November 9, 2009 AP Biology
Unit: Cellular Energetics (Chapters 9 and 10) Chapter 9: Cellular Respiration Practice Test
1. Organisms that can manufacture their own chemical energy sources are called _____________. ________________________________________
2. ________ depend on energy stored in chemical bonds by autotrophs for their food energy. ________________________________________
3. Simple molecules are further broken down in cells in a process called _________, during which energy stored in their chemical bonds is used to power the production of ATP. ________________________________________
4. In glycolysis, a major portion of the energy remains in the final product, which is called ________. ________________________________________
5. For further derivation of energy, aerobic cells must convert pyruvate into acetyl-CoA by stripping off a C02 molecule. This process is known as ___________. ________________________________________
6. Because the chemical formation of ATP is driven by a diffusion force similar to osmosis, this process is referred to as ___________. ________________________________________
7. The amino acids must be first __________ before they can be used in catabolic reactions. ________________________________________
8. Fats undergo a process called ________ oxidation, in which the products are acetyl coenzyme molecules. ________________________________________
9. The first stage of cellular respiration,_____________, occurs with or without oxygen present. ________________________________________
10. An electron carrier that is used in harvesting energy from glucose molecules in a series of gradual steps in the cytoplasm is A. pyruvate.
B. cyclic AMP.
11. In eukaryotes, the glycolytic reactions take place in the A. mitochondria of the cell.
B. cytoplasm of the cell.
C. ribosomes of the cell.
D. endoplasmic reticulum of each cell.
E. Golgi bodies of the cell.
12. The first stage of cellular respiration, and the oldest in terms of evolution is A. decarboxylation.
13. In the absence of oxygen, hydrogen atoms generated by glycolysis are donated to organic molecules in a process called A. fermentation.
D. electron transport chain reactions.
E. acetyl-CoA formation.
14. Which of the following statements about fermentation is false? A. Fermentation takes place only in the absence of oxygen.
B. The recipient of hydrogen atoms is an organic molecule.
C. Water is not one of the by-products.
D. The Krebs cycle and electron transfer system do not occur. E. Cells can only undergo one type of fermentation.
15. Chemiosmotic generation of ATP is driven by
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.
16. The reaction, C6H6O6 + 6O2 = 6 CO2 + 6 H2O, when it occurs in living cells is known as A. aerobic fermentation.
B. anaerobic fermentation.
C. aerobic respiration.
E. oxidative phosphorylation.
17. Out of the total amount of free energy potentially available from total oxidation of glucose, the number of ATP made by cells is equal to an energy efficiency of about A. 2%.
18. 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? A. Krebs cycle
C. electron transfer through the transport chain
D. beta oxidation
E. pyruvate oxidation
19. In which of the following steps of glycolysis are two ATP molecules are required? A. cleavage and rearrangement
B. glucose priming
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