Exam4s06 - CH 369 Exam 4 Multiple Choice 1 The structure of chlorophyll a is similar to that of the heme group of hemoglobin except the central

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CH 369 Exam 4 Multiple Choice 1) The structure of chlorophyll a is similar to that of the heme group of hemoglobin, except the central atom in hemoglobin is iron and the central atom in chlorophyll is a) magnesium b) manganese c) zinc d) phosphorous e) cobalt 2) Which of the following is a result of the “light reactions” of photosynthesis? a) The oxidation of water b) The reduction of NADP + c) Generation of a transmembrane proton gradient d) ATP production e) all of these 3) In the generation of the proton gradient in photosynthesis, protons are pumped from the _______________ to the ___________________ of the chloroplasts. a) thylakoid lumen / stroma b) stroma / thylakoid lumen c) inner membrane / stroma d) stroma / inner membrane e) stroma / outer membrane 4) The C 4 pathway has evolved in some tropical plants. What is the purpose of this pathway? a) To reduce photorespiration b) To supply CO 2 to rubisco-rich bundle sheath cells c) To allow plants to stockpile CO 2 d) All of these e) None of these 5) Which statement is true about β -oxidation of an even chain fatty acid? a) Acetyl units are cleaved from the methyl end of the fatty acid. b) Each round in the pathway reduces the acyl-CoA by 3 carbons. c) Each round in the pathway creates one QH 2 , one NADH, and one acetyl-CoA. d) All of these. e) None of these. 6) Which of the following provides energy for fatty acid synthesis from acetyl-CoA onward? a) ATP b) NADH c) FADH 2 d) NADPH e) None of these
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7) Transamination enzymes require this vitamin or intermediate: a) biotin b) pyridoxal c) folic acid d) s-adenosyl methionine e) None of these 8) In a transamination reaction, ___________ is produced from pyruvate. a) alanine b) aspartate c) glutamate d) glycine e) valine 9) Some enzymes have evolved such that reactants are moved from active site to active site within the enzyme so as to prevent the loss of intermediates. This is technically known as _________________. a) tunneling b) channeling c) filtering d) transporting e) None of the above 10) The first step in purine nucleotides synthesis is a) the phosphorylation of ribose-5-phosphate. b) the reaction to convert IMP to ATP or GTP. c) synthesis of IMP from amino acids. d) attachment of IMP to ribose ring e) None of the above 11) A pH gradient between the stroma and the lumen is established when a) electrons from photosystem II are transferred through cytochrome b 6 f. b)
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This note was uploaded on 02/16/2010 for the course CH 369 taught by Professor Kbrowning during the Spring '07 term at University of Texas at Austin.

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Exam4s06 - CH 369 Exam 4 Multiple Choice 1 The structure of chlorophyll a is similar to that of the heme group of hemoglobin except the central

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