self test chapter 18 key

self test chapter 18 key - Self Test Chapter 18 Key 1.)...

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Self Test Chapter 18 Key 1.) Electron transport Complexes I, II, III and IV are all proton pumps. (A) True (B) False 2.) The final acceptor of the electron transport chain is H 2 O. (A) True (B) False 3.) Copper in its cuprous form is Cu 2+ . (A) True (B) False 4.) Cytochromes: (A) are copper binding proteins. (B) contain iron sulfur clusters. (C) are one of the components of electron transport complex I. (D) are 2 electron carriers. (E) are proteins with heme prosthetic groups. 5.) The type of gradient that drives ATP synthesis is: (A) an electron gradient (B) a sodium ion gradient (C) a potassium ion gradient (D) a pH gradient (E) a phosphate ion gradient 6.) The protein complexes in the electron transport chain that transfer electrons from succinate to O 2 are: (A) Complex I, Complex II, Complex III and Complex IV. (B) Complex I, Complex III, and Complex IV. (C) Complex II, Complex III, and Complex IV. (D) Complex I, Complex II and Complex III (E) None of the above 7.) The molecule shown to the left is (A) Reduced Coenzyme Q (B) FAD (C) FADH 2 (D) ubiquinone 8.) Which of the following takes place during electron transport? (A) Protons are pumped from the matrix into the intermembrane space. (B) Protons are pumped from the intermembrane space into the cytosol. (C) Protons are pumped for the intermembrane space into the matrix. (D) Electrons are pumped from the matrix into the intermembrane space. (E) Electrons are pumped from the intermembrane space into the matrix. 9.) Cyanide has been used for years to commit murder and is used in gas chambers in executions. Cyanide: (A) Inhibits electron transport in Complex III. (B) Uncouples electron transport from oxidative phosphorylation. (C) Inhibits ATP synthase. (D) Coordinates tightly with the heme iron of cytochrome a 3 . (E) Is a competitive inhibitor of enzymes that utilize NAD + as an oxidizing agent. O O O O CH 3 C H 2 H 3 C H 3 CC H H 2 CH 3 H 10
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10.) Acetyl-CoA labeled with 14 C as shown below is allowed to enter the citric acid cycle. Assuming that all of the acetyl-CoA enters the cycle, what fraction of the label will be present in oxaloacetate at the end of one turn of the cycle? (A) 100% (B) 75% (C) 50% (D) 25% (E) 0% 11.) Consider the information in Question 10. Which carbons in the oxaloacetate formed by one turn of the cycle would contain the radiolabel? (A) C1 (B) C2 (C) C1 and C4 (D) C2 and C3 (E) No radiolabel present. 12.) Consider the information in Questions10 & 11. What fraction of the original radiolabel present in the acetyl-CoA will be present in oxaloacetate at the end of two turns of the citric acid cycle? (A) 100% (B) 50% (C) 25% (D) 12.5% (E) 0% 13.) The mitochondrial inner membrane contains a transporter for: (A) NADH. (B) Oxaloacetate. (C) Phosphate (D) Acetyl-CoA (E) All of the above 14.) Cytochromes are iron-containing proteins that carry 2 electrons in the respiratory chain.
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This note was uploaded on 04/11/2010 for the course BICH bich 411 taught by Professor Bryantmiles during the Spring '10 term at Texas A&M.

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self test chapter 18 key - Self Test Chapter 18 Key 1.)...

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