Question 1

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

Accepted Answer

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

Question 2

To what main class of enzymes does the enzyme that catalyzes the conversion of lactose to galactose and glucose belong?

Accepted Answer

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

Question 3

The active site of an enzyme

Accepted Answer

A) is where the substrate is held as the reaction takes place. 
B) increases the energy of reaction. 
C) is remote from the site of substrate attachment. 
D) is converted to a product. 
E) includes the entire enzyme. 
A) is where the substrate is held as the reaction takes place. 
B) increases the energy of reaction. 
C) is remote from the site of substrate attachment. 
D) is converted to a product. 
E) includes the entire enzyme.

Question 4

An irreversible inhibitor is one that

Accepted Answer

A) binds to the enzyme with hydrophobic interactions. 
B) binds covalently to the enzyme active site. 
C) reacts covalently with a cofactor. 
D) reacts covalently with the substrate. 
E) forms hydrogen bonds with the substrate. 
A) binds to the enzyme with hydrophobic interactions. 
B) binds covalently to the enzyme active site. 
C) reacts covalently with a cofactor. 
D) reacts covalently with the substrate. 
E) forms hydrogen bonds with the substrate.

Question 5

The water-soluble B and C vitamins supply

Accepted Answer

A) essential fatty acids. 
B) essential amino acids. 
C) coenzymes required by some enzymes. 
D) competitive inhibitors needed to regulate enzyme activity. 
E) substrates necessary for most of the reactions in the body. 
A) essential fatty acids. 
B) essential amino acids. 
C) coenzymes required by some enzymes. 
D) competitive inhibitors needed to regulate enzyme activity. 
E) substrates necessary for most of the reactions in the body.

Question 6

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

Accepted Answer

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

Question 7

Vitamin D is an example of a(n)

Accepted Answer

A) must be obtained from the diet daily. 
B) fat soluble vitamin. 
C) water-soluble vitamin. 
D) essential mineral. 
E) essential amino acid. 
A) must be obtained from the diet daily. 
B) fat soluble vitamin. 
C) water-soluble vitamin. 
D) essential mineral. 
E) essential amino acid.

Question 8

A competitive inhibitor is one that

Accepted Answer

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

Question 9

Hexokinase catalyzes only the addition of phosphate to any hexose sugar. This type of activity is called

Accepted Answer

A) general specificity. 
B) noncompetitive specificity. 
C) group specificity. 
D) collateral specificity. 
E) regional specificity. 
A) general specificity. 
B) noncompetitive specificity. 
C) group specificity. 
D) collateral specificity. 
E) regional specificity.

Question 10

Compared to an uncatalyzed reaction, an enzyme-catalyzed reaction

Accepted Answer

A) occurs at a faster rate. 
B) uses less substrate. 
C) requires more energy. 
D) requires a higher temperature. 
E) produces different products. 
A) occurs at a faster rate. 
B) uses less substrate. 
C) requires more energy. 
D) requires a higher temperature. 
E) produces different products.

Question 11

The names of many enzymes can be recognized by the suffix ________.

Accepted Answer

A) -ite 
B) -ine 
C) -ose 
D) -ate 
E) -ase 
A) -ite 
B) -ine 
C) -ose 
D) -ate 
E) -ase

Question 12

A noncompetitive inhibitor

Accepted Answer

A) binds at the active site of the enzyme. 
B) alters the three-dimensional structure of the enzyme. 
C) has its effect reversed by adding more substrate. 
D) has a structure similar to the substrate. 
E) increases the rate of the enzyme-catalyzed reaction. 
A) binds at the active site of the enzyme. 
B) alters the three-dimensional structure of the enzyme. 
C) has its effect reversed by adding more substrate. 
D) has a structure similar to the substrate. 
E) increases the rate of the enzyme-catalyzed reaction.

Question 13

The general function of an enzyme in the body is to

Accepted Answer

A) eliminate waste products from the blood. 
B) catalyze chemical reactions. 
C) maintain a neutral pH. 
D) act as a reactant in carbohydrate storage. 
E) maintain homeostasis. 
A) eliminate waste products from the blood. 
B) catalyze chemical reactions. 
C) maintain a neutral pH. 
D) act as a reactant in carbohydrate storage. 
E) maintain homeostasis.

Question 14

An enzyme that removes H from a substrate is classified as a(n)________.

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

The optimum pH for the activity of pepsin is about ________.

Accepted Answer

A) 6.5 
B) 7.4 
C) 7.6 
D) 4.0 
E) 2.0 
A) 6.5 
B) 7.4 
C) 7.6 
D) 4.0 
E) 2.0

Question 17

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

Accepted Answer

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

Question 18

Substrates are usually bond to the active site of an enzyme by

Accepted Answer

A) pH changes. 
B) ester bonds. 
C) the side chains of amino acids in the enzyme protein. 
D) competitive inhibition. 
E) peptide bonds. 
A) pH changes. 
B) ester bonds. 
C) the side chains of amino acids in the enzyme protein. 
D) competitive inhibition. 
E) peptide bonds.

Question 19

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

Accepted Answer

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

Question 20

Pepsinogen is an example of a(n)

Accepted Answer

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

Exam 20: Enzymes and Vitamins

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

To what main class of enzymes does the enzyme that catalyzes the conversion of lactose to galactose and glucose belong?

The active site of an enzyme

An irreversible inhibitor is one that

The water-soluble B and C vitamins supply

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

Vitamin D is an example of a(n)

A competitive inhibitor is one that

Hexokinase catalyzes only the addition of phosphate to any hexose sugar. This type of activity is called

Compared to an uncatalyzed reaction, an enzyme-catalyzed reaction

The names of many enzymes can be recognized by the suffix ________.

A noncompetitive inhibitor

The general function of an enzyme in the body is to

An enzyme that removes H from a substrate is classified as a(n)________.

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

The optimum pH for the activity of pepsin is about ________.

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

Substrates are usually bond to the active site of an enzyme by

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

Pepsinogen is an example of a(n)

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