Question 1

What establishes an electrochemical gradient across a membrane to provide energy for ATP production?

Accepted Answer

A)  The mitochondrion's electron transport system provides the ions
B)  Hydrogen ions naturally collect on the outside of the organelle membrane
C)  Hydrogen ions are pumped across the membrane by carrier proteins
D)  All of the choices establish the electrochemical gradientE) None of the above
F) A) and D)

Question 2

The enzyme-substrate complex is

Accepted Answer

A)  not strong and will freely dissociate after it stresses certain chemical bonds in a substrate.
B)  secured by covalent bonds to one or more points in the active site of the enzyme.
C)  able to display unique spectroscopic characteristics not seen by either the enzyme or the substrate alone.
D)  proved by the saturation effect in which the reaction rate reaches a maximum even through more substrate is added.
E)  all of the choices are correct.F) A) and C)
G) A) and B)

Question 3

Some desert mammals and beetles can live their life without ever drinking liquid water;they survive on "metabolic water." Which is the most likely source of "metabolic water?"

Accepted Answer

A)  Is absorbed from the air along with respiratory oxygen.
B)  Results from oxidative phosphorylation inside the mitochondria.
C)  Is a breakdown product from glycolysis in the cytoplasm.
D)  Is water that was never allowed to pass out the cell.E) A) and B)
F) All of the above

Question 4

Which pairs of processes are anaerobic?

Accepted Answer

A)  Glycolysis and the electron transport system
B)  Fermentation and the Krebs cycle
C)  Glycolysis and the Krebs cycle
D)  Fermentation and glycolysisE) B) and D)
F) B) and C)

Question 5

Following glycolysis,the two molecules of pyruvic acid enter a mitochondrion where each molecule is oxidized to produce

Accepted Answer

A)  glucose.
B)  acetyl CoA and carbon dioxide.
C)  acetyl CoA and water.
D)  pyruvates and carbon dioxide.E) A) and D)
F) B) and C)

Question 6

Glycolysis produces a net yield of ____ ATP molecules.

Accepted Answer

A)  2
B)  4
C)  8
D)  10E) None of the above
F) B) and C)

Question 7

How specific are enzymes?

Accepted Answer

A)  Many enzymes can "cross over" to catalyze reactions of different substrates in the same chemical family
B)  There are 20 amino acids and therefore 20 enzymes that control all protein metabolic reactions
C)  An enzyme catalyzes one reaction but it may produce one product one time,another product another time
D)  An enzyme catalyzes one reaction and it produces a distinct productE) B) and C)
F) A) and C)

Question 8

In the absence of oxygen,glycolysis results in glucose being degraded into two 3-carbon molecules of ______ _______.

Accepted Answer

The answer of In the absence of oxygen,glycolysis results in...

Question 9

When exergonic and endergonic reactions are coupled,which reaction involves more energy and why are the reaction energies not exactly the same?

Accepted Answer

When exergonic and endergonic reactions ...

Question 10

According to the laws of physics governing energy

Accepted Answer

A)  when a liter of gasoline is burned in a car engine,100% of its energy moves the car along the road.
B)  when you eat a kilogram of food,you will assemble exactly a kilogram of additional body weight on your body.
C)  sunlight that is absorbed on the earth eventually returns to space as dispersed heat.
D)  a calorie of sunlight becomes a calorie of plant tissue that,when eaten by an animal,becomes a calorie of heat lost in muscle "power."E) B) and C)
F) None of the above

Question 11

Aerobic metabolism requires oxygen consumption and the ultimate source of this free oxygen is generated by autotrophic organisms by the process of _______.

Accepted Answer

The answer of Aerobic metabolism requires oxygen consumption and the...

Question 12

The second law of thermodynamics states that

Accepted Answer

A)  energy is not created nor destroyed,but it can change into matter.
B)  energy is not created nor destroyed,but it can change from one energy form to another.
C)  energy organizes in a closed system and moves toward increasing order.
D)  energy dissipates in a closed system and moves toward increasing disorder.E) A) and B)
F) A) and C)

Question 13

Which process involves chemiosmotic coupling?

Accepted Answer

A)  The Krebs cycle
B)  Glycolysis
C)  The electron transport system
D)  FermentationE) A) and B)
F) A) and C)

Question 14

Living organisms contain stored energy in the form of chemical compounds.When organisms die,what happens to this stored energy?

Accepted Answer

A)  All molecules immediately degrade into basic elements
B)  All chemicals immediately lose their high-energy bonds
C)  Cells lose their organization over time and macromolecules break down because there is no longer an input of energy to maintain an organized state
D)  Chemical compounds remain intact and ready to start up again unless digested by a consumer or decomposerE) None of the above
F) A) and D)

Question 15

Discuss the recent research that claims that food intake,and therefore the amount of fat deposition,is creating a "set point" in specific parts of the brain.

Accepted Answer

Recent research has suggested that food ...

Question 16

How do an enzyme and its substrate fit together?

Accepted Answer

A)  The enzyme breaks down as product is released
B)  The whole enzyme is a key that fits into the substrate that is a lock forming a new molecule product
C)  Any active site is permanently changed when it interacts with the substrate
D)  As the substrate binds to the enzyme,the shape of the active site changes to accommodate the reactionE) None of the above
F) B) and C)

Question 17

Which is true of enzyme-catalyzed reactions?

Accepted Answer

A)  All enzymes promote only catabolic reactions
B)  Reactions catalyzed by most enzymes tend to go predominantly in one direction
C)  All enzymatic reactions are reversible and produce equal amounts of products in both directions
D)  All enzymes promote only anabolic reactionsE) None of the above
F) C) and D)

Question 18

Which form of energy is NOT correctly associated with an example?

Accepted Answer

A)  Kinetic energy: glucose
B)  Kinetic energy: muscle movement
C)  Potential energy: water held behind a dam
D)  Kinetic energy: a ball rolling down a hillE) B) and C)
F) A) and C)

Question 19

Which process occurs in the cytoplasm outside the mitochondria?

Accepted Answer

A)  Krebs cycle
B)  Glycolysis
C)  Electron transport system
D)  Substrate level phosphorylationE) C) and D)
F) A) and B)

Question 20

Which process produces alcohol or lactate?

Accepted Answer

A)  The Krebs cycle
B)  Glycolysis
C)  The electron transport system
D)  Fermentation
E)  Oxidative phosphorylationF) A) and B)
G) A) and C)

Exam 4: Cellular Metabolism

According to the laws of physics governing energy

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When exergonic and endergonic reactions are coupled,which reaction involves more energy and why are the reaction energies not exactly the same?

Correct AnswerAnswered by ExamLex AIWhen exergonic and endergonic reactions ...View AnswerShow Answer

Discuss the recent research that claims that food intake,and therefore the amount of fat deposition,is creating a "set point" in specific parts of the brain.

Correct AnswerAnswered by ExamLex AIRecent research has suggested that food ...View AnswerShow Answer

Aerobic metabolism requires oxygen consumption and the ultimate source of this free oxygen is generated by autotrophic organisms by the process of _______.

Correct AnswerverifiedShow Answer

How do an enzyme and its substrate fit together?

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Which process occurs in the cytoplasm outside the mitochondria?

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In the absence of oxygen,glycolysis results in glucose being degraded into two 3-carbon molecules of ______ _______.

Correct AnswerverifiedShow Answer

Which process involves chemiosmotic coupling?

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What establishes an electrochemical gradient across a membrane to provide energy for ATP production?

Correct AnswerverifiedShow Answer

Following glycolysis,the two molecules of pyruvic acid enter a mitochondrion where each molecule is oxidized to produce

Correct AnswerverifiedShow Answer

Some desert mammals and beetles can live their life without ever drinking liquid water;they survive on "metabolic water." Which is the most likely source of "metabolic water?"

Correct AnswerverifiedShow Answer

Glycolysis produces a net yield of ____ ATP molecules.

Correct AnswerverifiedShow Answer

Which pairs of processes are anaerobic?

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How specific are enzymes?

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Which form of energy is NOT correctly associated with an example?

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Which process produces alcohol or lactate?

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The second law of thermodynamics states that

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The enzyme-substrate complex is

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Living organisms contain stored energy in the form of chemical compounds.When organisms die,what happens to this stored energy?

Correct AnswerverifiedShow Answer

Which is true of enzyme-catalyzed reactions?

Correct AnswerverifiedShow Answer

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When exergonic and endergonic reactions ...
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Recent research has suggested that food ...
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In the absence of oxygen,glycolysis results in glucose being degraded into two 3-carbon molecules of _.

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