2008 Exam 2 Answers

2008 Exam 2 Answers - Bio2600 Introduction to Cell Biology...

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Bio2600: Introduction to Cell Biology March 4, 2008 Exam 2 Section I: Complete each of the following sentences with one of the two choices available between the square brackets [A. /B. ]. 1. Proteins are transported out of the cell via the [A. endocytic/B. exocytic] pathway. 2. Each respiratory enzym e complex in the electron-transport chain has a (A. lesser/ B. greater) affinity for electrons than the one immediately before it. 3. In most cell types, [A. pinocytosis/B. phagocytosis] is primarily responsible for counteracting the membrane expansion caused by secretory activity. 4. The majority of a cell's energy content is represented in the concentration of [A. pyruvate/ B. acetyl-CoA] in the cell. 5. [A. True/B. False] The citric acid cycle does not make use of molecular oxygen and therefore, it is considered to be part of anaerobic metabolism. 6. In aerobic conditions the end product of glycolysis is normally shuttled to enzymatic pathways involved in [A. oxidative phosphorylation/B. fermentation]. 7. The en bloc addition of a 14 sugar backbone to a protein occurs in the [A. Golgi/B. Endoplasmic Reticulum]. 8. The molecule NAD+ is [A. oxidized/B. reduced] when it becomes NADH. 9. New plasma membrane re aches the cell surface by [A. regulated/B. constitutive] secretion. 10. While both are important, the major determinant of organelle identity is the specific composition of (A. phospholipids/B. proteins) within the membrane. 11. Pyruvate is converted to acetyl-CoA using the enzyme [A. pyruvate dehydrogenase/B. NADH dehydrogenase]. 12. During the first three steps of glycolysis, the cell must use (A. one/B. two) molecules of ATP before an intermediate (fructose-1,6-bisphosphate) is created that eventually yields energy. 13. Selective formation of vesicles at the golgi membrane is dictated by interactions between (A. vesicle and target SNARES/ B. adaptin and clathrin.) 14. Because the 1,3-bisphosphoglycerate produced at the end of step 6 has approximately 11.7 kcal/mole of energy "stored" in the phosphate bond, this step in glycolysis can produce [A. one/B. two] ATP molecule(s) per molecule of 1,3-bisphosphoglycerate. 15. In the electron transport chain, a lipid soluble electron carrier called [A. ubiquinone/ B. cytochrome C] carries electrons within the lipid bilayer. Section II: Multiple Choice. Choose the single BEST answer. Page 1, v2
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16. Oxidative phosphorylation A. links ATP synthesis to the consumption of molecular O 2 . B. harnesses the energy of the proton gradient to pump electrons across the inner mitochondrial membrane. C. requires electrons to be pumped into the intermembrane space. D. A and B E. A, B and C 17. In the figure below of a typical organelle, the part labeled 2 A. accepts vesicles from the ER B. can on occasion send proteins with an ER retention sequence back to the ER. C.
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This note was uploaded on 04/27/2008 for the course BIO 2600 taught by Professor Vanburkem during the Winter '08 term at Wayne State University.

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2008 Exam 2 Answers - Bio2600 Introduction to Cell Biology...

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