[MCQ]ENZYMES- Part 17

I. Start the exam by click the “Start” button

ENZYMES- Part 17

Please wait while the activity loads.
If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled.

If loading fails, click here to try again

Start

Congratulations - you have completed ENZYMES- Part 17. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

Enzymes increases the rate of reactions by

A	Increasing the free energy of activation
B	Decreasing the energy of activation
C	Changing the equilibrium constant of the reaction
D	Increasing the free energy change of the reaction

Question 2

The active site of an enzyme is formed by a few of the enzymes:

A	R groups of the amino acids
B	Amino groups of the amino acids
C	Carboxyl group of the amino acids
D	Exposed sulfur bonds

Question 3

Allosteric enzymes contain

A	Multiple subunits
B	Single chain
C	Two chains
D	Three chains

Question 4

Isoenzymes of lactate dehydrogenase are useful for the diagnosis of

A	Heart disease
B	Kidney disease
C	Liver disease
D	Both (A) and (C)

Question 5

IUB had divided enzymes into how many classes?

A	6
B	5
C	8
D	4

Question 6

The first enzyme isolated, purified and crystallied from Jack bean (Canavalia) by summer in 1926 was

A	Urease
B	Insulin
C	Ribonuclease
D	Zymase

Question 7

Who suggested that enzymes are proteinaceous?

A	Buchner
B	Kuhne
C	Sumner
D	Pasteur

Question 8

Feedback inhibition of enzyme action is affected by

A	Enzyme
B	Substrate
C	End products
D	None of these

Question 9

The enzyme that converts glucose to glucose-6-phosphate is

A	Phosphatase
B	Hexokinase
C	Phosphorylase
D	Glucose synthetase

Question 10

Enzymes are required in traces because they

A	Have high turnover number
B	Remain unused at the end of reaction and are re used
C	Show cascade effect
D	All correct

Question 11

An organic substance bound to an enzyme and essential for the activity of enzyme is called

A	Holoenzyme
B	Apoenzyme
C	Coenzyme
D	Isoenzyme

Question 12

Enzyme catalysed reactions occur in

A	Pico seconds
B	Micro seconds
C	Milli seconds
D	None of these

Question 13

An enzyme can accelerate a reaction up to

A	1010 times
B	101 times
C	10100 times
D	10 times

Question 14

In plants, enzymes occur in

A	Flowers only
B	Leaves only
C	All living cells
D	Storage organs only

Question 15

Zymogen is a

A	Vitamin
B	Enzyme precursor
C	Modulator
D	Hormone

Question 16

Cofactor (Prosthetic group) is a part of holoenzyme, it is

A	Inorganic part loosely attached
B	Accessory non-protein substance attached firmly
C	Organic part attached loosely
D	None of these

Question 17

A protein having both structural and enzymatic traits is

A	Myosin
B	Collagen
C	Trypsin
D	Actin

Question 18

Enzymes are different from catalysts in

A	Being proteinaceous
B	Not used up in reaction
C	Functional at high temperature
D	Having high rate of diffusion

Question 19

Enzymes, vitamins and hormones are common in

A	Being proteinaceous
B	Being synthesized in the body of organisms
C	Enhancing oxidative metabolism
D	Regulating metabolism

Question 20

Dry seeds endure higher temperature than germinating seeds as

A	Hydration is essential for making enzymes sensitive to temperature
B	Dry seeds have a hard covering
C	Dry seeds have more reserve food
D	Seedlings are tender

Question 21

Coenzymes FMN and FAD are derived from vitamin

A	C
B	B6
C	B1
D	B2

Question 22

Template/lock and key theory of enzyme action is supported by

A	Enzymes speed up reaction
B	Enzymes occur in living beings and speed up certain reactions
C	Enzymes determine the direction of reaction
D	Compounds similar to substrate inhibit enzyme activity

Question 23

Combination of apoenzyme and coenzyme produces

A	Prosthetic group
B	Holoenzyme
C	Enzyme substrate complex
D	Enzyme product complex

Question 24

Enzyme inhibition caused by a substance resembling substrate molecule is

A	Competitive inhibition
B	Non-competitive inhibition
C	Feedback inhibition
D	Allosteric inhibition

Question 25

An enzyme brings about

A	Decrease in reaction time
B	Increase in reaction time
C	Increase in activation energy
D	Reduction in activation energy

Question 26

Feedback inhibition of enzyme is influenced by

A	Enzyme
B	External factors
C	End product
D	Substrate

Question 27

Coenzyme is

A	Often a vitamin
B	Always an inorganic compound
C	Always a protein
D	Often a metal

Question 28

Genetic engineering requires enzyme:

A	DNA ase
B	Amylase
C	Lipase
D	Restriction endonuclease

Question 29

Which is not true about inorganic catalysts and enzymes?

A	They are specific
B	Inorganic catalysts require specific not needed by enzymes
C	They are sensitive to pH
D	They speed up the rate of chemical reaction

Question 30

Key and lock hypothesis of enzyme action was given by

A	Fischer
B	Koshland
C	Buchner
D	Kuhne

Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results

There are 30 questions to complete.

←

List

→

Return

Shaded items are complete.

1	2	3	4	5
6	7	8	9	10
11	12	13	14	15
16	17	18	19	20
21	22	23	24	25
26	27	28	29	30
End

Return

See all quizzes of ENZYMES- Part 17 here:

1 Enzymes increases the rate of reactions
by
(A) Increasing the free energy of activation
(B) Decreasing the energy of activation
(C) Changing the equilibrium constant of the
reaction
(D) Increasing the free energy change of the
reaction
2. The active site of an enzyme is formed by
a few of the enzymes:
(A) R groups of the amino acids
(B) Amino groups of the amino acids
(C) Carboxyl group of the amino acids
(D) Exposed sulfur bonds
3. Allosteric enzymes contain
(A) Multiple subunits (B) Single chain
(C) Two chains (D) Three chains
4. Isoenzymes of lactate dehydrogenase are
useful for the diagnosis of
(A) Heart disease (B) Kidney disease
(C) Liver disease (D) Both (A) and (C)
5. IUB had divided enzymes into how many
classes?
(A) 6 (B) 5
(C) 8 (D) 4
6. The first enzyme isolated, purified and
crystallied from Jack bean (Canavalia) by
summer in 1926 was
(A) Urease (B) Insulin
(C) Ribonuclease (D) Zymase
7. Who suggested that enzymes are proteinaceous?
(A) Buchner (B) Kuhne
(C) Sumner (D) Pasteur
8. Feedback inhibition of enzyme action is
affected by
(A) Enzyme (B) Substrate
(C) End products (D) None of these
9. The enzyme that converts glucose to
glucose-6-phosphate is
(A) Phosphatase (B) Hexokinase
(C) Phosphorylase (D) Glucose synthetase
10. Enzymes are required in traces because
they
(A) Have high turnover number
(B) Remain unused at the end of reaction and
are re used
(C) Show cascade effect
(D) All correct
11. An organic substance bound to an
enzyme and essential for the activity of
enzyme is called
(A) Holoenzyme (B) Apoenzyme
(C) Coenzyme (D) Isoenzyme

12. Enzyme catalysed reactions occur in
(A) Pico seconds (B) Micro seconds
(C) Milli seconds (D) None of these
13. An enzyme can accelerate a reaction up to
(A) 1010 times (B) 101 times
(C) 10100 times (D) 10 times
14. In plants, enzymes occur in
(A) Flowers only (B) Leaves only
(C) All living cells (D) Storage organs only
15. Zymogen is a
(A) Vitamin (B) Enzyme precursor
(C) Modulator (D) Hormone
16. Cofactor (Prosthetic group) is a part of
holoenzyme, it is
(A) Inorganic part loosely attached
(B) Accessory non-protein substance attached
firmly
(C) Organic part attached loosely
(D) None of these
17. A protein having both structural and
enzymatic traits is
(A) Myosin (B) Collagen
(C) Trypsin (D) Actin
18. Enzymes are different from catalysts in
(A) Being proteinaceous
(B) Not used up in reaction
(C) Functional at high temperature
(D) Having high rate of diffusion
19. Enzymes, vitamins and hormones are
common in
(A) Being proteinaceous
(B) Being synthesized in the body of organisms
(C) Enhancing oxidative metabolism
(D) Regulating metabolism
20. Dry seeds endure higher temperature
than germinating seeds as
(A) Hydration is essential for making enzymes
sensitive to temperature
(B) Dry seeds have a hard covering
(C) Dry seeds have more reserve food
(D) Seedlings are tender
21. Coenzymes FMN and FAD are derived
from vitamin
(A) C (B) B6
(C) B1 (D) B2
22. Template/lock and key theory of enzyme
action is supported by
(A) Enzymes speed up reaction
(B) Enzymes occur in living beings and speed
up certain reactions
(C) Enzymes determine the direction of reaction
(D) Compounds similar to substrate inhibit enzyme
activity
23. Combination of apoenzyme and
coenzyme produces
(A) Prosthetic group
(B) Holoenzyme
(C) Enzyme substrate complex
(D) Enzyme product complex
24. Enzyme inhibition caused by a substance
resembling substrate molecule is
(A) Competitive inhibition
(B) Non-competitive inhibition
(C) Feedback inhibition
(D) Allosteric inhibition
25. An enzyme brings about
(A) Decrease in reaction time
(B) Increase in reaction time
(C) Increase in activation energy
(D) Reduction in activation energy
26. Feedback inhibition of enzyme is influenced
by
(A) Enzyme (B) External factors
(C) End product (D) Substrate
27. Coenzyme is
(A) Often a vitamin (B) Always an inorganic
compound
(C) Always a protein (D) Often a metal
28. Genetic engineering requires enzyme:
(A) DNA ase
(B) Amylase
(C) Lipase
(D) Restriction endonuclease
29. Which is not true about inorganic catalysts
and enzymes?
(A) They are specific
(B) Inorganic catalysts require specific not
needed by enzymes
(C) They are sensitive to pH
(D) They speed up the rate of chemical reaction
30. Key and lock hypothesis of enzyme action
was given by
(A) Fischer (B) Koshland
(C) Buchner (D) Kuhne

ENZYMES

[MCQ]ENZYMES- Part 17

I. Start the exam by click the “Start” button

ENZYMES- Part 17

Share this:

Related

[MCQ]ENZYMES- Part 16

[MCQ]ENZYMES- Part 18

You may also like

Leave a Comment Cancel Reply