# All coenzymes are derived from?
A - Proteins
B - Vitamins
C - Carbohydrates
D - Metal ions
# If enzyme concentration is continuously increased, what is the effect on the rate of reaction?
A - It increases continuously.
B - There is no increase in the rate of reaction.
C - It increases to a certain level after that it will remain constant.
D - It increases to a certain level after that it decreases.
# If detachable co-factor is an inorganic ion then it is designated as:
A - Co enzyme
B - Prosthetic group
C - Activator
D - Holoenzyme
# Which molecular structure of enzyme is essential for activity of enzyme?
A - Quaternary structure
B - Primary structure
C - Secondary structure
D - Tertiary structure
# Active site of an enzyme has how many definite regions?
A - 2
B - 3
C - 4
D - 5
# Doubling the enzyme concentration has what effect on the rate of reaction?
A - Rate of reaction remains same.
B - Rate of reaction doubles.
C - Rate of reaction increase by three times.
D - Rate of reaction increase by four times.
# Enzymes are primarily:
A - Proteins
B - Lipids
C - Carbohydrates
D - None of the above
# Some enzymes require a non protein part for its efficient functioning. This helper non protein part is called :
A - Accelerator
B - Cofactor
C - Prosthetic group
D - Apoenzyme
# The enzymes which act as molecular scissors in recombinant technology are :
A - Exonucleases
B - Endonucleases
C - Polymerases
D - All of the above
# An enzyme and substrate reacts through a special feature or site present on enzyme known as ?
A - Building site
B - Catalytic site
C - Active site
D - Inhibition site
# What is the effect of the increase in the substrate concentration on the enzymatic reaction?
A - It increases the rate of reaction.
B - It decreases the rate of reaction.
C - It has no effect on the rate of reaction.
D - It increases the rate of reaction but up to a certain limit.
# The inhibitors that bind tightly and permanently to enzymes and destroy their globular structure and catalytic activity are:
A - Irreversible inhibitors
B - Reversible inhibitors
C - Competitive inhibitors
D - Non-competitive inhibitors
# The type of inhibition in which inhibitors has no structural similarity to substrate and combines with enzyme at other than the active site are called?
A - Irreversible inhibitors
B - Reversible inhibitors
C - Competitive inhibitors
D - Non competitive inhibitors
# Co-factors have which of the following function?
A - Provide a source of chemical energy.
B - Act as a bridge between the enzyme and the substrate.
C - Contributes directly to the chemical reaction.
D - All of the above.
# The competitive inhibitors have structural similarity with?
A - Activator
B - Co-enzyme
C - Prosthetic group
D - Apo-enzyme
# Who proposed the Lock and Key model to visualize the enzyme substrate interaction?
A - Koshland
B - Emil Fischer
C - Meldeev
D - Robert Fisk
# Non-protein part of the enzyme which is essential for the proper functioning of the enzyme is called?
A - Active site
B - Passive site
C - Coenzyme
D - Cofactor
# The view that active site of an enzyme is flexible and when a substrate combines with it, cause changes in enzyme structure is known as:
A - Lock and key model
B - Induce fit model
C - Sliding filament model
D - Specificity model
# The non protein part of enzyme which is covalently and permanently bound is called ?
A - Prosthetic group
B - Co factor
C - Co enzyme
D - Activator
# An enzyme with its prosthetic group removed is called?
A - Co-enzyme
B - Holoenzyme
C - Apoenzyme
D - Activator
# In which of the following cases, the enzyme shall not perform its function?
A - Enzyme missing its co-factor.
B - Apoenzyme
C - Non-availability of activator.
D - All of the above.
# Pepsin is produced in an inactive pepsinogen form because?
A - This is the only possible way to produce it.
B - It is not required to work in the early stages of its life.
C - It is less energy intensive to produce pepsinogen than pepsin.
D - It does not digest the internal organ cells.
# Which of the following statement defines the activator in an enzyme?
A - An inorganic detachable co-factor.
B - An organic detachable co-factor.
C - An inorganic permanent co-factor.
D - An organic permanent co-factor.
# Enzymatic reactions are most sensitive to which of the following?
A - Concentration of enzyme.
B - Concentration of substrate.
C - pH
D - Temperature
# Which of the following describes the prosthetic group in an enzyme?
A - A detachable inorganic co-factor.
B - A detachable organic co-factor.
C - Tightly bound co-enzymes.
D - Loosely bound co-enzymes.
# What is the main deviation of induced fit model from the lock and key model?
A - Induced fit model proposed that enzymes active site is a rigid structure.
B - Induced fit model proposed that the activation site is much small than the one proposed by the lock and fit model.
C - Induced fit model proposed that the substrate can change the structure of the enzyme.
D - All of the above.
# If the cofactor is covalently bonded to enzyme then it will be called:
A - Prosthetic group
B - Coenzyme
C - Activator
D - Apoenzyme
# What is the optimum pH for enzyme Pepsin?
A - 1.00
B - 2.00
C - 4.50
D - 5.50
# Which of the following form a weak linkage with the enzyme?
A - Cofactor.
B - Prosthetic group.
C - Reversible inhibitor.
D - Irreversible inhibitor.
# What is the main property of non-competitive inhibitors?
A - They do not reduce the rate of enzyme reaction.
B - They form the enzyme inhibitor complex at the site other than the active site.
C - They form the enzyme inhibitor complex on the active site.
D - They are always protein in nature.
# Optimum pH value for working of pancreatic lipase is:
A - 4.5
B - 7.6
C - 9.0
D - 2.0
# Enzyme succinate dehydrogenase coverts succinate into:
A - Malate
B - Malonic Acid
C - Fumarate
D - Citrate
# Some enzymes require the presence of a non-protein molecule to behave catalytically. An enzymes devoid of this molecule is called a(n)
A - Holo enzyme
B - Apo enzyme
C - Co enzyme
D - Zymo enzyme
# Which of the following statement regarding enzymes is NOT true?
A - Some enzymes have metal ions as co-factors.
B - Enzymes are compounds of hundreds of amino acids.
C - Enzymes have globular structure.
D - Enzymes alter the nature and properties of end products.
# A cofactor tightly bound to the enzyme on permanent basis is called :
A - Activator
B - Co-enzyme
C - Prosthetic group
D - Apo-enzyme
# What is the main effect of the inhibitors on the enzyme catalytic activity?
A - They enhance the speed of reaction.
B - They increase the availability of active sites on the enzyme.
C - They reduce the reaction rate.
D - None of the above.
# Optimum temperature for most of the human enzymes is?
A - 37 degree centigrade
B - 41 degree centigrade
C - 45 degree centigrade
D - 25 degree centigrade
# Enzymes catalytic activity is limited to a small portion called?
A - Co-factor
B - Coenzyme
C - Active site
D - Passive site
# Enzymes increase the rate of reaction by ?
A - Increasing temperature
B - Decreasing pH
C - Decreasing activation energy
D - Increasing activation energy
# Which one of the following is a competitive inhibitor?
A - Fumarate
B - Glucose
C - Succinic acid
D - Malonate
# Which of the following comprises of inorganic ions?
A - Coenzymes
B - Activators
C - Prosthetic group
D - Apoenzyme
# All coenzymes are derived from:
A - Proteins
B - Nucleic acid
C - Vitamins
D - Carbohydrates
# All enzymes are _______
A - Fibrous proteins
B - Low molecular weight proteins
C - Lipoproteins
D - Globular proteins
# The reactants on which enzymes work are:
A - Products
B - Metabolites
C - Substrates
D - Catabolites
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