Question 1

An enzyme that converts a cis double bond to a trans double bond is classified as a(n) __________.

Accepted Answer

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

Question 2

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

Accepted Answer

water soluble

Question 3

Match the vitamin name with its corresponding chemical name.
-vitamin B3

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 B

Question 4

Enzymes that catalyze the same reactions but have slightly different structures are called __________.

Accepted Answer

A)  coenzymes 
B)  cofactors 
C)  isoenzymes 
D)  competitive 
E)  noncompetitive 
A)  coenzymes 
B)  cofactors 
C)  isoenzymes 
D)  competitive 
E)  noncompetitive

Question 5

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

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 6

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 7

Match the correct term in enzyme action with each description.
-an organic compound that is sometimes needed to complete an enzyme

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 8

A biological catalyst is called a(n) __________.

Accepted Answer

A)  lipid 
B)  enzyme 
C)  cofactor 
D)  coenzyme 
E)  substrate 
A)  lipid 
B)  enzyme 
C)  cofactor 
D)  coenzyme 
E)  substrate

Question 9

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 10

Identify the effect of the following on the activity of maltase, an enzyme that hydrolyzes maltose.
-one theory that accounts for the unusual specificity of an enzyme

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 11

"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.

Question 12

Urea is converted to ammonia and carbon dioxide by the action of urease. What will be the effect on the rate if the temperature of the reaction is lowered from 37 °C (the optimum temperature) to 27 °C?

Accepted Answer

A)  There will be no effect. 
B)  The rate will slow down. 
C)  The rate will double. 
D)  The rate will triple. 
E)  The rate will slow down, then speed up again. 
A)  There will be no effect. 
B)  The rate will slow down. 
C)  The rate will double. 
D)  The rate will triple. 
E)  The rate will slow down, then speed up again.

Question 13

The surface of a freshly cut apple turns brown because of

Accepted Answer

A)  inhibition of the surface enzymes by nitrogen. 
B)  interaction of the surface enzymes with oxygen. 
C)  a change in pH at the surface. 
D)  an increase in substrate concentration at the cut surface. 
E)  the presence of vitamin C in the apple. 
A)  inhibition of the surface enzymes by nitrogen. 
B)  interaction of the surface enzymes with oxygen. 
C)  a change in pH at the surface. 
D)  an increase in substrate concentration at the cut surface. 
E)  the presence of vitamin C in the apple.

Question 14

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.

Question 15

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 16

In any reaction catalyzed by an enzyme, the reacting molecule is called the

Accepted Answer

A)  substrate. 
B)  cofactor. 
C)  coenzyme. 
D)  isozyme. 
E)  allostere. 
A)  substrate. 
B)  cofactor. 
C)  coenzyme. 
D)  isozyme. 
E)  allostere.

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.  
-energy of the product

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.
-increasing the concentration of maltase (enzyme) when the enzyme is saturated with substrate

Accepted Answer

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

Question 19

To what main class of enzymes does the enzyme that catalyzes the following reaction belong?

Accepted Answer

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

Question 20

Indicate whether each of the following is fat soluble or water soluble.
-vitamin B6

Accepted Answer

Exam 20: Enzymes and Vitamins

An enzyme that converts a cis double bond to a trans double bond is classified as a(n) __________.

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

Match the vitamin name with its corresponding chemical name. -vitamin B3

Enzymes that catalyze the same reactions but have slightly different structures are called __________.

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

The general function of an enzyme in the body is to

Match the correct term in enzyme action with each description. -an organic compound that is sometimes needed to complete an enzyme

A biological catalyst is called a(n) __________.

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)

Identify the effect of the following on the activity of maltase, an enzyme that hydrolyzes maltose. -one theory that accounts for the unusual specificity of an enzyme

"Physiological conditions" for reactions within the body are approximately

Urea is converted to ammonia and carbon dioxide by the action of urease. What will be the effect on the rate if the temperature of the reaction is lowered from 37 °C (the optimum temperature) to 27 °C?

The surface of a freshly cut apple turns brown because of

Creatine kinase can be used in the diagnosis of

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

In any reaction catalyzed by an enzyme, the reacting molecule is called the

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

Identify the effect of the following on the activity of maltase, an enzyme that hydrolyzes maltose. -increasing the concentration of maltase (enzyme) when the enzyme is saturated with substrate

To what main class of enzymes does the enzyme that catalyzes the following reaction belong?

Indicate whether each of the following is fat soluble or water soluble. -vitamin B6

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

Match the vitamin name with its corresponding chemical name. -vitamin B₃

Indicate whether each of the following is fat soluble or water soluble. -vitamin B₆