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Enzymes L3

Enzymes L3

Assessment

Presentation

Biology

12th Grade

Practice Problem

Medium

NGSS
HS-PS1-5, MS-LS1-7, HS-PS1-4

Standards-aligned

Created by

Emma Dawes

Used 6+ times

FREE Resource

12 Slides • 20 Questions

1

Enzymes L3

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2

Multiple Choice

Organelles that make proteins by putting together chains of amino acids.

1

Mitochondria

2

Lysosomes

3

Ribsomes

4

Chloroplast

3

Multiple Choice

All amino acids have a ...

1

ether group & carboxyl group

2

amino group & hydroxide group

3

amino group & carboxyl group

4

ether group & hydroxide group

4

Multiple Choice

If a amino acid is Non-polar it is

1

Hydrophobic

2

Hydrophilic

5

Multiple Choice

Any substance that is acted upon by an enzyme is called a(n)?
1
Coenzyme
2
Substrate
3
Vitamin
4
Polypeptide

6

Multiple Choice

What is a substance called if it speeds up a chemical reaction?
1
reusable
2
catalyst
3
specific
4
fragile

7

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8

Multiple Choice

What is a cofactor (L1)?

1

A carbohydrate side chain that activates an enzyme.

2

A non-protein that is bound to an enzyme and is required for catalysis.

3

A requirement for the hydrolysis of urease.

4

A non-protein that is not attached to the enzyme structure.

9

Multiple Select

Which are cofactors?

1

A catalase molecule

2

Coenzymes

3

Polypeptides

4

Prosthetic groups

10

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11

Poll

Which environmental factors do you think might affect enzyme action?

Temperature

Moisture availabilty

Substrate concentration

pH

Salinity

12

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13

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The optimum temperature range varies for different enzymes.

14

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15

Multiple Select

What conditions do you think would be optimal for the action of pepsin?

1

37 - 42 degrees Celsius

2

32 - 36 degrees Celsius

3

pH 1.5 - 2.0

4

pH 4.5 - 7.0

16

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Vm is the maximum level of enzyme activity and cannot be exceeded.

17

Multiple Choice

Vm is reached when...

1

maximum temperature is reached.

2

The pH is optimal.

3

Roughly 50% of enzymes are bound to substrate.

4

the enzyme is saturated.

18

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19

Poll

Can you confidently explain what a cofactor is?

Yes!

Not sure

No.

20

Enzyme Inhibitors

chemicals which bind to an enzyme to suppress its activity

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21

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Reversible inhibitors either bind to an active site (competitive inhibitors), or to another site on the enzyme (non-competitive inhibitors).

22

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23

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24

Multiple Choice

You are given a reaction and are told it is at “saturation.” To determine if this is true, you should add _______ and see if the reaction rate _______.

1

ATP; increases

2

more substrate; increases

3

a competitive inhibitor; decreases

4

a downstream product; decreases

5

a noncompetitive inhibitor; decreases

25

Multiple Choice

Question image
Which explanation best fits the graph for pH's effect on an enzyme?
1
As the pH gets closer to neutral more H-Bonds are broken
2
Larger numbers of H+ & OH- ions distort the active site
3
There are more collisions between substrates and active sites near the optimal pH
4
Low pHs cause more H-Bonds to happen near the active site

26

Multiple Choice

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Molecules that bind to enzymes and enhance an enzyme's ability are called:
1
CoFactors
2
CoEnzymes
3
Allosteric Inhibitors
4
Allosteric Activators

27

Multiple Choice

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When a molecule can occupy the same active site as the substrate, a situation called __________________ can result
1
Competitive lnhibition
2
Allosteric Regulation
3
Non-Competitive Inhibition
4
Feedback Inhibition

28

Multiple Choice

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The molecule an enzyme is working on is called the:
1
Substrate
2
Solvent
3
Allosteric Inhibitor
4
CoEnzyme

29

Multiple Choice

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At low temperatures enzyme activity declines because of:
1
Denaturation
2
Decreased Kinetic Motion
3
Increased H-Bonding
4
Dissociation of Ionic Compounds

30

Multiple Choice

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At high temperatures enzyme activity declines because of:
1
Denaturation
2
Decreased Kinetic Motion
3
Increased H-Bonding
4
Dissociation of Ionic Compounds

31

Multiple Choice

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Enzymes catalyze reactions by ___________ Activation Energy.
1
Increasing
2
Decreasing

32

Multiple Choice

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The current model of enzyme action is referred to as the:
1
Induced Fit Model
2
Lock & Key Model
3
Singer-Nicolson Model
4
Davson-Danielli Model

Enzymes L3

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