Download C) the gain of electrons.

Oxidation typically involves:
A) the loss of electrons.
B) the loss of oxygen.
C) the gain of electrons.
D) the gain of water.
E) none of the above
Oxidation typically involves:
A) the loss of electrons.
B) the loss of oxygen.
C) the gain of electrons.
D) the gain of water.
E) none of the above
Reduction typically involves:
A) the loss of electrons.
B) the gain of oxygen.
C) the gain of electrons.
D) the gain of water.
E) none of the above
Reduction typically involves:
A) the loss of electrons.
B) the gain of oxygen.
C) the gain of electrons.
D) the gain of water.
E) none of the above
The reducing agent typically:
A) gains electrons.
B) always remains unchanged during a reaction.
C) is the oxidized substance.
D) is itself reduced.
E) none of the above
The reducing agent typically:
A) gains electrons.
B) always remains unchanged during a reaction.
C) is the oxidized substance.
D) is itself reduced.
E) none of the above
The oxidizing agent typically:
A) loses electrons.
B) gains oxygen.
C) is the reactant that is reduced.
D) is oxidized.
E) none of the above
The oxidizing agent typically:
A) loses electrons.
B) gains oxygen.
C) is the reactant that is reduced.
D) is oxidized.
E) none of the above
Oxidation involves which of the following?
1. Loss of electron(s).
2. Gain of electron(s).
3. Increase in oxidation state.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 3 only
E) 2 and 3 only
Oxidation involves which of the following?
1. Loss of electron(s).
2. Gain of electron(s).
3. Increase in oxidation state.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 3 only
E) 2 and 3 only
Reduction involves which of the following?
1. Loss of electron(s).
2. Gain of electron(s).
3. Decrease in oxidation state.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 2 only
E) 2 and 3 only
Reduction involves which of the following?
1. Loss of electron(s).
2. Gain of electron(s).
3. Decrease in oxidation state.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 2 only
E) 2 and 3 only
In the reaction Zn(s) + Fe2+(aq) → Zn2+(aq) + Fe(s)
A.Electrons are transferred from Zn to Zn2+
B.Electrons are transferred from Fe2+ to Fe.
C.Electrons are transferred from Fe to Zn2+
D.Electrons are transferred from Zn to Fe2+
In the reaction Zn(s) + Fe2+(aq) → Zn2+(aq) + Fe(s)
A.Electrons are transferred from Zn to Zn2+
B.Electrons are transferred from Fe2+ to Fe.
C.Electrons are transferred from Fe to Zn2+
D.Electrons are transferred from Zn to Fe2+
Identify the substance being oxidized in the following
reaction:
CH4 + 2O2  CO2 + 2H2O.
A) CH4
B) O2
C) CO2
D) H2O
E) none of the above
Identify the substance being oxidized in the following
reaction:
CH4 + 2O2  CO2 + 2H2O.
A) CH4
B) O2
C) CO2
D) H2O
E) none of the above
Identify the substance being reduced in the following
reaction:
CH4 + 2O2  CO2 + 2H2O.
A) CH4
B) O2
C) CO2
D) H2O
E) none of the above
Identify the substance being reduced in the following
reaction:
CH4 + 2O2  CO2 + 2H2O.
A) CH4
B) O2
C) CO2
D) H2O
E) none of the above
Identify the reducing agent in the following reaction:
CH4 + 2O2  CO2 + 2H2O.
A) CH4
B) O2
C) CO2
D) H2O
E) none of the above
Identify the reducing agent in the following reaction:
CH4 + 2O2  CO2 + 2H2O.
A) CH4
B) O2
C) CO2
D) H2O
E) none of the above
Identify the oxidizing agent in the following reaction:
CH4 + 2O2  CO2 + 2H2O.
A) CH4
B) O2
C) CO2
D) H2O
E) none of the above
Identify the oxidizing agent in the following reaction:
CH4 + 2O2  CO2 + 2H2O.
A) CH4
B) O2
C) CO2
D) H2O
E) none of the above
In the following “redox” reaction,
Zn (s) + CuSO4 (aq) → ZnSO4 (aq) + Cu (s)
A) Zn is the reducing agent and CuSO4 is the oxidizing agent.
B) CuSO4 is the reducing agent and Zn is the oxidizing agent.
C) ZnSO4 is the reducing agent and Cu is the oxidizing agent.
D) Cu2+ is the reducing agent and Zn2+ is the oxidizing agent.
E) none of the above
In the following “redox” reaction,
Zn (s) + CuSO4 (aq) → ZnSO4 (aq) + Cu (s)
A) Zn is the reducing agent and CuSO4 is the oxidizing agent.
B) CuSO4 is the reducing agent and Zn is the oxidizing agent.
C) ZnSO4 is the reducing agent and Cu is the oxidizing agent.
D) Cu2+ is the reducing agent and Zn2+ is the oxidizing agent.
E) none of the above
Many names for enzymes end in the suffix
A. acid
B. ose
C. ase
D. hyde
Many names for enzymes end in the suffix
A. acid
B. ose
C. ase
D. hyde
What is the general function of enzymes within a
cell?
A) to promote the synthesis of monomers
B) to induce chemical reactions
C) to stop chemical reactions
D) to speed up chemical reactions
What is the general function of enzymes within a
cell?
A) to promote the synthesis of monomers
B) to induce chemical reactions
C) to stop chemical reactions
D) to speed up chemical reactions
A child is brought to the hospital with a fever of 107°F. Doctors
immediately order an ice bath to lower the child's temperature. Which
of the following statements offers the most logical explanation for this
action?
A)Elevated body temperature will increase reaction rates in the child's
cells and overload the limited number of enzymes found in the cell.
B) Elevated body temperatures may denature enzymes. This would
interfere with the cell's abilities to catalyze various reactions.
C) Elevated body temperatures will increase the energy of activation
needed to start various chemical reactions in the body. This will
interfere with the ability of enzymes to catalyze vital chemical
reactions.
D) Elevated body temperatures cause molecules to vibrate more
quickly and prevent enzymes from easily attaching to reactants. This
would slow vital body reactions.
A child is brought to the hospital with a fever of 107°F. Doctors
immediately order an ice bath to lower the child's temperature. Which
of the following statements offers the most logical explanation for this
action?
A)Elevated body temperature will increase reaction rates in the child's
cells and overload the limited number of enzymes found in the cell.
B) Elevated body temperatures may denature enzymes. This would
interfere with the cell's abilities to catalyze various reactions.
C) Elevated body temperatures will increase the energy of activation
needed to start various chemical reactions in the body. This will
interfere with the ability of enzymes to catalyze vital chemical
reactions.
D) Elevated body temperatures cause molecules to vibrate more
quickly and prevent enzymes from easily attaching to reactants. This
would slow vital body reactions.
The chemical reaction below depicts the hydrolysis of the
disaccharide sucrose into two monosaccharides as
catalyzed by the enzyme sucrase.
Sucrose --> Fructose + Glucose.
What is/are the “substrate” for this reaction
A) Sucrose
B) Sucrase
C) Fructose
D) Glucose
E) C and D
The chemical reaction below depicts the hydrolysis of the
disaccharide sucrose into two monosaccharides as
catalyzed by the enzyme sucrase.
Sucrose --> Fructose + Glucose.
What is/are the “substrate” for this reaction
A) Sucrose
B) Sucrase
C) Fructose
D) Glucose
E) C and D
The chemical reaction below depicts the hydrolysis of the
disaccharide sucrose into two monosaccharides as
catalyzed by the enzyme sucrase.
Sucrose --> Fructose + Glucose.
What is/are the “product” for this reaction
A) Sucrose
B) Sucrase
C) Fructose
D) Glucose
E) C and D
The chemical reaction below depicts the hydrolysis of the
disaccharide sucrose into two monosaccharides as
catalyzed by the enzyme sucrase.
Sucrose --> Fructose + Glucose.
What is/are the “product” for this reaction
A) Sucrose
B) Sucrase
C) Fructose
D) Glucose
E) C and D
Substrates bind to an enzyme's ________ site.
A) allosteric
B) inhibitory
C) phosphate
D) active
Substrates bind to an enzyme's ________ site.
A) allosteric
B) inhibitory
C) phosphate
D) active
The effect of temperature on the relative rate of
action of an enzyme is represented in the graph
below.
The optimum temperature for the action of this
enzyme is approximately
a. 15◦C
b. 22◦C
c. 37◦C
d. 50◦C
The effect of temperature on the relative rate of
action of an enzyme is represented in the graph
below.
The optimum temperature for the action of this
enzyme is approximately
a. 15◦C
b. 22◦C
c. 37◦C
d. 50◦C
Use the diagram below to answer the question.
Identify the parts involved.
A.A and B are enzymes and C is the substrate
B.C is the enzyme and A and B are the substrates.
C.A is the enzyme, B is the monomer and C is the polymer
D.A and B are the substrates and C is the polymer
Use the diagram below to answer the question.
Identify the parts involved.
A.A and B are enzymes and C is the substrate
B.C is the enzyme and A and B are the substrates.
C.A is the enzyme, B is the monomer and C is the polymer
D.A and B are the substrates and C is the polymer
The enzyme salivary amylase will act on starch
but not on protein. This action illustrates that
salivary amylase
A. contains starch
B. is not reusable
C. is substrate specific
D. lacks protein
The enzyme salivary amylase will act on starch
but not on protein. This action illustrates that
salivary amylase
A. contains starch
B. is not reusable
C. is substrate specific
D. lacks protein
A person may become lactose intolerant if their
intestinal glands do not produce enough
A. maltase enzyme
B. lactase enzyme
C. lactose enzyme
D. maltose enzyme
A person may become lactose intolerant if their
intestinal glands do not produce enough
A. maltase enzyme
B. lactase enzyme
C. lactose enzyme
D. maltose enzyme
When an enzyme catalyzes a reaction,
A) it lowers the activation energy of the reaction.
B) it raises the activation energy of the reaction.
C) it acts as a reactant.
D) it is used once and discarded.
When an enzyme catalyzes a reaction,
A) it lowers the activation energy of the reaction.
B) it raises the activation energy of the reaction.
C) it acts as a reactant.
D) it is used once and discarded.
Which of the following statements regarding
enzymes is true?
A) Enzymes are inorganic.
B) An enzyme's function is unaffected by changes
in pH.
C) Enzymes catalyze specific reactions.
D) Enzymes slow down the rate of a chemical
reaction.
Which of the following statements regarding
enzymes is true?
A) Enzymes are inorganic.
B) An enzyme's function is unaffected by changes
in pH.
C) Enzymes catalyze specific reactions.
D) Enzymes slow down the rate of a chemical
reaction.
Heating inactivates enzymes by
A) breaking the covalent bonds that hold the
molecule together.
B) removing phosphate groups from the enzyme.
C) causing enzyme molecules to stick together.
D) changing the enzyme's three-dimensional
shape.
Heating inactivates enzymes by
A) breaking the covalent bonds that hold the
molecule together.
B) removing phosphate groups from the enzyme.
C) causing enzyme molecules to stick together.
D) changing the enzyme's three-dimensional
shape.
The active site of an enzyme is
A) the region of a substrate that is changed by an
enzyme.
B) the highly changeable portion of an enzyme
that adapts to fit the substrates of various
reactions.
C) the region of an enzyme that attaches to a
substrate.
D) the region of a product that detaches from the
enzyme.
The active site of an enzyme is
A) the region of a substrate that is changed by an
enzyme.
B) the highly changeable portion of an enzyme
that adapts to fit the substrates of various
reactions.
C) the region of an enzyme that attaches to a
substrate.
D) the region of a product that detaches from the
enzyme.
Which of the following characteristics of protein
will remain intact if the protein is denatured?
A) the shape of the protein
B) the function of the protein
C) the number of amino acids in the protein
D) the binding properties of the protein
Which of the following characteristics of protein
will remain intact if the protein is denatured?
A) the shape of the protein
B) the function of the protein
C) the number of amino acids in the protein
D) the binding properties of the protein
The shape of the _______________ on the enzyme
determines to which ___________________ the enzyme
can bind.
A. active area; substrate
B. active site; product
C. loading dock; organelle
D. active site; substrate
The shape of the _______________ on the enzyme
determines to which ___________________ the enzyme
can bind.
A. active area; substrate
B. active site; product
C. loading dock; organelle
D. active site; substrate
There are many different enzymes located in a single
cell. Why do enzymes catalyze a specific reaction?
A. Most enzymes can catalyze many different
reactions.
B. The shape of the enzyme’s active site determines to
which substrate the particular enzyme can bind.
C. Enzymes are transported to specific substrates
(reactants) by ribosomes.
There are many different enzymes located in a single
cell. Why do enzymes catalyze a specific reaction?
A. Most enzymes can catalyze many different
reactions.
B. The shape of the enzyme’s active site determines to
which substrate the particular enzyme can bind.
C. Enzymes are transported to specific substrates
(reactants) by ribosomes.
List at LEAST THREE environmental factors that affect
the reaction rate of an enzyme:
1. _____________________
2. _____________________
3. _____________________
List at LEAST THREE environmental factors that affect
the reaction rate of an enzyme:
1. pH
2. TEMPERATURE
3. CONCENTRATION OF SUBSTRATE
4. CONCENTRATION OF ENZYME
5. SALT CONCENTRATION
When an enzyme has become misfolded or
unfolded and can no longer perform it’s
function, we say that the enzyme is
“_____________________.”
When an enzyme has become misfolded or
unfolded and can no longer perform it’s
function, we say that the enzyme is
“DENATURED.”
List TWO environmental factors that tend to denature
enzymes:
1. _____________________
2. _____________________
List TWO environmental factors that tend to denature
enzymes:
1. Changes in pH
2. INCREASE IN TEMPERATURE
3. Changes in SALT CONCENTRATION
Which of the following statements about
enzymes is false?
A) They increase the rate of chemical reactions.
B) They function as chemical catalysts.
C) They regulate virtually all chemical reactions
in a cell.
D) They are monomers used to build proteins.
Which of the following statements about
enzymes is false?
A) They increase the rate of chemical reactions.
B) They function as chemical catalysts.
C) They regulate virtually all chemical reactions
in a cell.
D) They are monomers used to build proteins.
When you add acid to a solution, _____.
A. the hydrogen ion concentration increases and
lowers the pH
B. the hydrogen ion concentration decreases and
raises the pH
C. the hydrogen ion concentration increases and
raises the pH
D. the hydrogen ion concentration decreases and
lowers the pH
When you add acid to a solution, _____.
A. the hydrogen ion concentration increases and
lowers the pH
B. the hydrogen ion concentration decreases and
raises the pH
C. the hydrogen ion concentration increases and
raises the pH
D. the hydrogen ion concentration decreases and
lowers the pH
Grapefruit juice is approximately pH 3, and tomato
juice is approximately pH 4. A glass of grapefruit
juice contains _____ H+ as a glass of tomato juice.
A. half as much
B. ten times as much
C. one-tenth as much
D. twice as much
Grapefruit juice is approximately pH 3, and tomato
juice is approximately pH 4. A glass of grapefruit
juice contains _____ H+ as a glass of tomato juice.
A. half as much
B. ten times as much
C. one-tenth as much
D. twice as much
A pH of 6 is how many times more acidic
than a pH of 9?
A. 3
B. 100
C. 300
D. 1,000
A pH of 6 is how many times more acidic
than a pH of 9?
A. 3
B. 100
C. 300
D. 1,000
An acid is _____.
A. a solution with a pH between 7 and 14
B. a material that resists pH changes
C. any compound that accepts hydrogen ions
D. a compound that donates hydrogen ions to a
solution
An acid is _____.
A. a solution with a pH between 7 and 14
B. a material that resists pH changes
C. any compound that accepts hydrogen ions
D. a compound that donates hydrogen ions to a
solution
Adding a base tends to _____ of a solution.
A. increase the hydrogen ion concentration and increase the
pH
B. lower hydrogen ion concentration and increase the pH
C. lower hydrogen ion concentration and lower the pH
D. increase hydrogen ion concentration and lower the pH
Adding a base tends to _____ of a solution.
A. increase the hydrogen ion concentration and increase the
pH
B. lower hydrogen ion concentration and increase the pH
C. lower hydrogen ion concentration and lower the pH
D. increase hydrogen ion concentration and lower the pH
Which of the following statements about pH is true?
A) The pH scale is a measure of oxygen ion concentration.
B) A single unit change on the pH scale is equivalent to a 1%
change in hydrogen ion concentration.
C) An increase in hydrogen ion concentration means a
decrease in pH scale units.
D) Basic pH levels are less than 7.
Which of the following statements about pH is true?
A) The pH scale is a measure of oxygen ion concentration.
B) A single unit change on the pH scale is equivalent to a 1%
change in hydrogen ion concentration.
C) An increase in hydrogen ion concentration means a
decrease in pH scale units.
D) Basic pH levels are less than 7.