Question 1

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 2

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 3

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 4

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 5

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 6

Enzyme cofactors are always metal ions, such as ZN2+ and Fe3+.

Accepted Answer

A) True 
 B)False

Question 7

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 8

Different forms of an enzyme that catalyze the same reaction in different tissues are called __________.

Accepted Answer

A)  isomers 
B)  allosteres 
C)  coenzymes 
D)  prozymes 
E)  isoenzymes 
A)  isomers 
B)  allosteres 
C)  coenzymes 
D)  prozymes 
E)  isoenzymes

Question 9

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.

Question 10

The hydrolysis of ester bonds in triglycerides is catalyzed by a(n)

Accepted Answer

A)  lipase. 
B)  lyase. 
C)  isomerase. 
D)  hydrolase. 
E)  oxidoreductase. 
A)  lipase. 
B)  lyase. 
C)  isomerase. 
D)  hydrolase. 
E)  oxidoreductase.

Question 11

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 12

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 13

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 14

Match the vitamin name with its corresponding chemical name.
-vitamin B1

Accepted Answer

A) ascorbic acid 
B) niacin 
C) thiamine pyrophosphate or thiamine 
D) cobalamin 
E) pyridoxine
F)cholecalciferol
G)riboflavin 
A) ascorbic acid 
B) niacin 
C) thiamine pyrophosphate or thiamine 
D) cobalamin 
E) pyridoxine
F)cholecalciferol
G)riboflavin

Question 15

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 16

Identify the type of inhibition in each description.
-an inhibitor that resembles the structure of the substrate

Accepted Answer

A) noncompetitive 
B) competitive 
A) noncompetitive 
B) competitive

Question 17

Identify the type of inhibition in each description.
-lowering the pH to 1.0

Accepted Answer

A) decreases 
B) increases 
C) has no effect 
A) decreases 
B) increases 
C) has no effect

Question 18

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 19

Match the correct term in enzyme action with each description.
-the portion of an enzyme molecule where catalytic activity occurs

Accepted Answer

A) cofactor 
B) lock-and-key theory 
C) enzyme-substrate complex 
D) active site 
E) coenzyme 
A) cofactor 
B) lock-and-key theory 
C) enzyme-substrate complex 
D) active site 
E) coenzyme

Question 20

Metal ions such as ZN₂+ and Fe3+ are often needed by enzymes as

Accepted Answer

A)  isozymes. 
B)  allosteres. 
C)  inhibitors. 
D)  cofactors. 
E)  substrates. 
A)  isozymes. 
B)  allosteres. 
C)  inhibitors. 
D)  cofactors. 
E)  substrates.

Exam 20: Enzymes and Vitamins

A competitive inhibitor is one that

A noncompetitive inhibitor has a structure that

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

The presence of enzymes to catalyze bioreactions in our bodies allows

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

Enzyme cofactors are always metal ions, such as ZN2+ and Fe3+.

Penicillin functions as an antibiotic by

Different forms of an enzyme that catalyze the same reaction in different tissues are called __________.

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

The hydrolysis of ester bonds in triglycerides is catalyzed by a(n)

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

The B vitamins are examples of

An irreversible inhibitor is one that

Match the vitamin name with its corresponding chemical name. -vitamin B1

Most enzymes are deactivated permanently above a temperature of about

Identify the type of inhibition in each description. -an inhibitor that resembles the structure of the substrate

Identify the type of inhibition in each description. -lowering the pH to 1.0

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

Match the correct term in enzyme action with each description. -the portion of an enzyme molecule where catalytic activity occurs

Metal ions such as ZN₂+ and Fe3+ are often needed by enzymes as

Chemistry and Measurements

Energy and Matter

Atoms and Elements

Nuclear Chemistry

Compounds and Their Bonds

Chemical Reactions and Quantities

Gases

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Introduction to Organic Chemistry: Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Phenols, Thiols, and Ethers

Aldehydes, Ketones, and Chiral Molecules

Carbohydrates

Carboxylic Acids and Esters

Lipids

Amines and Amides

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Metabolic Pathways for Carbohydrates

Metabolism and Energy Production

Metabolic Pathways for Lipids and Amino Acids

Filters

Enzyme cofactors are always metal ions, such as ZN²⁺ and Fe³⁺.

Match the vitamin name with its corresponding chemical name. -vitamin B₁

Metal ions such as ZN₂+ and Fe³⁺ are often needed by enzymes as