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ThinkQuest
Webcytology was created for ThinkQuest 1999.
Quizzes

The Krebs cycle and electron transport chain

[go to this section in the Guide]
Chapter Four: Cell Nutrition and Respiration


Question 1
 Before entering the Krebs cycle, molecules of pyruvic acid undergo a reaction called
   1.  the Calvin cycle
2.  the electron transport chain
3.  fermentation
4.  the oxidation of pyruvic acid
 

Question 2
 Which compound bonds to acetyl coenzyme A to start the Krebs cycle but is later regenerated?
   1.  ribulose diphosphate
2.  oxaloacetic acid
3.  pyruvic acid
4.  lactic acid
 

Question 3
 How many molecules of ATP are produced directly as a result of a single turn of the Krebs cycle?
   1.  1
2.  2
3.  3
4.  4
 

Question 4
 One turn of the Krebs cycle produces how many molecules of NADH?
   1.  1
2.  2
3.  3
4.  4
 

Question 5
 The reactants in the electron transport chain are
   1.  NADH and FADH2
2.  pyruvic acid and lactic acid
3.  water and oxygen
4.  carbon dioxide and ribulose diphosphate
 

Question 6
 What molecule finally accepts the electrons passed down through the electron transport chain?
   1.  water
2.  oxygen
3.  NADH
4.  carbon dioxide
 

Question 7
 The energy released from the electron transport chain is used to
   1.  directly form ATP
2.  break down glucose
3.  power chemiosmosis
4.  digest food particles
 

Question 8
 How many molecules of ATP are eventually produced for each molecule of FAD2 which enters the electron transport chain?
   1.  1
2.  2
3.  3
4.  4
 


 
 

ThinkQuest Team #27819 - 27819@for.net
Team: Andrew Kallem, Josh Tauberer
Coaches: Ms. Acerra, Mr. Kwitkin