Question 1

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

Accepted Answer

A) 2.0 
B) 4.0 
C) 6.5 
D) 7.4 
E) 8.0 
A) 2.0 
B) 4.0 
C) 6.5 
D) 7.4 
E) 8.0

Question 2

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

Accepted Answer

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

Question 3

An irreversible inhibitor is one that

Accepted Answer

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

Question 4

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

Accepted Answer

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

Question 5

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 product

Accepted Answer

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

Question 6

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

Accepted Answer

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

Question 7

Insulin and digestive enzymes are produced as inactive forms called zymogens.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following is NOT a step in the enzyme-catalyzed conversion of a substrate to product?

Accepted Answer

A) The substrate binds to the enzyme away from the active site. 
B) The substrate binds in the active site to form the E-S complex. 
C) The enzyme assists in the conversion of the substrate to product. 
D) The product is released from the active site. 
E) A new substrate molecule binds to the enzyme for a new cycle. 
A) The substrate binds to the enzyme away from the active site. 
B) The substrate binds in the active site to form the E-S complex. 
C) The enzyme assists in the conversion of the substrate to product. 
D) The product is released from the active site. 
E) A new substrate molecule binds to the enzyme for a new cycle.

Question 9

Penicillin functions as an antibiotic by

Accepted Answer

A) poisoning bacteria with toxins. 
B) raising the temperature of a bacterium. 
C) bonding to metal ions in bacterial electron transport systems. 
D) inhibiting the enzymes for cell wall formation in bacteria. 
E) acting as an acetylcholinesterase inhibitor. 
A) poisoning bacteria with toxins. 
B) raising the temperature of a bacterium. 
C) bonding to metal ions in bacterial electron transport systems. 
D) inhibiting the enzymes for cell wall formation in bacteria. 
E) acting as an acetylcholinesterase inhibitor.

Question 10

The optimum temperature for sucrase activity is 37 °C. The hydrolysis of sucrose is slowest at which temperature in the choices below?

Accepted Answer

A) 0 °C 
B) 10 °C 
C) 20 °C 
D) 25 °C 
E) 45 °C 
A) 0 °C 
B) 10 °C 
C) 20 °C 
D) 25 °C 
E) 45 °C

Question 11

Enzyme cofactors are always metal ions, such as Zn2+ and Fe3+.

Accepted Answer

A) True 
 B)False

Question 12

The function of the enzyme-substrate complex is to provide an alternative reaction pathway that

Accepted Answer

A) lowers the energy of the products. 
B) lowers the energy of the substrate. 
C) changes the concentration of the substrate. 
D)  decreases the activation energy for the reaction. 
E) changes the possible product formed. 
A) lowers the energy of the products. 
B) lowers the energy of the substrate. 
C) changes the concentration of the substrate. 
D)  decreases the activation energy for the reaction. 
E) changes the possible product formed.

Question 13

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

Accepted Answer

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

Question 14

Most enzymes are

Accepted Answer

A) fluid-mosaic proteins. 
B) induced proteins. 
C) substrate proteins. 
D) fibrous proteins. 
E) globular proteins. 
A) fluid-mosaic proteins. 
B) induced proteins. 
C) substrate proteins. 
D) fibrous proteins. 
E) globular proteins.

Question 15

The B vitamins are examples of

Accepted Answer

A) water-soluble vitamins. 
B) essential amino acids. 
C) essential minerals. 
D) oil soluble vitamins. 
E) vitamins that are stored in the liver. 
A) water-soluble vitamins. 
B) essential amino acids. 
C) essential minerals. 
D) oil soluble vitamins. 
E) vitamins that are stored in the liver.

Question 16

A diet very low in vitamin C can lead over time to the condition ________.

Accepted Answer

A) rickets 
B) scurvy 
C) cancer 
D) carpal tunnel syndrome 
E) anorexia nervosa 
A) rickets 
B) scurvy 
C) cancer 
D) carpal tunnel syndrome 
E) anorexia nervosa

Question 17

Most enzymes are deactivated permanently above a temperature of about

Accepted Answer

A) 25 °C. 
B) 37 °F. 
C) 40 °C. 
D) 45 °F. 
E) 50 °C. 
A) 25 °C. 
B) 37 °F. 
C) 40 °C. 
D) 45 °F. 
E) 50 °C.

Question 18

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 without the enzyme

Accepted Answer

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

Question 19

How many generalized steps are there in the reaction of an enzyme (E) with a substrate (S) to form and release the product (P)?

Accepted Answer

A) one 
B) two 
C) three 
D) four 
E) five 
A) one 
B) two 
C) three 
D) four 
E) five

Question 20

Creatine kinase can be used in the diagnosis of

Accepted Answer

A) hepatitis. 
B) rickets. 
C) heart attack. 
D) prostatitis. 
E) cancer. 
A) hepatitis. 
B) rickets. 
C) heart attack. 
D) prostatitis. 
E) cancer.

Exam 20: Enzymes and Vitamins

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

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

An irreversible inhibitor is one that

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

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 product

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

Insulin and digestive enzymes are produced as inactive forms called zymogens.

Which of the following is NOT a step in the enzyme-catalyzed conversion of a substrate to product?

Penicillin functions as an antibiotic by

The optimum temperature for sucrase activity is 37 °C. The hydrolysis of sucrose is slowest at which temperature in the choices below?

Enzyme cofactors are always metal ions, such as Zn2+ and Fe3+.

The function of the enzyme-substrate complex is to provide an alternative reaction pathway that

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

Most enzymes are

The B vitamins are examples of

A diet very low in vitamin C can lead over time to the condition ________.

Most enzymes are deactivated permanently above a temperature of about

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 without the enzyme

How many generalized steps are there in the reaction of an enzyme (E) with a substrate (S) to form and release the product (P)?

Creatine kinase can be used in the diagnosis of

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Enzyme cofactors are always metal ions, such as Zn²⁺ and Fe³⁺.