) Dead Site
Q:36: What is a cofactor?
(A) Inorganic ions
(B) Organic molecules
(C) Both a and b
(D) None of the above
Q:37: 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
(C) Neutralize acids and bases in the system
(D) Increases the concentration of enzymes
Q:38: Which of the following enzymes would digest a fat?
(A) sucrase
(B) protease
(C) Ligase
(D) lipase
Q:39: In the Lock and Key model of enzyme action, the part of the enzyme that recognizes the substrate is known as the
(A) Enzyme-substrate complex
(B) Product
(C) Enzyme-product complex
(D) Active site
Q:40: Which one is not attribute of enzyme
(A) Specific in nature
(B) Protein in chemistry
(C) Consumed in reaction
(D) Increases rate of reaction
Correct ans=B,C,C,C,C,C,C,D,C,D,C,C,B,D,D,D,D,D,A,B,D,B,C,C,C,A,C,A,A,A,A,B,D,B,A,C,B,D,D,c
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