Question 1

In any reaction catalyzed by an enzyme, the reacting molecule is called the

Accepted Answer

A) substrate. 
B) cofactor. 
C) coenzyme. 
D) isozyme. 
E) allostere. 
A) substrate. 
B) cofactor. 
C) coenzyme. 
D) isozyme. 
E) allostere.

Question 2

An enzyme that converts a cis double bond to a trans double bond is classified as a(n) ________.

Accepted Answer

A) oxidoreductase 
B) transferase 
C) hydrolase 
D) lyase 
E) isomerase 
A) oxidoreductase 
B) transferase 
C) hydrolase 
D) lyase 
E) isomerase

Question 3

When a cofactor is a small organic molecule, it is known as a(n)

Accepted Answer

A) isoenzyme. 
B) vitamin. 
C) zymogen. 
D) coenzyme. 
E) regulator. 
A) isoenzyme. 
B) vitamin. 
C) zymogen. 
D) coenzyme. 
E) regulator.

Question 4

Indicate whether each of the following is fat soluble or water soluble.
-riboflavin

Accepted Answer

The answer of Indicate whether each of the following is...

Question 5

Phosphorylation is a common form of covalent modification.

Accepted Answer

A) True 
 B)False

Question 6

Identify each of the designated regions on the energy diagram for the conversion of a substrate to product with and without an enzyme.  
-energy of the substrate

Accepted Answer

The answer of Identify each of the designated regions on...

Question 7

To what main class of enzymes does the enzyme that catalyzes the following reaction belong? Ser - Ala → Ser + Ala

Accepted Answer

A) oxidoreductase 
B) transferase 
C) hydrolase 
D) lyase 
E) isomerase 
A) oxidoreductase 
B) transferase 
C) hydrolase 
D) lyase 
E) isomerase

Question 8

A noncompetitive inhibitor has a structure that

Accepted Answer

A) does not resemble the substrate structure. 
B) resembles the active site of the enzyme. 
C) can bind to the active site of the enzyme. 
D) does not interfere with the enzyme-substrate complex formation. 
E) causes a change in the shape of the substrate. 
A) does not resemble the substrate structure. 
B) resembles the active site of the enzyme. 
C) can bind to the active site of the enzyme. 
D) does not interfere with the enzyme-substrate complex formation. 
E) causes a change in the shape of the substrate.

Question 9

When an end product from an enzyme-mediated sequence is also an inhibitor for an earlier step in the reaction sequence, the process is referred to as

Accepted Answer

A) feedback control. 
B) competitive inhibition. 
C) irreversible inhibition. 
D) negative catalysis. 
E) concentration control. 
A) feedback control. 
B) competitive inhibition. 
C) irreversible inhibition. 
D) negative catalysis. 
E) concentration control.

Question 10

When an end product from an enzyme-mediated sequence is also an inhibitor for an earlier step in the reaction sequence, the process is referred to as

Accepted Answer

A) feedback control. 
B) competitive inhibition. 
C) irreversible inhibition. 
D) negative catalysis. 
E) concentration control. 
A) feedback control. 
B) competitive inhibition. 
C) irreversible inhibition. 
D) negative catalysis. 
E) concentration control.

Question 11

One deficiency disease that can be traced to insufficient intake of vitamin D is ________.

Accepted Answer

A) scurvy 
B) rickets 
C) beriberi 
D) pellagra 
E) pernicious anemia 
A) scurvy 
B) rickets 
C) beriberi 
D) pellagra 
E) pernicious anemia

Question 12

The presence of enzymes to catalyze bioreactions in our bodies allows

Accepted Answer

A) us to eat non-nutritious substances without consequence. 
B) the activation energy of a reaction to be raised. 
C) the rate of a desired chemical reaction to slow down. 
D) bioreactions to occur under extreme conditions of temperature and pH. 
E) bioreactions to take place under mild conditions. 
A) us to eat non-nutritious substances without consequence. 
B) the activation energy of a reaction to be raised. 
C) the rate of a desired chemical reaction to slow down. 
D) bioreactions to occur under extreme conditions of temperature and pH. 
E) bioreactions to take place under mild conditions.

Question 13

Enzymes that catalyze the same reactions but have slightly different structures are called ________.

Accepted Answer

A) coenzymes 
B) cofactors 
C) isoenzymes 
D) competitive 
E) noncompetitive 
A) coenzymes 
B) cofactors 
C) isoenzymes 
D) competitive 
E) noncompetitive

Question 14

"Physiological pH", the pH for optimum activity for most enzymes, is a pH equal to

Accepted Answer

A) 3.0. 
B) 5.4. 
C) 7.4. 
D) 8.6. 
E) 9.0. 
A) 3.0. 
B) 5.4. 
C) 7.4. 
D) 8.6. 
E) 9.0.

Question 15

Which of the following is NOT true for a competitive inhibitor?

Accepted Answer

A) It occupies the active site. 
B) It cannot be converted to products. 
C) It has a structure similar to the substrate. 
D) Increasing the substrate concentration can reverse competitive inhibition. 
E) It binds to the enzyme at a site remote from the active site. 
A) It occupies the active site. 
B) It cannot be converted to products. 
C) It has a structure similar to the substrate. 
D) Increasing the substrate concentration can reverse competitive inhibition. 
E) It binds to the enzyme at a site remote from the active site.

Question 16

Penicillin-resistant bacteria can survive treatment with penicillin because they produce the enzyme

Accepted Answer

A) sucrase. 
B) penicillin kinase. 
C) penicillinase. 
D) bacteriase. 
E) phosphate lyase. 
A) sucrase. 
B) penicillin kinase. 
C) penicillinase. 
D) bacteriase. 
E) phosphate lyase.

Question 17

When a substance bonds to an enzyme for reaction, its place of binding is the

Accepted Answer

A) allosteric site. 
B) primary pocket. 
C) end pocket. 
D) primary site. 
E) active site. 
A) allosteric site. 
B) primary pocket. 
C) end pocket. 
D) primary site. 
E) active site.

Question 18

Pepsinogen is an example of a(n)

Accepted Answer

A) coenzyme. 
B) cofactor. 
C) isoenzyme. 
D) allosteric enzyme. 
E) zymogen. 
A) coenzyme. 
B) cofactor. 
C) isoenzyme. 
D) allosteric enzyme. 
E) zymogen.

Question 19

A competitive inhibitor is one that

Accepted Answer

A) binds to the enzyme at a site far from the active site. 
B) binds to the active site in place of the substrate. 
C) destroys the substrate. 
D) binds to the allosteric site on an enzyme. 
E) forms a complex with the substrate. 
A) binds to the enzyme at a site far from the active site. 
B) binds to the active site in place of the substrate. 
C) destroys the substrate. 
D) binds to the allosteric site on an enzyme. 
E) forms a complex with the substrate.

Question 20

In the induced-fit model of enzyme action, the enzyme active site

Accepted Answer

A) stays the same shape during substrate binding. 
B) adjusts shape to adapt to the shape of the substrate. 
C) stays the same shape while causing a change in the shape of the substrate. 
D) uses an inhibitor to adjust its shape for the substrate. 
E) uses a cofactor to change the shape of a substrate. 
A) stays the same shape during substrate binding. 
B) adjusts shape to adapt to the shape of the substrate. 
C) stays the same shape while causing a change in the shape of the substrate. 
D) uses an inhibitor to adjust its shape for the substrate. 
E) uses a cofactor to change the shape of a substrate.

Exam 20: Enzymes and Vitamins

In any reaction catalyzed by an enzyme, the reacting molecule is called the

An enzyme that converts a cis double bond to a trans double bond is classified as a(n) ________.

When a cofactor is a small organic molecule, it is known as a(n)

Indicate whether each of the following is fat soluble or water soluble. -riboflavin

Phosphorylation is a common form of covalent modification.

Identify each of the designated regions on the energy diagram for the conversion of a substrate to product with and without an enzyme. -energy of the substrate

To what main class of enzymes does the enzyme that catalyzes the following reaction belong? Ser - Ala → Ser + Ala

A noncompetitive inhibitor has a structure that

When an end product from an enzyme-mediated sequence is also an inhibitor for an earlier step in the reaction sequence, the process is referred to as

When an end product from an enzyme-mediated sequence is also an inhibitor for an earlier step in the reaction sequence, the process is referred to as

One deficiency disease that can be traced to insufficient intake of vitamin D is ________.

The presence of enzymes to catalyze bioreactions in our bodies allows

Enzymes that catalyze the same reactions but have slightly different structures are called ________.

"Physiological pH", the pH for optimum activity for most enzymes, is a pH equal to

Which of the following is NOT true for a competitive inhibitor?

Penicillin-resistant bacteria can survive treatment with penicillin because they produce the enzyme

When a substance bonds to an enzyme for reaction, its place of binding is the

Pepsinogen is an example of a(n)

A competitive inhibitor is one that

In the induced-fit model of enzyme action, the enzyme active site

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