9th Biology Chapter 06 Enzymes Solved MCQs

Learn online solved MCQs of Enzymes Full chapter Biology class Ninth. All of these MCQs are helpful for preparations of Biology most Repeated Solved Questions With solved Answers.

Ninth Biology MCQs Solved Question Answers

Q.1: The that is needed to initiate chemical reaction that energy is called ........ energy?

1. Kinetic
2. Potential
3. Activation
4. None

C

Q.2: Number of discovered enzymes are?

1. 200
2. 2000
3. 3000
4. 3500

B

Q.1: Who used the term enzyme first time?

1. Oscar Hertwing
2. Winhelm kuhne
3. W-Flemming
4. T.H.Morgan

B

Q.3: Which of the following characters is not true about enzymes?

1. Globular in shape
2. Non-specific
3. Protein in nature
4. Highly reactive

B

Q.4: The first step in the cycle of an enzyme is?

1. Substrate binds to enzyme
2. Substrate converted
3. Products released
4. Enzyme become free

A

Q.5: What is True about enzymes?

1. They make biochemical reactions to proceed spontaneously
2. They lower the activation energy of a reaction
3. They are not very specific in their choice of substrates
4. They are needed in large quantities

B

Q.6: The average temperature for human is ..........°C?

1. 35°C
2. 36°C
3. 37°C
4. 38°C

C

Q.7: metabolism is the some of the .............. proesses?

1. Chemical
2. Physical
3. Both
4. None

A

Q.8: Enzymes accelerate reactions by-------the activation energy needed for the reaction?

1. Stopping
2. Raising
3. Lowering
4. Binding

C

Q.9: The bio-chemical reactions in which large molecules are synthesized is called?

1. Anabolism
2. Catabolism
3. Metabolism
4. Enzymatic reaction

A

Q.10: When we add more substrate to an already occurring enzymatic reaction and there is no increase in the rate of reaction what would you predict?

1. All active sites have been occupied by substrate molecules
2. The enzyme molecules have denatured
3. More substrate acted as inhibitor
4. More substrate has disturbed the pH of the medium

A

Q.11: Which enzyme works in stomach?

1. Lipase
2. Trypsin
3. Pepsin
4. Amylase

C

Q.12: Which one of the following convert lipids to fatty acids?

1. Protease
2. Lipase
3. Both
4. None

B

Q.13: All enzymes are composed of?

1. Lipids
2. Carbohydrates
3. Proteins
4. Phosphates

C

Q.14: Metabolism is of .......... types?

1. 1
2. 2
3. 3
4. 4

B

Q.15: Non-protein part of enzymes are?

1. Inhibitors
2. Substrate
3. Cofactors
4. Coenzymes

C

Q.16: Denaturation of enzyme is caused by?

1. Increased pH
2. Decreased pH
3. Increases in temperature above optimum temperature
4. Decreases in temperature

C

Q.17: Which one of the following convert protein to amino acids?

1. Protease
2. Lipase
3. Both
4. None

A

Q.18: Enzymes are made up of ........... ?

1. protein
2. Carbohydrates
3. Lipids
4. Triglyceride

A

Q.19: Lock and key model was proposed by?

1. Emil Fischer
2. Melcher
3. Koshland
4. Saugeo

A

Q.20: Activation energy is required to?

1. Activation enzyme
2. Start a reaction
3. Speed up a reaction
4. None

B

Q.21: Beriberi can be produced by the lack of ...... ?

1. Vitamin A
2. Vitamin B
3. Vitamin BI
4. Vitamin C

C

Q.22: Enzymatic reactions are ------- of times faster than uncatalyzed reactions?

1. Millions
2. Hundreds
3. Thousands
4. Billion

A

Q.23: To what category of molecules do enzymes belong?

1. Carbohydrates
2. Lipids
3. Nucleic acids
4. Proteins

D

Q.24: An enzyme, which breaks down starch is?

1. Protease
2. Amylase
3. Tripsn
4. Lipase

B

Q.25: Prosthetic by all enzymes ?

1. Required by all enzymes
2. Loosely attached with enzymes
3. Proteins In nature
4. Tightly bound to enzyme

D

Q.26: The enzyme function between a PH of .............. ?

1. 2 to 4
2. 6 to 8
3. 8 to 10
4. 1 to 2

B

Q.27: Trypsin works at the PH of?

1. 2
2. 4
3. 8
4. 6

C

Q.28: which enzyme converts lipids into fatty acid and glycerol?

1. Lipase
2. Amylase
3. Pepsin
4. Trypsin

A

Q.29: Prosthetic groups are?

1. Required by all enzymes
2. Loosely attached with enzymes
3. Proteins in nature
4. Tightly bound to enzyme

D

Q.30: When an enzyme is no longer able to work, it is said to be?

1. Catalyzed
2. Dead
3. Cofactored
4. Denatured

D

Q.31: The substance on which an enzyme act is called?

1. Cofactor
2. Inhabitor
3. Coenzyme
4. Substrate

D

Q.32: Catabolism constitutes .............. processes?

1. Constructive
2. Destructive
3. Both a & b
4. None

B

Q.33: What is true about cofactors?

1. Break hydrogen bonds in proteins
2. Help facilitate enzyme activity
3. Increase activation energy
4. Are composed of proteins

B

Q.34: Lock and key model was proposed by .............. ?

1. Emil Fisher
2. Koshland
3. Freitz London
4. None

A

Q.35: Pepsin works at the PH of .......... ?

1. 1
2. 2
3. 3
4. 4

B

Q.36: Which one of the following is specific in action ?

1. Catalyst
2. Enzyme
3. Both
4. None

B

Q.37: Which enzyme breaks the peptide bods?

1. Amylase
2. Protease
3. Lipase
4. None

B

Q.38: The molecule that fits the active sites that is called?

1. Substrate
2. Enzyme
3. Catalyst
4. All

A

Q.39: When we add more substrate to an already occurring enzymatic reaction and there is no increase in the rate of reaction, what would you predict?

1. All active site have been occupied by substrate molecules
2. The enzyme molecule have denatured
3. More substrate acted as inhibitor
4. More substrate has disturbed the pH of the medium

A

Q.40: Coenzymes are small .............. molecules?

1. Organic
2. Inorganic
3. Both
4. None

A

Q.41: The building units of enzymes are?

1. Fatty acids
2. Glycerol
3. Nucleic acid
4. Amino acid

D

Q.42: Anabolism constitute ............. processes?

1. Construction
2. Destruction
3. Both a & b
4. None

A

Q.43: There are about ........... to ...... enzymes in cell?

1. 1000-2000
2. 1000-2050
3. 2000-6000
4. 2000-3000

D

Q.44: Minimum energy required to start a chemical reaction is called?

1. Potential energy
2. Chemical energy
3. Activation energy
4. All are same

C

Q.45: The optimum temperature for human enzyme is between?

1. 10-20°C
2. 20-35°C
3. 35-40°C
4. 5-10°C

C

Q.46: To waht category of molecules do enzymes belong?

1. Carbohydrates
2. Lipids
3. Nucleic acids
4. Proteins

D

Q.47: Enzymes are ........... catalysts?

1. Inorganic
2. Organic
3. Both a & b
4. None

B

Q.48: What is the effect of change in pH?

1. Digradation of amino acids at active sites
2. Ionization of amino acids at active sites
3. Formation of new amino acids at active sites
4. All of these

B

Q.49: Almost all enzymes are?

1. Carbohydrates
2. Fatty acids
3. Proteins
4. Vitamins

C

Q.50: Which of the following variable is least likely to affect an enzymes rate of reaction?

1. Temperature
2. pH
3. Carbon dioxide concentration
4. Enzyme concentration

C

Q.51: Induced Fit model was proposed by?

1. Emil Fischer
2. Melcher
3. Koshland
4. Saugeo

A

Q.52: When we add more substrate to an already occuring enzymatic reaction and there is no increase in the rate of reaction, what would you predict?

1. All actives sites have been occupied by substrate molecules
2. The enzyme molecule have denatured
3. More substrate acted as inhibitor
4. More substrate has disturbed has disturbed the pH of the medium

A

Q.53: Vitamin which acts as co-enzyme is?

1. Vitamin A
2. Vitamin K
3. Riboflavin
4. All of these

C

Q.54: Optimum temperature for enzymes of human body is?

1. 86°C
2. 37°C
3. 38°C
4. 39°C

B