Physical digestion means the

mechanical breakdown of food into smaller pieces

Carbon dioxide (CO₂) and water (H₂O) are produced as output when

oxidation does not occur at all

oxidation is accompanied with cell division

oxidation is accompanied with water

Tryprotophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consist of

two proteins designated A and B

Which of the following statements about enzymes or their function is true?

Enzymes speed up reactions by lowering activation energy

Enzymes are proteins whose three-dimensional form is key to their function

Enzymes do not alter the overall change in free energy for a reaction

Enzymes speed up reactions by lowering activation energy

The role of Asp 102 and His 57 during trypsin catalysis is to

. keep the specificity pocket open

neutralize the charge on the other's side chain

clamp the substrate into the active site

167 + Mcqs in Enzymes in Life Sciences Page 3 McqOptions

101.	Physical digestion means the
A.	mechanical breakup of food
B.	cellular breakup of food
C.	chewing up of food
D.	mechanical breakdown of food into smaller pieces
Answer» E.

Discussion

102.	Plants do not produce
A.	cellulose
B.	lignin
C.	fats
D.	amylase
Answer» E.

Discussion

103.	Conversion of hydrogen peroxide (H₂O₂) to water (H₂O) and oxygen (O₂) is carried out by
A.	catalysis
B.	catalase
C.	bile
D.	fructose
Answer» C. bile

Discussion

104.	Lipids are a form of
A.	carbohydrates
B.	proteins
C.	fats
D.	minerals
Answer» D. minerals

Discussion

105.	In mammals, catalase is common in
A.	liver only
B.	blood only
C.	pancreas
D.	liver and blood
Answer» E.

Discussion

106.	All are wrong about Hydrogen peroxide (H₂O₂), but
A.	helps line up cell proteins
B.	poisonous to tissues
C.	often needed as a catalyst
D.	aids in oxidation of glucose
Answer» C. often needed as a catalyst

Discussion

107.	Carbon dioxide (CO₂) and water (H₂O) are produced as output when
A.	oxidation of glucose occurs
B.	oxidation does not occur at all
C.	oxidation is accompanied with cell division
D.	oxidation is accompanied with water
Answer» B. oxidation does not occur at all

Discussion

108.	Digestive enzymes are used in
A.	house paints
B.	washing powder
C.	dying fabrics
D.	car wash
Answer» C. dying fabrics

Discussion

109.	Proteases is commonly found in
A.	pineapple
B.	pomegranate
C.	papaya
D.	paprika
Answer» D. paprika

Discussion

110.	While cutting big molecules to smaller molecules, enzymes may be called as
A.	molecular knife
B.	molecular lancet
C.	molecular fork
D.	molecular scissors
Answer» E.

Discussion

111.	Non-protein part of an enzyme is called
A.	co-enzyme
B.	co-factor
C.	substrate
D.	activator
Answer» C. substrate

Discussion

112.	Inactive form of pepsin which has power of destroying cell's internal structure is known as
A.	pepsinogen
B.	pectin
C.	pancreatic
D.	amino pectin
Answer» B. pectin

Discussion

113.	For enzyme activity in human body the optimum temperature is
A.	37c
B.	34c
C.	33c
D.	32c
Answer» B. 34c

Discussion

114.	if the concentration of an enzyme is increased by two fold the rate of reaction would be
A.	half
B.	double
C.	triple
D.	ceased
Answer» C. triple

Discussion

115.	Inactive form of pepsin which has the power of destroying cell's internal structure is known as
A.	pepsinogen
B.	pectin
C.	pancreatic
D.	amino pectin
Answer» B. pectin

Discussion

116.	If co-factor is loosely attached to the protein part, it is termed as
A.	substrate
B.	prosthetic group
C.	catalyst
D.	co-enzyme
Answer» E.

Discussion

117.	The argument about enzyme, that they induces change in its structure when a substrate combines with enzyme was done highlighted in
A.	Lock and Key model
B.	Induce Fit model
C.	Both A and B
D.	none
Answer» C. Both A and B

Discussion

118.	Enzymes are capable of recognizing and reacting with a special chemical substance called
A.	activator
B.	substrate
C.	co-factor
D.	co-enzyme
Answer» C. co-factor

Discussion

119.	Lock and Key model was developed for the visualization of substrate and enzyme concentration was proposed by
A.	Emil Fischer
B.	F. Sanger
C.	Erwin Chargaff
D.	Edward
Answer» B. F. Sanger

Discussion

120.	A chemical substance which have ability to block an active site is called
A.	blocker
B.	deactivator
C.	inhibitor
D.	enzyme
Answer» D. enzyme

Discussion

121.	chemical reactions are accelerated by
A.	high concentration
B.	high ph
C.	high temperature
D.	high density
Answer» D. high density

Discussion

122.	The optimum Ph for Chymotrypsin is
A.	8
B.	7
C.	7--8
D.	7--9
Answer» D. 7--9

Discussion

123.	If vibration become too violent on increasing heat above limit, the enzyme activity will be lost and the enzyme is said to be
A.	catalyzed
B.	broken
C.	denatured
D.	failed
Answer» D. failed

Discussion

124.	An enzyme which is devoid of its either prosthetic group or co-enzyme is designates as
A.	holoenzyme
B.	apoenzyme
C.	substrate
D.	None of Above
Answer» C. substrate

Discussion

125.	Tryprotophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consist of
A.	two proteins designated A and B
B.	a protein designated A
C.	a protein designated B
D.	a protein A and one-subunit a
Answer» B. a protein designated A

Discussion

126.	Enzymes are quite sensitive to change in concentration, temperature and
A.	location
B.	climate
C.	Ph
D.	None of Above
Answer» D. None of Above

Discussion

127.	Which of the following statements about enzymes or their function is true?
A.	Enzymes are proteins whose three-dimensional form is key to their function
B.	Enzymes do not alter the overall change in free energy for a reaction
C.	All of the above
D.	Enzymes speed up reactions by lowering activation energy
Answer» D. Enzymes speed up reactions by lowering activation energy

Discussion

128.	The mechanism of enzyme activity is termed as
A.	hydrolysis
B.	catalysis
C.	proteolysis
D.	None of Above
Answer» C. proteolysis

Discussion

129.	Enzyme activity can be blocked or retarded on minute disturbance in
A.	density
B.	optimum ph
C.	temperature
D.	concentration
Answer» C. temperature

Discussion

130.	The enzymes which are helpful in cellular respiration is found in
A.	Golgi complex
B.	chloroplast
C.	mitochondria
D.	RNA
Answer» D. RNA

Discussion

131.	A co-factor and a polypeptide chain co-exist in an activated enzyme called as
A.	co-factor
B.	holoenzyme
C.	apoenzyme
D.	catalyst
Answer» C. apoenzyme

Discussion

132.	The non-protein part of an enzyme is called
A.	co-enzyme
B.	co-factor
C.	substrate
D.	activator
Answer» C. substrate

Discussion

133.	Inhibitors blocking the active site by making covalent bonds are specifically known as
A.	reversible inhibitors
B.	irreversible inhibitor
C.	competitive inhibitors
D.	non-competitive inhibitors
Answer» C. competitive inhibitors

Discussion

134.	The role of Asp 102 and His 57 during trypsin catalysis is to
A.	. keep the specificity pocket open
B.	neutralize the charge on the other's side chain
C.	clamp the substrate into the active site
D.	function as a proton shuttle
Answer» E.

Discussion

135.	A definite charge bearing site of an enzyme on which a chemical substance attaches itself is called
A.	active site
B.	available site
C.	catalytic site
D.	binding site
Answer» B. available site

Discussion

136.	In which disease of plant stem rot at soil line with brown to red lesions?
A.	Rhizoctonia
B.	Angular leaf Spot
C.	Bacterial Blight
D.	Bacterial Spot
Answer» B. Angular leaf Spot

Discussion

137.	Name a disease of plant in which fine webbing occurs on undersides of the leaves?
A.	Spider Mites
B.	Anthracnose
C.	Mealybugs
D.	Rhizoctonia
Answer» B. Anthracnose

Discussion

138.	Name the disease of plant in which leaves, branches, fruits all are affected?
A.	Spider Mites
B.	Mealybugs
C.	Aphids
D.	Citrus Canker
Answer» E.

Discussion

139.	In which of the following diseases of plant chlorophyll of the leaves get destroyed and leaves get shrinked?
A.	Mosaic disease of tobacco
B.	Citrus Canker
C.	Tundu disease of wheat
D.	Rhizoctonia
Answer» B. Citrus Canker

Discussion

140.	Bacterial blight of Rice disease of plant is caused due to which bacteria?
A.	Pseudomonas bacteria
B.	Xanthomonas citri bacteria
C.	Xanthomonas oryzae bacteria
D.	None of the above
Answer» D. None of the above

Discussion

141.	In which disease of plant white mildew appears typically on underside of leaves?
A.	Cylindrocladium
B.	Angular leaf Spot
C.	Downy Mildew
D.	Black arm of Cotton
Answer» D. Black arm of Cotton

Discussion

142.	Name a disease of plant in which dark to light brown rot forms around wounded plant tissue?
A.	Gray Mold
B.	Citrus Canker
C.	Spider Mites
D.	None of the above
Answer» B. Citrus Canker

Discussion

143.	Bunchy top of banana plant disease is caused due to:
A.	Bacteria
B.	Fungus
C.	Virus
D.	None of the above
Answer» D. None of the above

Discussion

144.	Name the disease of plant in which large yellow spot appears on the leaves?
A.	Bacterial Blight
B.	Bacterial Spot
C.	Aphids
D.	Botrytis
Answer» B. Bacterial Spot

Discussion

145.	Which disease of plant is known as ring disease?
A.	Citrus Canker
B.	Black arm of cotton
C.	Wilt of Potato
D.	None of the above
Answer» D. None of the above

Discussion

146.	Who discovered cell in 1665?
A.	Robert Hook
B.	Robert Crook
C.	David Thomson
D.	Marie Francois
Answer» B. Robert Crook

Discussion

147.	The ‘lock and key hypothesis’ mechanism is related with:
A.	Digestion of fat in the body
B.	For enzyme specificity
C.	For the formation of vacuole
D.	Explosives
Answer» C. For the formation of vacuole

Discussion

148.	In humans salivary amylase enzyme breaks down starch. The optimum pH for this reaction is:
A.	6
B.	6.2
C.	6.4
D.	6.7
Answer» E.

Discussion

149.	Inactive enzymes which are not bound to their cofactors are called
A.	Apoenzymes
B.	Coenzymes
C.	Enzyme inhibitors
D.	Holoenzymes
Answer» B. Coenzymes

Discussion

150.	Which enzyme is used by the biscuit manufacturers to lower the protein level of flour?
A.	Amylase
B.	Protease
C.	Cellulase
D.	Xylanase
Answer» C. Cellulase

Discussion

Explore topic-wise MCQs in Life Sciences.

Physical digestion means the

Plants do not produce

Conversion of hydrogen peroxide (H₂O₂) to water (H₂O) and oxygen (O₂) is carried out by

Lipids are a form of

In mammals, catalase is common in

All are wrong about Hydrogen peroxide (H₂O₂), but

Carbon dioxide (CO₂) and water (H₂O) are produced as output when

Digestive enzymes are used in

Proteases is commonly found in

While cutting big molecules to smaller molecules, enzymes may be called as

Non-protein part of an enzyme is called

Inactive form of pepsin which has power of destroying cell's internal structure is known as

For enzyme activity in human body the optimum temperature is

if the concentration of an enzyme is increased by two fold the rate of reaction would be

Inactive form of pepsin which has the power of destroying cell's internal structure is known as

If co-factor is loosely attached to the protein part, it is termed as

The argument about enzyme, that they induces change in its structure when a substrate combines with enzyme was done highlighted in

Enzymes are capable of recognizing and reacting with a special chemical substance called

Lock and Key model was developed for the visualization of substrate and enzyme concentration was proposed by

A chemical substance which have ability to block an active site is called

chemical reactions are accelerated by

The optimum Ph for Chymotrypsin is

If vibration become too violent on increasing heat above limit, the enzyme activity will be lost and the enzyme is said to be

An enzyme which is devoid of its either prosthetic group or co-enzyme is designates as

Tryprotophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consist of

Enzymes are quite sensitive to change in concentration, temperature and

Which of the following statements about enzymes or their function is true?

The mechanism of enzyme activity is termed as

Enzyme activity can be blocked or retarded on minute disturbance in

The enzymes which are helpful in cellular respiration is found in

A co-factor and a polypeptide chain co-exist in an activated enzyme called as

The non-protein part of an enzyme is called

Inhibitors blocking the active site by making covalent bonds are specifically known as

The role of Asp 102 and His 57 during trypsin catalysis is to

A definite charge bearing site of an enzyme on which a chemical substance attaches itself is called

In which disease of plant stem rot at soil line with brown to red lesions?

Name a disease of plant in which fine webbing occurs on undersides of the leaves?

Name the disease of plant in which leaves, branches, fruits all are affected?

In which of the following diseases of plant chlorophyll of the leaves get destroyed and leaves get shrinked?

Bacterial blight of Rice disease of plant is caused due to which bacteria?

In which disease of plant white mildew appears typically on underside of leaves?

Name a disease of plant in which dark to light brown rot forms around wounded plant tissue?

Bunchy top of banana plant disease is caused due to:

Name the disease of plant in which large yellow spot appears on the leaves?

Which disease of plant is known as ring disease?

Who discovered cell in 1665?

The ‘lock and key hypothesis’ mechanism is related with:

In humans salivary amylase enzyme breaks down starch. The optimum pH for this reaction is:

Inactive enzymes which are not bound to their cofactors are called

Which enzyme is used by the biscuit manufacturers to lower the protein level of flour?