Question 1

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. E

Question 2

Vitamins are often cofactors.

Accepted Answer

A) True 
 B)False  True

Question 3

"Physiological conditions" for reactions within the body are approximately

Accepted Answer

A) pH 3 and 37 °C. 
B) pH 7 and 37 °C. 
C) pH 7 and 37 °F. 
D) pH 8 and 273 °C. 
E) pH 7 and 273 K. 
A) pH 3 and 37 °C. 
B) pH 7 and 37 °C. 
C) pH 7 and 37 °F. 
D) pH 8 and 273 °C. 
E) pH 7 and 273 K. B

Question 4

Urease is an example of an oxidoreductase enzyme.

Accepted Answer

A) True 
 B)False

Question 5

Iron(II) and iron(III) ions are used in the functioning of

Accepted Answer

A) urease. 
B) alcohol dehydrogenase. 
C) creatine kinase. 
D) the cytochrome oxidase system. 
E) pepsin. 
A) urease. 
B) alcohol dehydrogenase. 
C) creatine kinase. 
D) the cytochrome oxidase system. 
E) pepsin.

Question 6

Allosteric enzymes can control their output of product by

Accepted Answer

A) binding the substrate at a site away from the active site. 
B) binding an irreversible inhibitor at the active site. 
C) binding a positive or negative regulator at a noncompetitive site. 
D) changing the pH in the active site. 
E) reversible inhibition using the product as the inhibitor. 
A) binding the substrate at a site away from the active site. 
B) binding an irreversible inhibitor at the active site. 
C) binding a positive or negative regulator at a noncompetitive site. 
D) changing the pH in the active site. 
E) reversible inhibition using the product as the inhibitor.

Question 7

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

Accepted Answer

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

Question 8

In an enzyme-substrate reaction, when excess substrate is present, increasing the concentration of the enzyme will

Accepted Answer

A) increase the number of substrate molecules available. 
B) inhibit the formation of products. 
C) increase the decomposition rate of the enzyme-substrate complex. 
D) decrease the turnover rate for the substrate. 
E) increase the amount of reaction occurring. 
A) increase the number of substrate molecules available. 
B) inhibit the formation of products. 
C) increase the decomposition rate of the enzyme-substrate complex. 
D) decrease the turnover rate for the substrate. 
E) increase the amount of reaction occurring.

Question 9

The active site of an enzyme

Accepted Answer

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

Question 10

The general function of an enzyme in the body is to

Accepted Answer

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

Question 11

Coenzymes such as water-soluble vitamins are needed in only small amounts because

Accepted Answer

A) only small amounts of enzymes are present in each cell. 
B) only small amounts of substrates are available at any one time. 
C) they can be eliminated in the urine. 
D) each vitamin molecule can be reused many times as a cofactor. 
E) they can be stored in the liver for future use. 
A) only small amounts of enzymes are present in each cell. 
B) only small amounts of substrates are available at any one time. 
C) they can be eliminated in the urine. 
D) each vitamin molecule can be reused many times as a cofactor. 
E) they can be stored in the liver for future use.

Question 12

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

Accepted Answer

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

Question 13

The full name of the enzyme LDH is ________.

Accepted Answer

A) lactate dehydrogenase 
B) liver decompensation hexase 
C) lactate dehydrase 
D) liver dihydrogen kinase 
E) lipase dehydrogenase 
A) lactate dehydrogenase 
B) liver decompensation hexase 
C) lactate dehydrase 
D) liver dihydrogen kinase 
E) lipase dehydrogenase

Question 14

A compound that binds to the surface of an enzyme, and changes its shape so that a substrate cannot enter the active site, is called a(n)

Accepted Answer

A) irreversible inhibitor. 
B) proenzyme. 
C) cofactor. 
D) noncompetitive inhibitor. 
E) competitive inhibitor. 
A) irreversible inhibitor. 
B) proenzyme. 
C) cofactor. 
D) noncompetitive inhibitor. 
E) competitive inhibitor.

Question 15

The formation of an enzyme-substrate complex is the ________ step in enzyme action.

Accepted Answer

A) first 
B) second 
C) third 
D) fourth 
E) last 
A) first 
B) second 
C) third 
D) fourth 
E) last

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

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

Question 19

Another name for a zymogen is a(n) ________.

Accepted Answer

A) cofactor 
B) coenzyme 
C) prosthetic group 
D) isozyme 
E) proenzyme 
A) cofactor 
B) coenzyme 
C) prosthetic group 
D) isozyme 
E) proenzyme

Question 20

Allosteric enzymes can control their output of product by

Accepted Answer

A) binding the substrate at a site away from the active site. 
B) binding an irreversible inhibitor at the active site. 
C) binding a positive or negative regulator at a noncompetitive site. 
D) changing the pH in the active site. 
E) reversible inhibition using the product as the inhibitor. 
A) binding the substrate at a site away from the active site. 
B) binding an irreversible inhibitor at the active site. 
C) binding a positive or negative regulator at a noncompetitive site. 
D) changing the pH in the active site. 
E) reversible inhibition using the product as the inhibitor.

Exam 20: Enzymes and Vitamins

Pepsinogen is an example of a(n)

Vitamins are often cofactors.

"Physiological conditions" for reactions within the body are approximately

Urease is an example of an oxidoreductase enzyme.

Iron(II) and iron(III) ions are used in the functioning of

Allosteric enzymes can control their output of product by

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

In an enzyme-substrate reaction, when excess substrate is present, increasing the concentration of the enzyme will

The active site of an enzyme

The general function of an enzyme in the body is to

Coenzymes such as water-soluble vitamins are needed in only small amounts because

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

The full name of the enzyme LDH is ________.

A compound that binds to the surface of an enzyme, and changes its shape so that a substrate cannot enter the active site, is called a(n)

The formation of an enzyme-substrate complex is the ________ step in enzyme action.

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

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

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

Another name for a zymogen is a(n) ________.

Allosteric enzymes can control their output of product by

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