ZOO1114 – Practice Midterm 2– Spring2010 Form A Multiple Choice: Choose the BEST answer. Metabolism (12 questions) 1. A process that produces water and carbon dioxide is a) respiration b) fermentation c) photosynthesis d) Calvin cycle 2. During respiration, ATP is formed as a) hydrogen ions (protons) move through ATP-ase proteins embedded in the inner membrane. b) electrons are accumulated in the inner membrane. c) hydrogen ions (protons) are accumulated in the outer membrane. d) phosphate molecules are attached to NAD molecules. 3. Which of the following descriptions of glycolysis is correct? a) During glycolysis (which takes place in the mitochondrion), six-carbon glucose molecules are broken down to simpler compounds but no ATP is formed. b) During glycolysis (which takes place in the cytoplasm), three-carbon sugar molecules are assembled into more complex compounds but no ATP is required. c) During glycolysis (which takes place in the mitochondrion), six-carbon glucose molecules are broken down to simpler compounds and some ATP is formed. d) During glycolysis (which takes place in the cytoplasm), six-carbon glucose molecules are broken down to simpler compounds and some ATP is formed. 4. The shape of an enzyme depends on a) the number of amino acids at the active site. c) the order of amino acids in its chain. b)the nucleotide to amino ratio in its chain. d) none of the above. 5. During enzymatic action, the enzyme a) chemically modifies the product. c) is used up. b) raises the energy needed for a reaction to occur. d) forms a temporary complex with the substrate. 6. Von Helmont’s experiment is a good demonstration of a) the importance of decomposition in the carbon cycle b) the fact that H, O and C make up the vast bulk of plant biomass c) how plants “purify” the air by taking in CO 2 and releasing O 2 8. The first part of the photosynthesis reaction captures light energy in the form of chemicals (ATP and NADPH) while the second part, called the Calvin cycle, a) releases that energy into the air c) traps carbon dioxide molecules to help produce sugar b) uses that energy to help produce sugar d) b and c are both correct 9. The main purpose or function of respiration is to a) make oxygen for animals to breathe c) manufacture sugar molecules b) increase the levels of carbon dioxide in the atmosphere d) release the energy locked up in sugar molecules 12. In the carbon cycle, ____ percent of photons are captured by plants for photosynthesis, and ______ percent of glucose is broken down by respiration. a) 1 and 36 b) 1 and 38 c) 1 and >99 d) 15 and >99 History of Life continued (8 questions) 13. The loss of cell walls by some prokaryotes was instrumental to the evolution of the eukarya because a) cell walls allow for external digestion c) cytosis allowed for the formation of membrane bound organelles b) cell walls got in the way of sexual reproduction d) peptidoglycan caused too many mutations