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
icon
Related questions
Question
Item22
 
 
 

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.

     

     
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 5 steps

Blurred answer
Similar questions
Recommended textbooks for you
Biochemistry
Biochemistry
Biochemistry
ISBN:
9781319114671
Author:
Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:
W. H. Freeman
Lehninger Principles of Biochemistry
Lehninger Principles of Biochemistry
Biochemistry
ISBN:
9781464126116
Author:
David L. Nelson, Michael M. Cox
Publisher:
W. H. Freeman
Fundamentals of Biochemistry: Life at the Molecul…
Fundamentals of Biochemistry: Life at the Molecul…
Biochemistry
ISBN:
9781118918401
Author:
Donald Voet, Judith G. Voet, Charlotte W. Pratt
Publisher:
WILEY
Biochemistry
Biochemistry
Biochemistry
ISBN:
9781305961135
Author:
Mary K. Campbell, Shawn O. Farrell, Owen M. McDougal
Publisher:
Cengage Learning
Biochemistry
Biochemistry
Biochemistry
ISBN:
9781305577206
Author:
Reginald H. Garrett, Charles M. Grisham
Publisher:
Cengage Learning
Fundamentals of General, Organic, and Biological …
Fundamentals of General, Organic, and Biological …
Biochemistry
ISBN:
9780134015187
Author:
John E. McMurry, David S. Ballantine, Carl A. Hoeger, Virginia E. Peterson
Publisher:
PEARSON