Question 1

Which of the following statements about the law of mass action is FALSE?

Accepted Answer

A)   The slope of a curve represents the rate of reaction; the greater the slope the faster the rate of reaction.
B)   Equilibrium is reached when the concentration of reactant equals the concentration of product.
C)   An increase in the concentration of reactants relative to products tends to push a reaction forward, and an increase in the concentration of products relative to reactants tends to push a reaction in reverse.
D)   It is critical in physiological processes because concentrations of reactants and products in cells and body fluids constantly change.
E)   After reaching equilibrium, more reactant is added, which causes the production of more product.F) B) and E)
G) A) and E)

Question 2

In terms of energy production, the Krebs cycle is significant because it

Accepted Answer

A)   reduces the coenzymes NAD and FAD for oxidative phosphorylation.
B)   produces acetylcoenzyme A for fatty acid synthesis.
C)   breaks down glucose.
D)   directly produces large amounts of ATP.
E)   provides acetylcoenzyme A for glucose synthesis.F) D) and E)
G) A) and D)

Question 3

Tony is about to participate in his first 10K run. One of his friends told him to make sure to "carbo load" and to take a niacin supplement before the race. Tony had heard the term "carbo loading" before but was not sure why it was necessary and had n why he would need a niacin supplement. He had been training for months and was confident that he would finish the race ea therefore, did not heed his friend's advice.
On the day of the race, Tony was so excited it felt like he was flying through the first half of the race. Tony wanted to beat his current best time and was nearing the end of the race when he decided to pick up his pace to the finish line. Unfortunately, Tony became fatigued and had to walk to the finish line out of breath and with his muscles burning.
-Refer to Scenario 3.1. Could Tony's excitement before the race have caused him to become fatigued toward the end of the race?

Accepted Answer

A)   No; the body has many ways to produce energy and, therefore, never runs out.
B)   Yes; his excitement created more demand for oxygen from his vital organs and tissues, therefore using up that oxygen to produce energy that he needed for the race.
C)   No; the excess heat produced in his body would have sped up his reaction rates, causing him to run faster.
D)   No; due to homeostatic mechanisms, metabolism remains constant at all times.
E)   Yes; because of his excitement, his breathing rate increased and he probably hyperventilated before the race, causing him to be tired.F) B) and E)
G) A) and B)

Question 4

Chemiosmotic coupling refers to

Accepted Answer

A)   coupling of the Krebs cycle to the electron transport chain.
B)   chemical coupling between substrate and enzymes.
C)   chemical coupling of each reaction within the mitochondria.
D)   the transfer of a phosphate group from one molecule to another.
E)   the harnessing of energy from the reactions of the electron transport chain to make ATP.F) A) and B)
G) D) and E)

Question 5

The sum of the thousands of chemical reactions that occur within the body is called

Accepted Answer

A)   oxidation.
B)   metabolism.
C)   hydrolysis.
D)   phosphorylation.
E)   reduction.F) A) and E)
G) C) and D)

Question 6

Before converting amino acids into intermediates for energy metabolism, they must first undergo

Accepted Answer

A)   denaturation.
B)   deamination.
C)   depeptidization.
D)   oxidation
E)   detoxification.F) B) and C)
G) B) and E)

Question 7

In a metabolic pathway, the enzyme working the slowest in that pathway is known as the_________ enzyme.

Accepted Answer

A)   binding
B)   inhibitor
C)   rate -limiting
D)   modulating
E)   allosteric regulatingF) C) and D)
G) B) and E)

Question 8

In a reduction reaction, which of the following is most likely added to the reactants? 
Reactions.

Accepted Answer

A)   water
B)   oxygen
C)   electrons
D)   neutrons
E)   phosphateF) B) and D)
G) B) and E)

Question 9

Identify the following chemical reaction by its type: Protein + H2O -Amino acids.

Accepted Answer

A)   hydrolysis
B)   oxidation
C)   condensation
D)   phosphorylation
E)   reductionF) B) and C)
G) A) and B)

Question 10

Enzymes act as________to increase reaction rate.

Accepted Answer

A)   an energy source
B)   catalysts
C)   intermediates
D)   reactants
E)   productsF) None of the above
G) A) and D)

Question 11

Molecules must have sufficient potential energy to overcome the _________and, thereby, allow the reaction to proceed.

Accepted Answer

A)   activation energy barrier
B)   mass action
C)   transitional energy barrier
D)   transformation state
E)   kinetic energyF) A) and C)
G) C) and D)

Question 12

Decreasing temperatures will___________ the frequency of collisions between molecules, thereby___________the reaction rate.

Accepted Answer

A)   not alter : increasing
B)   not alter : not changing
C)   increase : increasing
D)   decrease : decreasing
E)   increase : decreasingF) A) and B)
G) C) and D)

Question 13

Complete oxidation of 1 mole glucose produces 6 moles of water and 6 moles of carbon dioxide.

Accepted Answer

A) True 
 B)False

Question 14

Several types of chemical reactions are involved in the process of metabolism. Provide a general description of these reactions: hydrolysis, condensation, phosphorylation, dephosphorylation, oxidation, and reduction reactions.

Accepted Answer

Hydrolysis/condensation reactions involv...

Question 15

What process occurs within the inner mitochondrial membrane?

Accepted Answer

A)   glycolysis
B)   Krebs cycle
C)   gluconeogenesis
D)   glycogenesis
E)   electron transport chainF) B) and C)
G) All of the above

Question 16

Where within the cell does glycolysis occur?

Accepted Answer

A)   cytosol
B)   nucleus
C)   mitochondrial matrix
D)   inner mitochondrial membrane
E)   rough ERF) A) and B)
G) C) and D)

Question 17

Gluconeogenesis refers to synthesis of________and occurs in _______

Accepted Answer

A)   triglycerides : adipose tissue
B)   glucose : all organs
C)   glucose : the liver
D)   glycogen : the liver
E)   fatty acids : adipose tissueF) A) and B)
G) D) and E)

Question 18

When a substrate binds to a protein via weak interactions, the substrate is referred to as a

Accepted Answer

A)   peptide bond.
B)   ligand.
C)   product.
D)   modulator.
E)   reactant.F) A) and B)
G) C) and D)

Question 19

The enzyme carbonic anhydrase catalyzes the following reaction: CO2 + H2O -H2CO3, then H2CO3 dissociates reversibly to form H+ + HCO3  -
When tissue becomes more active, carbon dioxide increases due to its production in ,__________ Causing hydrogen ion concentration to_________ .

Accepted Answer

A)   the cytosol : decrease
B)   the cytosol : increase
C)   mitochondria : increase
D)   mitochondria : decrease
E)   both the cytosol and mitochondria : decreaseF) B) and C)
G) D) and E)

Question 20

What is the strength of binding between an enzyme and substrate called?

Accepted Answer

A)   enzyme -substrate complex
B)   covalent modulator
C)   peptide bond
D)   ligand
E)   affinityF) None of the above
G) B) and D)

Exam 3: Cell Metabolism

Gluconeogenesis refers to synthesis of__and occurs in _

Correct Answer
verified

The sum of the thousands of chemical reactions that occur within the body is called

Correct Answer
verified

In a metabolic pathway, the enzyme working the slowest in that pathway is known as the_________ enzyme.

Correct Answer
verified

What process occurs within the inner mitochondrial membrane?

Correct Answer
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Where within the cell does glycolysis occur?

Correct Answer
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Chemiosmotic coupling refers to

Correct Answer
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What is the strength of binding between an enzyme and substrate called?

Correct Answer
verified

Decreasing temperatures will_ the frequency of collisions between molecules, thereby_the reaction rate.

Correct Answer
verified

Several types of chemical reactions are involved in the process of metabolism. Provide a general description of these reactions: hydrolysis, condensation, phosphorylation, dephosphorylation, oxidation, and reduction reactions.

Correct Answer
verified
Hydrolysis/condensation reactions involv...
View Answer

In terms of energy production, the Krebs cycle is significant because it

Correct Answer
verified

In a reduction reaction, which of the following is most likely added to the reactants? Reactions.

Correct Answer
verified

The enzyme carbonic anhydrase catalyzes the following reaction: CO₂+ H₂O -H₂CO₃, then H₂CO₃dissociates reversibly to form H⁺+ HCO₃^- When tissue becomes more active, carbon dioxide increases due to its production in ,__ Causing hydrogen ion concentration to_ .

Correct Answer
verified

Molecules must have sufficient potential energy to overcome the _________and, thereby, allow the reaction to proceed.

Correct Answer
verified

Complete oxidation of 1 mole glucose produces 6 moles of water and 6 moles of carbon dioxide.

Correct Answer
verified

Enzymes act as________to increase reaction rate.

Correct Answer
verified

Correct Answer
verified

When a substrate binds to a protein via weak interactions, the substrate is referred to as a

Correct Answer
verified

Which of the following statements about the law of mass action is FALSE?

Correct Answer
verified

Identify the following chemical reaction by its type: Protein + H₂O -Amino acids.

Correct Answer
verified

Before converting amino acids into intermediates for energy metabolism, they must first undergo

Correct Answer
verified

Exam 3: Cell Metabolism

Gluconeogenesis refers to synthesis of________and occurs in _______

Correct AnswerverifiedShow Answer

The sum of the thousands of chemical reactions that occur within the body is called

Correct AnswerverifiedShow Answer

In a metabolic pathway, the enzyme working the slowest in that pathway is known as the_________ enzyme.

Correct AnswerverifiedShow Answer

What process occurs within the inner mitochondrial membrane?

Correct AnswerverifiedShow Answer

Where within the cell does glycolysis occur?

Correct AnswerverifiedShow Answer

Chemiosmotic coupling refers to

Correct AnswerverifiedShow Answer

What is the strength of binding between an enzyme and substrate called?

Correct AnswerverifiedShow Answer

Decreasing temperatures will___________ the frequency of collisions between molecules, thereby___________the reaction rate.

Correct AnswerverifiedShow Answer

Several types of chemical reactions are involved in the process of metabolism. Provide a general description of these reactions: hydrolysis, condensation, phosphorylation, dephosphorylation, oxidation, and reduction reactions.

Correct AnswerverifiedHydrolysis/condensation reactions involv...View AnswerShow Answer

In terms of energy production, the Krebs cycle is significant because it

Correct AnswerverifiedShow Answer

In a reduction reaction, which of the following is most likely added to the reactants? Reactions.

Correct AnswerverifiedShow Answer

The enzyme carbonic anhydrase catalyzes the following reaction: CO2 + H2O -H2CO3, then H2CO3 dissociates reversibly to form H+ + HCO3 - When tissue becomes more active, carbon dioxide increases due to its production in ,__________ Causing hydrogen ion concentration to_________ .

Correct AnswerverifiedShow Answer

Molecules must have sufficient potential energy to overcome the _________and, thereby, allow the reaction to proceed.

Correct AnswerverifiedShow Answer

Complete oxidation of 1 mole glucose produces 6 moles of water and 6 moles of carbon dioxide.

Correct AnswerverifiedShow Answer

Enzymes act as________to increase reaction rate.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When a substrate binds to a protein via weak interactions, the substrate is referred to as a

Correct AnswerverifiedShow Answer

Which of the following statements about the law of mass action is FALSE?

Correct AnswerverifiedShow Answer

Identify the following chemical reaction by its type: Protein + H2O -Amino acids.

Correct AnswerverifiedShow Answer

Before converting amino acids into intermediates for energy metabolism, they must first undergo

Correct AnswerverifiedShow Answer

Gluconeogenesis refers to synthesis of__and occurs in _

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Decreasing temperatures will_ the frequency of collisions between molecules, thereby_the reaction rate.

Correct Answer
verified

Correct Answer
verified
Hydrolysis/condensation reactions involv...
View Answer

Correct Answer
verified

Correct Answer
verified

The enzyme carbonic anhydrase catalyzes the following reaction: CO₂+ H₂O -H₂CO₃, then H₂CO₃dissociates reversibly to form H⁺+ HCO₃^- When tissue becomes more active, carbon dioxide increases due to its production in ,__ Causing hydrogen ion concentration to_ .

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Identify the following chemical reaction by its type: Protein + H₂O -Amino acids.

Correct Answer
verified

Correct Answer
verified