Question 1

The enzymes of the citric acid cycle are located in the

Accepted Answer

A)  outer mitochondrial membrane.
B)  matrix and inner mitochondrial membrane.
C)  nucleus.
D)  cytoplasm.E) B) and C)
F) None of the above

Question 2

When did the level of oxygen in Earth's atmosphere become high enough to sustain aerobic respiration?

Accepted Answer

A)  1.0 billion years ago
B)  3.5 billion years ago
C)  1.5 billion years ago
D)  2.7 billion years agoE) B) and C)
F) C) and D) D

Question 3

A culture of bacteria growing aerobically is fed glucose containing radioactive carbon and is then examined.During the citric acid cycle,radioactivity would first appear in

Accepted Answer

A)  oxaloacetic acid.
B)  CoA.
C)  citrate.
D)  NADH.E) A) and C)
F) C) and D)

Question 4

Which of the following statements regarding photosynthesis and cellular respiration is true?

Accepted Answer

A)  Cellular respiration occurs in mitochondria and in chloroplasts.
B)  Photosynthesis occurs in mitochondria,and cellular respiration occurs in chloroplasts.
C)  Photosynthesis occurs in mitochondria and in chloroplasts.
D)  Photosynthesis occurs in chloroplasts,and cellular respiration occurs in mitochondria.E) C) and D)
F) All of the above

Question 5

A kilocalorie is defined as

Accepted Answer

A)  the quantity of heat needed to raise the temperature of 1 kg of water by 1°C.
B)  the quantity of food used to maintain normal bodily functions.
C)  the quantity of food consumed during a given type of exercise.
D)  the quantity of glucose needed to increase the body temperature by 1°C.E) All of the above
F) B) and C)

Question 6

Which step of the citric acid cycle requires both NAD+ and ADP as reactants?

Accepted Answer

A)  step 1
B)  step 2
C)  step 3
D)  step 4E) None of the above
F) A) and B) C

Question 7

Humans use about of their daily calories to maintain brain cells and power other life- sustaining activities.

Accepted Answer

A)  75%
B)  50%
C)  25%
D)  90%E) C) and D)
F) None of the above

Question 8

In fermentation,is .

Accepted Answer

A)  NAD+ ...oxidized
B)  NADH ...oxidized
C)  NADH ...reduced
D)  ethanol ...oxidizedE) C) and D)
F) B) and C)

Question 9

Which of the following are products of cellular respiration?

Accepted Answer

A)  energy to make ATP and carbon dioxide
B)  oxygen and carbon dioxide
C)  oxygen and glucose
D)  oxygen and energy to make ATPE) A) and B)
F) None of the above

Question 10

Which of the following statements about the energy yields from cellular respiration is true?

Accepted Answer

A)  Cellular respiration is more efficient at harnessing energy from glucose than car engines are at harnessing energy from gasoline.
B)  The heat produced during cellular respiration is only a tiny fraction of the chemical energy available in a glucose molecule.
C)  Cellular respiration converts the kinetic energy of glucose into chemical energy.
D)  Cellular respiration converts all of the energy in glucose into high- energy ATP bonds.E) B) and D)
F) A) and C)

Question 11

A drug is tested in the laboratory and is found to create holes in both mitochondrial membranes.Scientists suspect that the drug will be harmful to human cells because it will inhibit

Accepted Answer

A)  glycolysis.
B)  oxidative phosphorylation.
C)  the citric acid cycle.
D)  the citric acid cycle and oxidative phosphorylation.E) A) and D)
F) A) and C) D

Question 12

How do cells capture the energy released by cellular respiration?

Accepted Answer

A)  They store it in molecules of carbon dioxide.
B)  They produce glucose.
C)  The energy is coupled to oxygen.
D)  They produce ATP.E) A) and B)
F) All of the above

Question 13

In biological systems,an important enzyme involved in the regulation of redox reactions is

Accepted Answer

A)  oxygen.
B)  ATP.
C)  glucose.
D)  dehydrogenase.E) All of the above
F) A) and B)

Question 14

Which of the following statements regarding food is false?

Accepted Answer

A)  Food provides the raw materials for biosynthetic pathways that consume ATP.
B)  Food provides the raw materials for biosynthetic pathways that can produce molecules that are not actually present in the original food.
C)  Food provides the raw materials for biosynthetic pathways that make molecules for cellular repair and growth.
D)  Food provides the raw materials for biosynthetic pathways that can produce sugar by a process that is the exact opposite of glycolysis.E) None of the above
F) B) and D)

Question 15

Respiration _ _,and cellular respiration _.

Accepted Answer

A)  uses glucose ...produces glucose
B)  produces glucose ...produces oxygen
C)  produces ATP ...is gas exchange
D)  is gas exchange ...produces ATPE) A) and B)
F) C) and D)

Question 16

During chemiosmosis,

Accepted Answer

A)  energy is released as H+ ions move freely across mitochondrial membranes.
B)  a concentration gradient is generated when large numbers of H+ ions are passively transported from the matrix of the mitochondrion to the mitochondrion's intermembrane space.
C)  H+ ions serve as the final electron acceptor.
D)  ATP is synthesized when H+ ions move through a channel in ATP synthase.E) All of the above
F) A) and B)

Question 17

Which of the following statements regarding cellular respiration is false?

Accepted Answer

A)  Cellular respiration releases heat.
B)  Cellular respiration produces carbon dioxide.
C)  Cellular respiration produces water.
D)  Cellular respiration is a single chemical reaction with just one step.E) A) and C)
F) A) and B)

Question 18

Which of the following options lists the stages in cellular respiration in the correct order?

Accepted Answer

A)  glycolysis,the citric acid cycle,and oxidative phosphorylation
B)  the citric acid cycle,oxidative phosphorylation,and glycolysis
C)  glycolysis,oxidative phosphorylation,and the citric acid cycle
D)  oxidative phosphorylation,glycolysis,and the citric acid cycleE) B) and D)
F) A) and B)

Question 19

A mutant protist is found in which some mitochondria lack an inner mitochondrial membrane.Which of the following pathways would be completely disrupted in these mitochondria?

Accepted Answer

A)  biosynthesis
B)  glycolysis
C)  oxidative phosphorylation
D)  alcoholic fermentationE) All of the above
F) B) and C)

Question 20

Bacteria that are unable to survive in the presence of oxygen are called

Accepted Answer

A)  facultative anaerobes.
B)  obligate anaerobes.
C)  aerotolerant anaerobes.
D)  obligate aerobes.E) A) and B)
F) A) and C)

Exam 6: How Cells Harvest Chemical Energy

The enzymes of the citric acid cycle are located in the

Correct AnswerverifiedShow Answer

When did the level of oxygen in Earth's atmosphere become high enough to sustain aerobic respiration?

Correct AnswerverifiedD

A culture of bacteria growing aerobically is fed glucose containing radioactive carbon and is then examined.During the citric acid cycle,radioactivity would first appear in

Correct AnswerverifiedShow Answer

Which of the following statements regarding photosynthesis and cellular respiration is true?

Correct AnswerverifiedShow Answer

A kilocalorie is defined as

Correct AnswerverifiedShow Answer

Which step of the citric acid cycle requires both NAD+ and ADP as reactants?

Correct AnswerverifiedC

Humans use about of their daily calories to maintain brain cells and power other life- sustaining activities.

Correct AnswerverifiedShow Answer

In fermentation,is .

Correct AnswerverifiedShow Answer

Which of the following are products of cellular respiration?

Correct AnswerverifiedShow Answer

Which of the following statements about the energy yields from cellular respiration is true?

Correct AnswerverifiedShow Answer

A drug is tested in the laboratory and is found to create holes in both mitochondrial membranes.Scientists suspect that the drug will be harmful to human cells because it will inhibit

Correct AnswerverifiedD

How do cells capture the energy released by cellular respiration?

Correct AnswerverifiedShow Answer

In biological systems,an important enzyme involved in the regulation of redox reactions is

Correct AnswerverifiedShow Answer

Which of the following statements regarding food is false?

Correct AnswerverifiedShow Answer

Respiration _ _,and cellular respiration _.

Correct AnswerverifiedShow Answer

During chemiosmosis,

Correct AnswerverifiedShow Answer

Which of the following statements regarding cellular respiration is false?

Correct AnswerverifiedShow Answer

Which of the following options lists the stages in cellular respiration in the correct order?

Correct AnswerverifiedShow Answer

A mutant protist is found in which some mitochondria lack an inner mitochondrial membrane.Which of the following pathways would be completely disrupted in these mitochondria?

Correct AnswerverifiedShow Answer

Bacteria that are unable to survive in the presence of oxygen are called

Correct AnswerverifiedShow Answer

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