Egg_2_2009_key

Egg_2_2009_key - BIBC 102 FINAL KEY with corrections SPRING...

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BIBC 102 – FINAL KEY with corrections PORTIA METABOLOSO SPRING QUARTER 2009 6/11/2009 2 1. The pentose phosphate pathway A) oxidizes glucose at the 6 carbon B) oxidizes glucose at the 1 carbon C) reduces NAD+ D) generates PRPP as a product 2. Complex I: A) gets electrons from NADPH B) generates NADH C) donates electrons to succinate D) produces ubiquinol 3. Lipoic acid A) will accept electrons and carry an acetyl group B) will accept electrons C) will carry an acetyl group D) will covalently react with pyruvate 4. Molecules A, B, and C, have reduction potentials of -.23, -0.1 and +.34 electron volts, respectively, in the cell. If they are involved in a set of sequential reactions that allow electrons to be passed from one to the next, which order delivers the most energy? A) electrons are passed from B to C, then from C to A B) electrons are passed from A to B, then from B to C C) electrons are passed from C to B, then from B to A D) electrons are passed from A to C, then from C to B 5. UDP-glucose A) directly donates a glucose to start a glycogen chain B) transfers phosphate to other molecules C) is a substrate in the Calvin cycle D) accepts electrons during the Krebs cycle 6. Glycogenin A) is the form of glycogen with no branches B) is a relative of glycogen found in plants C) is a drug that inhibits glycogen production D) is a protein that initiates glycogen synthesis 7. Which anapleurotic enzyme includes oxaloacetate as a product A) PEP carboxylase B) pyruvate kinase C) PEP kinase D) pyruvate carboxylase
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BIBC 102 – FINAL KEY with corrections PORTIA METABOLOSO SPRING QUARTER 2009 6/11/2009 3 8. The F 0 subunit of the ATP synthase A) is reduced by electrons as they reach the end of the respiratory chain B) binds both ADP and ATP C) is found in the intermembrane space of the mitochondrion D) transports protons across the membrane 9. There are two enzymes which we lack that allow plants and microorganisms to make glucose from fat. What are they called? A) Isocitrate lyase and malate synthase B) Isocitrate dehydrogenase and malate synthase C) Isocitrate mutase and malate synthase D) Isocitrate lyase and glyoxalate synthase 10. The PDH complex A) is found in the cytosol of mammalian cells B) uses PLP to convert pyruvate into alanine C) uses TPP, lipoic acid, FAD, and NAD + as cofactors D) does not function in absence of oxygen 11. The cofactor TPP A) activates CO 2 for a number of transfer reactions B) functions in moving amino groups from one molecule to another C) attacks carbonyls with a nitrogen nucleophile, allowing catalysis D) uses a carbanion to attack carbonyl groups on substrates 12. The pictured structure is part of what cofactor A) NAD B) PLP C) TPP D) biotin 13. What molecule includes is this structural motif? A)
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Egg_2_2009_key - BIBC 102 FINAL KEY with corrections SPRING...

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