Biol 212 Sinh học exam 2

 In eukaryotes, the citric acid cycle occurs in the_____

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  matrix of mitochondria

  
  

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  inner membrane of mitochondria.

  
  

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  intermembrane space of mitochondria.

  
  

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  cytosol of cells.

  
  

Which process of respiration in eukaryotic cells will proceed normally both in presence or absence of oxygen?

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  Electron transport

  
  

• Glycolysis

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  The citric acid cycle

  
  

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  Oxidative phosphorylation

  
  

The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is_____

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  NAD+

  
  

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  Water

  
  

• ADP

• Oxygen

Carbon dioxide (CO2) is released during which of the following stages of cellular respiration?

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  Oxidation of pyruvate to acetyl CoA and the citric acid cycle

  
  

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  The citric acid cycle and oxidative phosphorylation

  
  

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  Oxidative phosphorylation and fermentation

  
  

• Glycolysis and the oxidation of pyruvate to acetyl CoA

 In cellular respiration, oxygen serves as an electron acceptor.  What serves as an electron acceptor in fermentation?

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  Nitrogen

  
  

• Glucose

• CO₂

• Pyruvate

Proton pumps in the inner mitochondrial membrane help maintain an electrochemical gradient across the membrane. This gradient is used to help drive ATP synthesis via.....

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  Citric Acid Cycle

  
  

•  

  Oxidative phosphorylation

  
  

• Glycolysis

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  Substrate-level phosphorylation

  
  

Of the four processes in cellular respiration: glycolysis, pyruvate processing, citric acid cycle, electron transport and oxidative phosphorylation, which does not occur in mitochondria?

• Citric acid cycle

   

   

   

• Pyruvate processing

• Electron transport and oxidative phosphorylation

• Glycolysis

Over Spring Break, you gained 7 pounds! You resolve to exercise more to lose weight.  Your hours on the treadmill pay off, and you lose 5 pounds.  The mass that you lost during exercise included sugars, lipids, and proteins. Where did those molecules go?

• The atoms were converted from fat to protein, so they weren’t actually lost.

   

   

   

• When you exercise, you lose water through perspiration, but you don’t lose other types of mass

• The atoms were converted to energy, transferred to the treadmill to power the treadmill.

• Much of the mass that you lost was consumed in respiration, exhaled as carbon dioxide and water.

Which of the following is not a high energy intermediate?

 

 

 

 

• Pyruvate

• NADH

• FADH2

• ATP

Two scientists, Beadle and Tatum developed a “one gene, one enzyme” hypothesis from an experiment with the model organism, Neurospora crassa.  They were studying the pathway of metabolic events that lead to the production of arginine, an essential amino acid for growth of this organism.  The pathway is as follows:

They identified a single mutation that disabled enzyme 2.  What would be the characteristics of the Neurospora that bears that mutation

• It would accumulate Citrulline

   

   

   

• it would not grow on medium containing arginine

• It would grow on medium containing Citrulline, but not on Ornithine

• It would grow on medium containing the precursor