Ex2+ANSkey[1] - Bio2600: Introduction to Cell Biology Oct.,...

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Bio2600: Introduction to Cell Biology Name: Oct., 2005 EXAM 2 Section 1: Finish each sentence with one of the two words found in square brackets and separated by a slash [A. /B. ]. 1. In most cell types, [A. pinocytosis/B. phagocytosis] is primarily responsible for counteracting the membrane expansion caused by secretory activity. 2. The higher the redox p otential of a redox pair, the (A. higher/B. lower) its affinity for electrons. 3. Proteins are transported out of the cell via the [A. endocytic/B. exocytic] pathway. 4. The en bloc addition of a 14 sugar backbone to a protein occurs in the [A. Golgi/B. Endoplasmic Reticulum]. 5. The most important con tribution of the citric acid cycle to energy metabolism is the extraction of high-energy electrons during the (A. oxidation/B. reduction) of acetyl CoA to CO 2 . 6. 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 molecules. 7. Calcium and cAMP are both considered [A. first/B. second] messengers. 8. Steroid hormones bind to receptors present (A. in the cytosol/B. on the plasma membrane). 9. In the electron transport chain, a lipid soluble electron carrier called [A. ubiquinone/ B. cytochrome C] carries electrons within the lipid bilayer. 10. While a cell is more efficient than man-made machines in converting energy, the excess energy not captured by the cell is detected as [A. heat/B. light]. 11. Activation of the cytoplasmic tyrosine kinases (JAKs) activates [A. SMADs/B. STATs] which then enter the nucleus to alter gene activity. 12. Insulin is secreted fr om pancreatic cells by the [A. regulated/B. constitutive] exocytosis pathway. 13. During the breakdown of fatty acid chains, the production of one acetyl-CoA molecule shortens the fatty acid chain by [A. one/B. two] carbon groups. 14. The acidic environment of a lysosome is maintained by proton pumps (a H + -ATPase) that move protons [A. out of/B. into] the lumen of the lysosome. 15. Adipose tissue stores [A. more/B. less] energy then glycogen and does so in a more compact state. Section II: Multiple choice. Choose the best answer based on your knowledge of cell biology. Page 1, v2
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16. Which intracellular transport system uses energy? A. mitochondrial transport B. vesicle transport C. ER signal sequence transport D. nuclear transport E. all of the above 17. When activated, for example downstream of a G-protein coupled receptor, Phospholipase C activity produces A. PIP 2 B. IP 3 C. DAG D. B and C E. A, B and C 18. The cytochrome oxidase complex A. pumps protons out of the matrix B. uses a heme-Fe group at its active site. C.
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Ex2+ANSkey[1] - Bio2600: Introduction to Cell Biology Oct.,...

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