Question 1

Some prokaryotic organisms use nitrogen fixation to obtain organic nitrogen.Which of the following statements about nitrogen fixation is false?

Accepted Answer

A)  Nitrogen fixation requires the breaking a N ≡\equiv≡ N triple bond.
B)  Nitrogen fixation evolved after anaerobic photosynthesis,but before aerobic respiration.
C)  Nitrogen fixation can only occur in the presence of oxygen.
D)  Nitrogen fixation evolved as a way to obtain organic nitrogen for production of proteins and nucleic acids. E) B) and C)
F) A) and B)

Question 2

Which of the following statements accurately reflects what happens to a glucose molecule during the initial five phases of glycolysis?

Accepted Answer

A)  Glucose,a six-carbon sugar,enters the cell by passive transport and is primed and converted into glucose three-phosphate,which requires two ATP molecules.The remaining four steps involve splitting the six-carbon molecule into two three-carbon molecules.
B)  Glucose,a six-carbon sugar,enters the cell by active transport and is primed and converted into glucose three-phosphate,which requires two ATP molecules.The remaining four steps involve splitting the six-carbon molecule into two three-carbon molecules.
C)  Glucose,a six-carbon sugar,enters the cell by simple diffusion and is primed and converted into glucose three-phosphate,which requires two ATP molecules.The remaining four steps involve splitting the six-carbon molecule into two three-carbon molecules.
D)  Glucose,a six-carbon sugar,enters the cell by G protein mediation and is primed and converted into glucose three-phosphate,which requires two ATP molecules.The remaining four steps involve splitting the six-carbon molecule into two three-carbon molecules.E) B) and C)
F) B) and D)

Question 3

A single glucose molecule can drive the Krebs cycle

Accepted Answer

A)  one turn.
B)  two turns.
C)  three turns.
D)  four turns.
E)  six turns.F) A) and D)
G) A) and C)

Question 4

Chemiosmotic generation of ATP is driven by

Accepted Answer

A)  Pi transfer through the plasma membrane.
B)  the Na+/K+ pump.
C)  a difference in H+ concentration on the two sides of the mitochondrial membrane.
D)  osmosis of macromolecules.
E)  large quantities of ADP.F) B) and C)
G) A) and B)

Question 5

Your friend is having difficulty keeping track of the energy flow from glucose through glycolysis,the Krebs cycle and electron transport.Your best advice would be to

Accepted Answer

A)  follow ATP production.
B)  follow the protons.
C)  follow NAD+ production.
D)  follow the electrons.E) A) and C)
F) None of the above

Question 6

All of the reactions of glucose oxidation that follow glycolysis,and involve the transfer of electrons to their final acceptor,take place in eukaryotic cells in the ___________.

Accepted Answer

A)  chloroplasts
B)  nucleus
C)  mitochondria
D)  plasma membraneE) A) and B)
F) None of the above

Question 7

Select the correct sequence concerning glucose catabolism.

Accepted Answer

A)  glycolysis →\rarr→  Pyruvate  →\rarr→  Acetyl CoA  →\rarr→  Electron Transport Chain  →\rarr→  Krebs Cycle
B)  glycolysis  →\rarr→  Pyruvate  →\rarr→  Acetyl CoA  →\rarr→  Krebs Cycle →\rarr→  Electron Transport Chain
C)  glycolysis  →\rarr→  Acetyl CoA  →\rarr→  Pyruvate →\rarr→  Electron Transport Chain  →\rarr→  Krebs Cycle
D)  glycolysis  →\rarr→  Acetyl CoA  →\rarr→  Pyruvate  →\rarr→  Krebs Cycle  →\rarr→  Electron Transport Chain E) All of the above
F) C) and D)

Question 8

A gram of fatty acid can yield how many more times the energy as one gram of glucose?

Accepted Answer

A)  6
B)  5
C)  4
D)  3
E)  2F) B) and D)
G) A) and D)

Question 9

Why are the components of the electron transport chain embedded in the inner mitochondrial membrane rather than floating freely in the cytoplasm of mitochondrial matrix?

Accepted Answer

A)  to generate and maintain the protein gradient essential for ATP production
B)  to separate the ATP from the ADP
C)  because electrons cannot float in the matrix
D)  in order to stabilize the proteinsE) C) and D)
F) All of the above

Question 10

The first stage of cellular respiration,_____________,occurs with or without oxygen present.

Accepted Answer

A)  the Kreb's cycle
B)  glycolysis
C)  gluconeogenesis
D)  cleavageE) A) and D)
F) B) and D)

Question 11

During aerobic respiration the final acceptor of the hydrogen atoms is

Accepted Answer

A)  oxygen.
B)  carbon dioxide.
C)  water.
D)  glucose.
E)  pyruvatE.F) C) and E)
G) All of the above

Question 12

The electron transport chain consists of all of the following except

Accepted Answer

A)  NADH dehydrogenase.
B)  cytochrome complex.
C)  oxygenase.
D)  cytochrome c oxidase.
E)  ubiquinone Q.F) A) and D)
G) C) and D)

Question 13

In the cyclic reaction sequence called the Krebs cycle,the following chemical events take place except

Accepted Answer

A)  the acetyl group is joined with a four carbon molecule,oxaloacetate.
B)  the resulting six carbon molecule is oxidized.
C)  electrons generated are used to produce NADH.
D)  two carbons per cycle are made into CO2 molecules.
E)  pyruvate molecules are restored to the cyclE.F) D) and E)
G) B) and C)

Question 14

If you were an anaerobic bacterium and needed to harvest energy,which of the following would be your best option?

Accepted Answer

A)  glycolysis and fermentation
B)  fermentation and cellular respiration
C)  Krebs cycle and fermentation
D)  fermentation onlyE) All of the above
F) None of the above

Question 15

Yeast cells under anaerobic conditions

Accepted Answer

A)  die.
B)  produce ethyl alcohol (ethanol) .
C)  produce oxygen.
D)  switch to oxidative respiration.
E)  push the glycolytic pathway backward.F) C) and D)
G) A) and D)

Question 16

In oxidative respiration,energy is harvested from glucose molecules in a sequence of four major pathways.Which of the following is not one of these four pathways?

Accepted Answer

A)  Krebs cycle
B)  glycolysis
C)  electron transfer through the transport chain
D)  beta oxidation
E)  pyruvate oxidationF) A) and B)
G) B) and D)

Exam 7: How Cells Harvest Energy

A single glucose molecule can drive the Krebs cycle

Correct Answer
verified

Your friend is having difficulty keeping track of the energy flow from glucose through glycolysis,the Krebs cycle and electron transport.Your best advice would be to

Correct Answer
verified

If you were an anaerobic bacterium and needed to harvest energy,which of the following would be your best option?

Correct Answer
verified

Chemiosmotic generation of ATP is driven by

Correct Answer
verified

Some prokaryotic organisms use nitrogen fixation to obtain organic nitrogen.Which of the following statements about nitrogen fixation is false?

Correct Answer
verified

In oxidative respiration,energy is harvested from glucose molecules in a sequence of four major pathways.Which of the following is not one of these four pathways?

Correct Answer
verified

Which of the following statements accurately reflects what happens to a glucose molecule during the initial five phases of glycolysis?

Correct Answer
verified

The first stage of cellular respiration,_____________,occurs with or without oxygen present.

Correct Answer
verified

All of the reactions of glucose oxidation that follow glycolysis,and involve the transfer of electrons to their final acceptor,take place in eukaryotic cells in the ___________.

Correct Answer
verified

In the cyclic reaction sequence called the Krebs cycle,the following chemical events take place except

Correct Answer
verified

During aerobic respiration the final acceptor of the hydrogen atoms is

Correct Answer
verified

The electron transport chain consists of all of the following except

Correct Answer
verified

Why are the components of the electron transport chain embedded in the inner mitochondrial membrane rather than floating freely in the cytoplasm of mitochondrial matrix?

Correct Answer
verified

A gram of fatty acid can yield how many more times the energy as one gram of glucose?

Correct Answer
verified

Yeast cells under anaerobic conditions

Correct Answer
verified

Select the correct sequence concerning glucose catabolism.

Correct Answer
verified

Exam 7: How Cells Harvest Energy

A single glucose molecule can drive the Krebs cycle

Correct AnswerverifiedShow Answer

Your friend is having difficulty keeping track of the energy flow from glucose through glycolysis,the Krebs cycle and electron transport.Your best advice would be to

Correct AnswerverifiedShow Answer

If you were an anaerobic bacterium and needed to harvest energy,which of the following would be your best option?

Correct AnswerverifiedShow Answer

Chemiosmotic generation of ATP is driven by

Correct AnswerverifiedShow Answer

Some prokaryotic organisms use nitrogen fixation to obtain organic nitrogen.Which of the following statements about nitrogen fixation is false?

Correct AnswerverifiedShow Answer

In oxidative respiration,energy is harvested from glucose molecules in a sequence of four major pathways.Which of the following is not one of these four pathways?

Correct AnswerverifiedShow Answer

Which of the following statements accurately reflects what happens to a glucose molecule during the initial five phases of glycolysis?

Correct AnswerverifiedShow Answer

The first stage of cellular respiration,_____________,occurs with or without oxygen present.

Correct AnswerverifiedShow Answer

All of the reactions of glucose oxidation that follow glycolysis,and involve the transfer of electrons to their final acceptor,take place in eukaryotic cells in the ___________.

Correct AnswerverifiedShow Answer

In the cyclic reaction sequence called the Krebs cycle,the following chemical events take place except

Correct AnswerverifiedShow Answer

During aerobic respiration the final acceptor of the hydrogen atoms is

Correct AnswerverifiedShow Answer

The electron transport chain consists of all of the following except

Correct AnswerverifiedShow Answer

Why are the components of the electron transport chain embedded in the inner mitochondrial membrane rather than floating freely in the cytoplasm of mitochondrial matrix?

Correct AnswerverifiedShow Answer

A gram of fatty acid can yield how many more times the energy as one gram of glucose?

Correct AnswerverifiedShow Answer

Yeast cells under anaerobic conditions

Correct AnswerverifiedShow Answer

Select the correct sequence concerning glucose catabolism.

Correct AnswerverifiedShow Answer

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