2007 Exam 2 Answers

2007 Exam 2 Answers - Bio2600: Introduction to Cell Biology...

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Bio2600: Introduction to Cell Biology Oct., 2007 EXAM 2 Section 1: Complete each of the following sentences with one of the two choices found in the square brackets [A. /B.]. 1. [A. Paracrine/B. Endocrine] signals are secreted by one cell to act locally on adjacent cells without necessarily entering the blood stream. 2. The hormone Insulin is secreted fr om pancreatic cells using the [A. regulated/B. constitutive] exocytosis pathway. 3. The majority of a cell's energy content is represented in the concentration of [A. pyruvate/ B. acetyl-CoA] in the cell. 4. In aerobic conditions the end product of glycolysis is normally shuttled to enzymatic pathways involved in [A. oxidative phosphorylation/B. fermentation]. 5. In muscle cells, the standard free energy for the phosphate group in creatine phosphate is [A. higher/B. lower] then the value for ATP. 6. [A. Purtussis toxin/B. Cholera toxin] preferentially binds to the Gs subunit in the gastrointestinal tract. 7. The head group (lollip op) of ATP synthase is located in the (A. inner membrane space/ B. matrix). 8. Electrons are carried by iron-sulfur centers in complexes [A. close to/B. further away from] the NADH end of the electron transport chain. 9. 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. 10. Calcium and cAMP are both considered [A. first/B. second] messengers. 11. 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. 12. Insulin, a small hydrophillic peptide will bind to a receptor [A. in the cytosol/B. in the cell membrane]. 13. The en bloc addition of a 14 sugar backbone to a protein occurs in the [A. Golgi/B. Endoplasmic Reticulum]. 14. The proteins that function downstream of a G-protein coupled receptor are known as (A. monomeric/B. trimeric) GTPases. 15. In most cell types, [A. pinocytosis/B. phagocytosis] is primarily responsible for counteracting the membrane expansion caused by secretory activity. 16. The higher the redox p otential of a redox pair, the (A. higher/B. lower) its affinity for electrons. Page 1, v2
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17. Adipose tissue stores [A. more/B. less] energy then glycogen and does so in a more compact state. 18. Pyruvate is converted to acetyl-CoA using the enzyme [A. pyruvate dehydrogenase/B. NADH dehydrogenase]. 19. 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]. 20. 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. Section 2:
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This note was uploaded on 04/27/2008 for the course BIO 2600 taught by Professor Vanburkem during the Fall '08 term at Wayne State University.

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2007 Exam 2 Answers - Bio2600: Introduction to Cell Biology...

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