Item 22 The region of an enzyme into which the substrate fits is a Multiple Choice one-size-fits-all active site. highly specific active site. highly specific antibody. one-size-fits-all antibody. 23 Item 23 Which enzyme class splits a chemical bond in the absence of water? Multiple Choice Ligase Oxidoreductase Lyase Hydrolase Dehydrogenase 24 Item 24 Extremely high temperatures break intramolecular interactions and _________ an enzyme, resulting in a loss of its function. Fill in the blank Item25 Item 25 Enzymes that remove phosphate groups from their substrates are called __________. Fill in the blank Item26 Item 26 The optimal pH range for the stomach enzyme pepsin is Multiple Choice 2–4. 6–8. 7.3–7.4. 10–12. 12.0–13.5. Item27 Item 27 Allosteric inhibitors are also called noncompetitive inhibitors. True or False Item28 Item 28 In the final step of enzymatic catalysis, Multiple Choice the substrate is released and the enzyme is inactivated. the product is completed and the enzyme is inactivated. the products are released and the enzyme is free to bind other substrates. the enzyme and substrate form chemical bonds with each other resulting in a new product. equilibrium is obtained so that the enzyme does not catalyze further reactions Item29 Item 29 A protein kinase is an enzyme that adds a phosphate to its substrate. True or False Item30 Item 30 Saturation occurs when Multiple Choice there is so much enzyme present that the reaction rate decreases if more is added. all enzymes are busy and further increases in substrate concentration will not increase reaction rate. enzymes become fatigued and can no longer catalyze changes in the substrate. intramolecular interactions are disrupted in the enzyme, decreasing its efficiency and decreasing reaction rate. the substrate is denatured and the enzyme cannot catalyze any changes in its structure. 31 Item 31 The presence of an enzyme within a chemical system Multiple Choice increases activation energy. decreases activation energy. increases potential energy. does not affect either activation energy or potential energy. Item32 Item 32 In the regulation of enzymes, negative feedback ensures that a lot of product can be made from only a little bit of substrate. True or False Item33 Item 33 When multiple enzymes are organized in a metabolic pathway, each enzyme catalyzes one reaction and then releases the product. True or False Item34 Item 34 Lactose intolerance is caused by the lack of the enzyme lactase. This enzyme _________ the cells that make it. Multiple Choice is embedded within the membranes of is secreted from remains within None of the choices are correct. Item35 Item 35 Organic cofactors are referred to as _________. Fill in the blank 36 Item 36 Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the Multiple Choice allosteric site, and its effectiveness is not influenced by substrate concentration. allosteric site, and its effectiveness depends on substrate concentration. active site, and its effectiveness is not influenced by substrate concentration. active site, and its effectiveness depends on substrate concentration. substrate, and its effectiveness depends on product concentration. Item37 Item 37 A substance that binds to the active site of an enzyme and turns it off is called a _________ inhibitor. Fill in the blank Item38 Item 38 Lactase is an enzyme that digests lactose. Group startsTrue or False Item39 Item 39 Exergonic reactions do not require activation energy. Group startsTrue or False Item40 Item 40 An enzyme that is described as a protein kinase is a Multiple Choice hydrolase that removes an amino acid from a protein. transferase that transfers a phosphate group to a protein substrate. ligase that adds an amino acid to a protein. isomerase that changes one protein into another. protease that transfers electrons from one protein to another.

Item 22 The region of an enzyme into which the substrate fits is a Multiple Choice one-size-fits-all active site. highly specific active site. highly specific antibody. one-size-fits-all antibody. 23 Item 23 Which enzyme class splits a chemical bond in the absence of water? Multiple Choice Ligase Oxidoreductase Lyase Hydrolase Dehydrogenase 24 Item 24 Extremely high temperatures break intramolecular interactions and ___ an enzyme, resulting in a loss of its function. Fill in the blank Item25 Item 25 Enzymes that remove phosphate groups from their substrates are called . Fill in the blank Item26 Item 26 The optimal pH range for the stomach enzyme pepsin is Multiple Choice 2–4. 6–8. 7.3–7.4. 10–12. 12.0–13.5. Item27 Item 27 Allosteric inhibitors are also called noncompetitive inhibitors. True or False Item28 Item 28 In the final step of enzymatic catalysis, Multiple Choice the substrate is released and the enzyme is inactivated. the product is completed and the enzyme is inactivated. the products are released and the enzyme is free to bind other substrates. the enzyme and substrate form chemical bonds with each other resulting in a new product. equilibrium is obtained so that the enzyme does not catalyze further reactions Item29 Item 29 A protein kinase is an enzyme that adds a phosphate to its substrate. True or False Item30 Item 30 Saturation occurs when Multiple Choice there is so much enzyme present that the reaction rate decreases if more is added. all enzymes are busy and further increases in substrate concentration will not increase reaction rate. enzymes become fatigued and can no longer catalyze changes in the substrate. intramolecular interactions are disrupted in the enzyme, decreasing its efficiency and decreasing reaction rate. the substrate is denatured and the enzyme cannot catalyze any changes in its structure. 31 Item 31 The presence of an enzyme within a chemical system Multiple Choice increases activation energy. decreases activation energy. increases potential energy. does not affect either activation energy or potential energy. Item32 Item 32 In the regulation of enzymes, negative feedback ensures that a lot of product can be made from only a little bit of substrate. True or False Item33 Item 33 When multiple enzymes are organized in a metabolic pathway, each enzyme catalyzes one reaction and then releases the product. True or False Item34 Item 34 Lactose intolerance is caused by the lack of the enzyme lactase. This enzyme _ the cells that make it. Multiple Choice is embedded within the membranes of is secreted from remains within None of the choices are correct. Item35 Item 35 Organic cofactors are referred to as _. Fill in the blank 36 Item 36 Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the Multiple Choice allosteric site, and its effectiveness is not influenced by substrate concentration. allosteric site, and its effectiveness depends on substrate concentration. active site, and its effectiveness is not influenced by substrate concentration. active site, and its effectiveness depends on substrate concentration. substrate, and its effectiveness depends on product concentration. Item37 Item 37 A substance that binds to the active site of an enzyme and turns it off is called a _____ inhibitor. Fill in the blank Item38 Item 38 Lactase is an enzyme that digests lactose. Group startsTrue or False Item39 Item 39 Exergonic reactions do not require activation energy. Group startsTrue or False Item40 Item 40 An enzyme that is described as a protein kinase is a Multiple Choice hydrolase that removes an amino acid from a protein. transferase that transfers a phosphate group to a protein substrate. ligase that adds an amino acid to a protein. isomerase that changes one protein into another. protease that transfers electrons from one protein to another.

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

See similar textbooks

Item 22

The region of an enzyme into which the substrate fits is a

Multiple Choice

one-size-fits-all active site.
highly specific active site.
highly specific antibody.
one-size-fits-all antibody.

23

Item 23

Which enzyme class splits a chemical bond in the absence of water?
Multiple Choice
- Ligase
- Oxidoreductase
- Lyase
- Hydrolase
- Dehydrogenase
24

Item 24

Extremely high temperatures break intramolecular interactions and _________ an enzyme, resulting in a loss of its function.

Fill in the blank

Item25

Item 25

Enzymes that remove phosphate groups from their substrates are called __________.

Fill in the blank

Item26

Item 26

The optimal pH range for the stomach enzyme pepsin is

Multiple Choice

2–4.
6–8.
7.3–7.4.
10–12.
12.0–13.5.

Item27

Item 27

Allosteric inhibitors are also called noncompetitive inhibitors.
True or False
Item28

Item 28

In the final step of enzymatic catalysis,

Multiple Choice

the substrate is released and the enzyme is inactivated.

the product is completed and the enzyme is inactivated.

the products are released and the enzyme is free to bind other substrates.

the enzyme and substrate form chemical bonds with each other resulting in a new product.

equilibrium is obtained so that the enzyme does not catalyze further reactions

Item29

Item 29

A protein kinase is an enzyme that adds a phosphate to its substrate.

True or False

Item30

Item 30

Saturation occurs when

Multiple Choice

there is so much enzyme present that the reaction rate decreases if more is added.

all enzymes are busy and further increases in substrate concentration will not increase reaction rate.

enzymes become fatigued and can no longer catalyze changes in the substrate.

intramolecular interactions are disrupted in the enzyme, decreasing its efficiency and decreasing reaction rate.

the substrate is denatured and the enzyme cannot catalyze any changes in its structure.

31

Item 31

The presence of an enzyme within a chemical system

Multiple Choice

increases activation energy.

decreases activation energy.

increases potential energy.

does not affect either activation energy or potential energy.

Item32

Item 32

In the regulation of enzymes, negative feedback ensures that a lot of product can be made from only a little bit of substrate.

True or False

Item33

Item 33

When multiple enzymes are organized in a metabolic pathway, each enzyme catalyzes one reaction and then releases the product.

True or False

Item34

Item 34

Lactose intolerance is caused by the lack of the enzyme lactase. This enzyme _________ the cells that make it.

Multiple Choice

is embedded within the membranes of

is secreted from

remains within

None of the choices are correct.

Item35

Item 35

Organic cofactors are referred to as _________.

Fill in the blank

36

Item 36

Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the

Multiple Choice

allosteric site, and its effectiveness is not influenced by substrate concentration.

allosteric site, and its effectiveness depends on substrate concentration.

active site, and its effectiveness is not influenced by substrate concentration.

active site, and its effectiveness depends on substrate concentration.

substrate, and its effectiveness depends on product concentration.

Item37

Item 37

A substance that binds to the active site of an enzyme and turns it off is called a _________ inhibitor.

Fill in the blank

Item38

Item 38

Lactase is an enzyme that digests lactose.

Group startsTrue or False

Item39

Item 39

Exergonic reactions do not require activation energy.

Group startsTrue or False

Item40

Item 40

An enzyme that is described as a protein kinase is a

Multiple Choice

hydrolase that removes an amino acid from a protein.

transferase that transfers a phosphate group to a protein substrate.

ligase that adds an amino acid to a protein.

isomerase that changes one protein into another.

protease that transfers electrons from one protein to another.

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