Question 1

Compared to an uncatalyzed reaction, an enzyme-catalyzed reaction

Accepted Answer

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

Question 2

Identify the type of inhibition in each description.
-The inhibition can be reversed by increasing the concentration of substrate.

Accepted Answer

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

Question 3

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 4

A noncompetitive inhibitor

Accepted Answer

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

Question 5

An increase in concentration of the enzyme LDH in the blood can be used to detect

Accepted Answer

A)  heart attack. 
B)  kidney damage. 
C)  anemia. 
D)  uremia. 
E)  bulimia. 
A)  heart attack. 
B)  kidney damage. 
C)  anemia. 
D)  uremia. 
E)  bulimia.

Question 6

"Physiological pH", the pH for optimum activity for most enzymes, is a pH equal to

Accepted Answer

A)  3.0. 
B)  5.4. 
C)  7.4. 
D)  8.6. 
E)  9.0. 
A)  3.0. 
B)  5.4. 
C)  7.4. 
D)  8.6. 
E)  9.0.

Question 7

Match the vitamin name with its corresponding chemical name.
-vitamin B2

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 8

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

Accepted Answer

A)  The substrate changes its shape so it can bind at 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 changes its shape so it can bind at 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

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 10

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 11

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 12

Match the vitamin name with its corresponding chemical name.
-vitamin B12

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 13

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 14

Match the correct term in enzyme action with each description.
-the temporary combination of an enzyme with the compound on which it acts

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 15

One deficiency disease that can be traced to insufficient intake of vitamin D is __________.

Accepted Answer

A)  scurvy 
B)  rickets 
C)  beriberi 
D)  pellagra 
E)  pernicious anemia 
A)  scurvy 
B)  rickets 
C)  beriberi 
D)  pellagra 
E)  pernicious anemia

Question 16

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 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

Identify the effect of the following on the activity of maltase, an enzyme that hydrolyzes maltose.
-decreasing the concentration of maltose

Accepted Answer

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

Question 19

Urease is an example of an oxidoreductase enzyme.

Accepted Answer

A) True 
 B)False

Question 20

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.

Exam 20: Enzymes and Vitamins

Compared to an uncatalyzed reaction, an enzyme-catalyzed reaction

Identify the type of inhibition in each description. -The inhibition can be reversed by increasing the concentration of substrate.

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

A noncompetitive inhibitor

An increase in concentration of the enzyme LDH in the blood can be used to detect

"Physiological pH", the pH for optimum activity for most enzymes, is a pH equal to

Match the vitamin name with its corresponding chemical name. -vitamin B2

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

Allosteric enzymes can control their output of product by

The full name of the enzyme LDH is __________.

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

Match the vitamin name with its corresponding chemical name. -vitamin B12

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

Match the correct term in enzyme action with each description. -the temporary combination of an enzyme with the compound on which it acts

One deficiency disease that can be traced to insufficient intake of vitamin D is __________.

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

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

Identify the effect of the following on the activity of maltase, an enzyme that hydrolyzes maltose. -decreasing the concentration of maltose

Urease is an example of an oxidoreductase enzyme.

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

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Energy and Matter

Atoms and Elements

Nuclear Chemistry

Compounds and Their Bonds

Chemical Reactions and Quantities

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Reaction Rates and Chemical Equilibrium

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Introduction to Organic Chemistry: Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Phenols, Thiols, and Ethers

Aldehydes, Ketones, and Chiral Molecules

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Match the vitamin name with its corresponding chemical name. -vitamin B₂

Match the vitamin name with its corresponding chemical name. -vitamin B₁₂