Quiz: Urease


UreaseOnline version Test your urease science know-how by Maria 1 What enzyme catalyses the hydrolysis of urea? a Lipase b Amylase c Protease d Urease 2 Where are ureases commonly found? a Plant chloroplasts b Soil bacteria c Mammalian blood plasma d Human liver cells 3 What are the main products of urea hydrolysis by urease? a Nitrate and hydrogen b Nitric oxide and water c Ammonium sulfate and water d Ammonia and carbon dioxide 4 What two metal ions are located in the urease active site? a Two nickel ions (Ni2+) b Two zinc ions (Zn2+) c Two copper ions (Cu2+) d Two iron ions (Fe2+) 5 What molecule initially participates in the urease reaction as the substrate? a Urea b Carbon dioxide c Water d Ammonia 6 Which amino acid residue in urease is involved in coordinating the active site? a Cystine b Tryptophan c Methionine d Carbamylated lysine 7 What is the effect of high temperature on urease activity? a Denaturation and loss of activity b No effect c Activation and faster reaction d Increased stability 8 Optimum pH range for urease activity is approximately? a Around pH 3 b Around pH 11 c Around pH 5 d Around pH 7–8 9 What primary role does urease play in soil ecosystems? a Nitrogen recycling b Water splitting c Phosphorus storage d Sulfur oxidation 10 Which organism is known to use urease to neutralize stomach acid? a Staphylococcus aureus b Escherichia coli c Candida albicans d Helicobacter pylori 11 What happens to the products after urea is hydrolyzed by urease? a Ammonia gas escapes unchanged b Ammonia reacts with water to form hydroxide ions c Carbon monoxide is produced d Hydrogen peroxide is formed 12 Urease activity supports which stage of plant growth most? a Dormancy b Senescence c Germination d Maturity 13 True or False: Urease is a hydrolase enzyme. a Only in bacteria b Cannot be determined c True d False 14 Which real-world application uses urease activity as a diagnostic tool? a Bone density testing b Blood glucose monitoring c Breath tests for H. pylori infections d MRI contrast enhancement 15 What happens to urea in the absence of urease activity in soils? a Soil becomes acidic b There is no nitrogen cycle at all c Nitrogen recycling slows and soil fertility declines d Urea rapidly converts to nitrogen gas Explicación 1 Urease is the enzyme that hydrolyzes urea into ammonia and carbon dioxide. 2 Urease is found in soil bacteria, among other organisms. 3 Hydrolysis of urea yields ammonia (NH3) and carbon dioxide (CO2). 4 The active site contains two bridged Ni2+ ions essential for catalysis. 5 Urea is the substrate that binds in the active site for hydrolysis. 6 A carbamylated lysine residue helps bridge the nickel ions. 7 Excessive heat disrupts the enzyme structure, denaturing it. 8 Neutral to mildly alkaline pH favors urease activity. 9 Urease helps convert urea to ammonia, recycling nitrogen for plants. 10 H. pylori produces urease to raise local pH and survive in the stomach. 11 Ammonia produced increases pH by forming NH4+ and OH- in solution. 12 Plants use the ammonia produced for growth during germination. 13 Urease is classified as a hydrolase. 14 Urease activity is used in diagnostic breath tests for H. pylori. 15 Without urease, urea hydrolysis is slow, reducing available nitrogen.

1

What enzyme catalyses the hydrolysis of urea?

a

Lipase

b

Amylase

c

Protease

d

Urease

2

Where are ureases commonly found?

a

Plant chloroplasts

b

Soil bacteria

c

Mammalian blood plasma

d

Human liver cells

3

What are the main products of urea hydrolysis by urease?

a

Nitrate and hydrogen

b

Nitric oxide and water

c

Ammonium sulfate and water

d

Ammonia and carbon dioxide

4

What two metal ions are located in the urease active site?

a

Two nickel ions (Ni2+)

b

Two zinc ions (Zn2+)

c

Two copper ions (Cu2+)

d

Two iron ions (Fe2+)

5

What molecule initially participates in the urease reaction as the substrate?

a

Urea

b

Carbon dioxide

c

Water

d

Ammonia

6

Which amino acid residue in urease is involved in coordinating the active site?

a

Cystine

b

Tryptophan

c

Methionine

d

Carbamylated lysine

7

What is the effect of high temperature on urease activity?

a

Denaturation and loss of activity

b

No effect

c

Activation and faster reaction

d

Increased stability

8

Optimum pH range for urease activity is approximately?

a

Around pH 3

b

Around pH 11

c

Around pH 5

d

Around pH 7–8

9

What primary role does urease play in soil ecosystems?

a

Nitrogen recycling

b

Water splitting

c

Phosphorus storage

d

Sulfur oxidation

10

Which organism is known to use urease to neutralize stomach acid?

a

Staphylococcus aureus

b

Escherichia coli

c

Candida albicans

d

Helicobacter pylori

11

What happens to the products after urea is hydrolyzed by urease?

a

Ammonia gas escapes unchanged

b

Ammonia reacts with water to form hydroxide ions

c

Carbon monoxide is produced

d

Hydrogen peroxide is formed

12

Urease activity supports which stage of plant growth most?

a

Dormancy

b

Senescence

c

Germination

d

Maturity

13

True or False: Urease is a hydrolase enzyme.

a

Only in bacteria

b

Cannot be determined

c

True

d

False

14

Which real-world application uses urease activity as a diagnostic tool?

a

Bone density testing

b

Blood glucose monitoring

c

Breath tests for H. pylori infections

d

MRI contrast enhancement

15

What happens to urea in the absence of urease activity in soils?

a

Soil becomes acidic

b

There is no nitrogen cycle at all

c

Nitrogen recycling slows and soil fertility declines

d

Urea rapidly converts to nitrogen gas

Explicación

1

Urease is the enzyme that hydrolyzes urea into ammonia and carbon dioxide.

2

Urease is found in soil bacteria, among other organisms.

3

Hydrolysis of urea yields ammonia (NH3) and carbon dioxide (CO2).

4

The active site contains two bridged Ni2+ ions essential for catalysis.

5

Urea is the substrate that binds in the active site for hydrolysis.

6

A carbamylated lysine residue helps bridge the nickel ions.

7

Excessive heat disrupts the enzyme structure, denaturing it.

8

Neutral to mildly alkaline pH favors urease activity.

9

Urease helps convert urea to ammonia, recycling nitrogen for plants.

10

H. pylori produces urease to raise local pH and survive in the stomach.

11

Ammonia produced increases pH by forming NH4+ and OH- in solution.

12

Plants use the ammonia produced for growth during germination.

13

Urease is classified as a hydrolase.

14

Urease activity is used in diagnostic breath tests for H. pylori.

15

Without urease, urea hydrolysis is slow, reducing available nitrogen.

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Urease

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UreaseOnline version

by Maria

What enzyme catalyses the hydrolysis of urea?

Where are ureases commonly found?

What are the main products of urea hydrolysis by urease?

What two metal ions are located in the urease active site?

What molecule initially participates in the urease reaction as the substrate?

Which amino acid residue in urease is involved in coordinating the active site?

What is the effect of high temperature on urease activity?

Optimum pH range for urease activity is approximately?

What primary role does urease play in soil ecosystems?

Which organism is known to use urease to neutralize stomach acid?

What happens to the products after urea is hydrolyzed by urease?

Urease activity supports which stage of plant growth most?

True or False: Urease is a hydrolase enzyme.

Which real-world application uses urease activity as a diagnostic tool?

What happens to urea in the absence of urease activity in soils?

Explicación

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