Question 1

Inhibition is the irreversible process by which enzymes are rendered nonfunctional.

Accepted Answer

A) True 
 B)False

Question 2

Ethylene glycol (antifreeze)poisoning can be avoided if methanol is administered shortly after ingesting the ethylene glycol.

Accepted Answer

A) True 
 B)False

Question 3

How does a zymogen differ from an apoenzyme?

Accepted Answer

A) An apoenzyme is deactivated by a cofactor. 
B) A zymogen is initially lacking an active site. 
C) A zymogen is activated by removing part of its structure. 
D) An apoenzyme is produced from a holoenzyme + coenzyme 
A) An apoenzyme is deactivated by a cofactor. 
B) A zymogen is initially lacking an active site. 
C) A zymogen is activated by removing part of its structure. 
D) An apoenzyme is produced from a holoenzyme + coenzyme

Question 4

Noncompetitive inhibitors bind strongly to the active site.

Accepted Answer

A) True 
 B)False

Question 5

Feedback inhibition is a type of allosteric regulation.

Accepted Answer

A) True 
 B)False

Question 6

The substrate for the digestive enzyme named sucrase is _____ .

Accepted Answer

A) glucose 
B) fructose 
C) sucrose 
D) more than one response is correct 
A) glucose 
B) fructose 
C) sucrose 
D) more than one response is correct

Question 7

An enzyme is known to catalyze the conversion of proteins to amino acids. Which of the following would be a correct designation for the enzyme?

Accepted Answer

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

Question 8

Cofactors and enzymes form a tightly bound complex without which enzymes will not function.

Accepted Answer

A) True 
 B)False

Question 9

What type of enzyme would catalyze the following reaction?

Accepted Answer

A) ligase 
B) oxidoreductase 
C) isomerase 
D) transferase 
A) ligase 
B) oxidoreductase 
C) isomerase 
D) transferase

Question 10

Heavy metal ions are believed to act as ____ inhibitors.

Accepted Answer

A) reversible 
B) irreversible 
C) competitive 
D) noncompetitive 
A) reversible 
B) irreversible 
C) competitive 
D) noncompetitive

Question 11

The enzyme model that accounts for molecule flexibility is

Accepted Answer

A) lock and key. 
B) induced fit. 
C) allosteric effects. 
D) More than one answer is correct. 
A) lock and key. 
B) induced fit. 
C) allosteric effects. 
D) More than one answer is correct.

Question 12

Which of the following is a (are)zymogen(s)?

Accepted Answer

A) pepsin 
B) chymotrypsinogen 
C) carboxypeptidase 
D) all are zymogens 
A) pepsin 
B) chymotrypsinogen 
C) carboxypeptidase 
D) all are zymogens

Question 13

The theory that proposes a somewhat flexible enzyme conformation is the

Accepted Answer

A) lock-and-key theory. 
B) induced-fit theory. 
C) physically-fit theory. 
D) expanding-fit theory. 
A) lock-and-key theory. 
B) induced-fit theory. 
C) physically-fit theory. 
D) expanding-fit theory.

Question 14

Which of the following terms is a general definition of an enzyme?

Accepted Answer

A) catalyst 
B) lipid 
C) carbohydrate 
D) activator 
A) catalyst 
B) lipid 
C) carbohydrate 
D) activator

Question 15

____ would be considered as a common rate of chemical reaction measure per minute due to the presence of an enzyme.

Accepted Answer

A) 100 
B) 1,000 
C) 10,000 
D) 100,000 
A) 100 
B) 1,000 
C) 10,000 
D) 100,000

Question 16

Which of the following enzyme types have proven especially useful in diagnostic medicine?

Accepted Answer

A) allosteric enzyme 
B) proenzymes 
C) isoenzymes 
D) induced enzymes 
A) allosteric enzyme 
B) proenzymes 
C) isoenzymes 
D) induced enzymes

Question 17

The toxicity of cyanide is due to its affinity for the

Accepted Answer

A) − SH groups of enzymes. 
B) carboxyl groups of active sites. 
C) iron atoms of cytochrome oxidase. 
D) amino groups of hemoglobin. 
A) − SH groups of enzymes. 
B) carboxyl groups of active sites. 
C) iron atoms of cytochrome oxidase. 
D) amino groups of hemoglobin.

Question 18

Enzymes have specific temperature and pH ranges within which they function best.

Accepted Answer

A) True 
 B)False

Question 19

The EC name of an enzyme is alanine transaminase.  This indicates that

Accepted Answer

A) the substrate is alanine. 
B) the functional group is an amine. 
C) the type of reaction is a transfer. 
D) All of these. 
A) the substrate is alanine. 
B) the functional group is an amine. 
C) the type of reaction is a transfer. 
D) All of these.

Question 20

The measurement of various enzymes in the blood have been found to be useful for diagnosing pathological conditions.  Which of the following enzymes is used to detect bone disease?

Accepted Answer

A) creatine kinase 
B) aspartate transaminase 
C) lactate dehydrogenase 
D) alkaline phosphatase 
A) creatine kinase 
B) aspartate transaminase 
C) lactate dehydrogenase 
D) alkaline phosphatase

Exam 20: Enzymes

Inhibition is the irreversible process by which enzymes are rendered nonfunctional.

Ethylene glycol (antifreeze)poisoning can be avoided if methanol is administered shortly after ingesting the ethylene glycol.

How does a zymogen differ from an apoenzyme?

Noncompetitive inhibitors bind strongly to the active site.

Feedback inhibition is a type of allosteric regulation.

The substrate for the digestive enzyme named sucrase is _____ .

An enzyme is known to catalyze the conversion of proteins to amino acids. Which of the following would be a correct designation for the enzyme?

Cofactors and enzymes form a tightly bound complex without which enzymes will not function.

What type of enzyme would catalyze the following reaction?

Heavy metal ions are believed to act as ____ inhibitors.

The enzyme model that accounts for molecule flexibility is

Which of the following is a (are)zymogen(s)?

The theory that proposes a somewhat flexible enzyme conformation is the

Which of the following terms is a general definition of an enzyme?

____ would be considered as a common rate of chemical reaction measure per minute due to the presence of an enzyme.

Which of the following enzyme types have proven especially useful in diagnostic medicine?

The toxicity of cyanide is due to its affinity for the

Enzymes have specific temperature and pH ranges within which they function best.

The EC name of an enzyme is alanine transaminase. This indicates that

The measurement of various enzymes in the blood have been found to be useful for diagnosing pathological conditions. Which of the following enzymes is used to detect bone disease?

Matter, Measurements, and Calculations

Atoms and Molecules

Electronic Structure and the Periodic Law

Forces Between Particles

Chemical Reactions

The States of Matter

Solutions and Colloids

Reaction Rates and Equilibrium

Acids, Bases, and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

Alcohols, Phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Carbohydrates

Lipids

Proteins

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

Body Fluids

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