Enzymology MCQs | Enzymology Multiple Choice Questions and Answers

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Questions
1 Name an enzyme that digests fat?
A Fructose
B Sucrase
C Lipase
D Maltase

Answer: Lipase
2 Name an enzyme which is not proteinaceous in nature?
A Ribozyme
B Peptidiase
C Cellulases
D Xylanases

Answer: Ribozyme
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3 Inactive enzymes which are not bound to their cofactors are called
A Enzyme inhibitors
B Coenzymes
C Apoenzymes
D None of these

Answer: Apoenzymes
4 What is the nature of an enzyme?
A Protein
B Carbohydrate
C Vitamin
D None of these

Answer: Protein
5 What is an apoenzyme?
A It is a complete, biologically active conjugated enzyme
B It is a prosthetic group
C It is a protein portion of an enzyme
D It is a non-protein group

Answer: It is a protein portion of an enzyme
6 Which of this vitamin is associated with the coenzyme Biocytin?
A Biotin
B Pyridoxine
C Nicotinic acid
D None of these

Answer: Biotin
7 What is the function of phosphorylase?
A Use H2O2 as the electron acceptor
B Transfer amino group
C Transfer inorganic phosphate
D Transfer a carboxylate group

Answer: Transfer inorganic phosphate
8 Mark the CORRECT function of enzyme, Peptidase?
A Cleave amino bonds
B Removal of H2O
C Cleave phosphodiester bond
D Remove phosphate from a substrate

Answer: Cleave amino bonds
9 Which one of the following reactions used for the purpose of recycling enzymes in bioprocesses
A Immbolization
B Polymerization
C Isomerization
D Phosphorylation

Answer: Immbolization
10 Which one of the following techniques is not ideal for immobilized cell free enzymes?
A physical bonding by flocculation
B covalent surface bonding to surface carriers
C physical entrapment by encapsulation
D covalent chemical bonding by cross linking the precipitate

Answer: physical bonding by flocculation
11 Most industrial enzymes are obtained from
A Microbes
B Animal Tissues
C Plants
D Insects

Answer: Microbes
12 Enzymes, vitamins and hormones can be classified into a single category of biological chemicals because all of them
A Are proteins
B Enhance the oxidation metabolism
C Aid in regulating metabolism
D None of these

Answer: Are proteins
13 Digestive enzymes belong to the class:
A Hydrolases
B oxidoreductases
C Lysases
D None of these

Answer: Hydrolases
14 Enzymes synthesized in inactive form are called:
A proenzymes
B coenzymes
C Apoenzymes
D None of these

Answer: proenzymes
15 In competitive inhibition:
A Km is decreased and Vmax is increased
B Km is increased and Vmax is increased
C Km is decreased and Vmax is normal
D Km is increased and Vmax is normal

Answer: Km is increased and Vmax is normal
16 When substrate concentration is equal to Km value:
A Half of the enzyme molecules are bound to the substrate molecules and the other half are free
B maximum enzyme moleules are taking part in the reaction
C The reaction is now at equibrillium
D Maximum velocity is achieved

Answer: Half of the enzyme molecules are bound to the substrate molecules and the other half are free
17 The KM value of an enzyme is:
A The substrate concentration at half maximal velocity
B Dissociation constant of enzyme substrate complex
C the total enzyme concentration
D half the substrate concentration at maximal velocity

Answer: The substrate concentration at half maximal velocity
18 De novo synthesis of an enzyme, promoted by the substrate on which it acts, is characterised by the term
A Activation
B Gratuity
C Induction
D Derepression

Answer: Induction
19 The phenomenon by which the synthesis of a set of enzyme leading to a product from outside is known as
A Depression
B Repression
C Suppression
D None Of These

Answer: Repression
20 Enzyme papain is used with success to
A Tenderize meat
B Leaven bread
C Increase meat production
D Ripen papaya fruit

Answer: Tenderize meat

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