2006_Exam_2_Q&A - Version 2 Bio2600 Introduction to...

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Bio2600: Introduction to Cell Biology name: Oct., 2006 Exam 2 Section 1: Complete each sentence with the either one of the response found between the square brackets [A. /B. ]. 1. In muscle cells, [A. creatine phosphate/B. starch] is used to store excess energy in a form readily converted to ATP. 2. Selective membrane doc king by transport vesicles is dictated by interactions between (A. vesicle and target SNARES/ B. adaptin and clathrin.) 3. New plasma membrane re aches the cell surface by [A. regulated/B. constitutive] secretion. 4. (A. Lysosomes/B. Phago somes) are the organelles specialized for breaking down cellular debris into its monomer units. 5. The majority of a cell's energy content is represented in the concentration of [A. pyruvate/ B. acetyl-CoA] in the cell. 6. Hydrolysis of GTP by a G-protein is prevented by [A. cholera toxin/B. purtussis toxin] binding to the alpha subunit. 7. [A. Paracrine/B. Endocrine] signals are secreted by one cell to act locally on adjacent cells without necessarily entering the blood stream. 8. Cytochrome c carries electrons using [A. an iron-sulfur group/B. a heme group]. 9. Calcium and cAMP are both considered [A. first/B. second] messengers. 10. Activation of Receptor Ser-Thr kinases results in alterations in gene expression through relay molecules called [A. SMADs/B. STATs]. 11. [A. An endosome/B. A lysosome] is a vesicle first created at the cell membrane. 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. The characteristic feature of Receptor tyrosine kinases is the presence of [A. a kinase domain/B. a kinase binding domain] in the cytoplasmic region of the receptor. 14. 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. 15. In aerobic conditions the end product of glycolysis is normally shuttled to enzymatic pathways involved in [A. oxidative phosphorylation/B. fermentation]. 16. In steps 6 and 7 of glycolysis, the net reaction is the conversion of [A. a carboxylic acid to an aldehyde/B. an aldehyde to carboxylic acid]. Page 1, v2
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17. During import of a protein into the endoplasmic reticulum (ER), the signal sequence is removed using a proteolytic enzyme residing [A. in the lumen of the ER/B. on the cytosolic side of the ER]. 18. A small hydrophobic signaling molecule would likely bind to a receptor [A. in the cytosol/B. in the cell membrane]. 19. Most cytochromes have a higher redox potential (higher affinity for electrons) than iron-sulfur centers, which is why the cytochromes tend to serve as electron carriers (A. near the O 2 end of the respiratory chain/B. further away from the O 2 end of the respiratory chain). 20. [A. Complex III/B. The ATP Synthase] is the site of action of cyanide.
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  • Adenosine triphosphate, A., a. b. c., D B E B B C C A C E B D

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