EXAM 2 FA07-1

EXAM 2 FA07-1 - rrcrf^F. \,ta wII' E (z t t -2,^,e BIS 1...

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rrcrf^F. \,ta wII' E (z t -2,^,e BIS 110: The Cell FaIl2007 Exam Two 1. Write your name on the top of everv pase of the exam. rl 2. Read through the entire instructions carefully before you begn answering. 3. The exan is 17 pages long. Be sure you have everypage. 4. Pay attention to the number of points that each question is worth, and allocate your time accordingly. 5. There are atotal of 250 points on this exam. You have until the end of the scheduled class time to complete the exam *l
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I\ame: : ^1 i.J tLg G A1 LU_L Multiple Choices. Choose the alternative that best completes the statement or answers the question. (single answer) (2 points each, 40 points totar) I Acetyl CoA is (a) synthesized from pymvate in the mitochondrial intermembrane space. ,n, (b) the interme{i-at9 through which food molecules are completely metabolized to carbon dioxide in animal cells. and CoA in a reaction that also generates NADH , COz, and ATP. (d) by the breakdown of fatty acids in the cytosol. (e) an intermediate in the oxidation of glucose in anaerobic skeletal muscle. 2 During a single turn of the citric acid cycle the two carbon atoms from acetyl CoA that enter the cycle are completely oxidized to COz. three molecules of ATp are generated. /-t (q of NADH are generated. ( , @ an acetyl group is added to citric acid. \/ threemolecules of COz are,generated: 3 The advantage to the cell of the gradual oxidation of glucose during cellular respiration compared with its combustion to Coz and H2o in a single step is mofe free energy is released for a given amgunt oxidized. JA. no energy is lost as heat. (Q> energy can be extracted in usable amounts. more COz is produced for a given amount ' less oz is required for a given amount of glucose I 4 In anaerobic conditions, skeletal muscle produces lactate and CO2. ethanol and COz. @ laptate only. lactate, ethanol, and COz. 5 In mammals, liver cells are able to convert lactate to pynrvate. What purpose does this serve for the organism? It is an important way of generating more NADH for the organism. NAD*. It allows the organism to grow conditions. to be productively utilized. important way for the body to generate heat. # (d) (e) 6
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I / Pymvate can be converted into many other molecules by various biosynthetic and metabolic pathways, which makes it a central hub in the regulation of cellular metabolism. Which of the following molecules is not made from pynrvate? (a) Oxaloacetate , (b) Ethanol j @' NADH (d) Lactate (e) Acetyl CoA 7 Which of the following is NOT an electron carrier that participates in the electron transport chain? Cytochrome Quinone @ Rhodopsin (d) Copper ion Iron-sulfur center Proteins destined to enter the endoplasmic reticulum are transported across the membrane after their synthesis is complete. Ja are sSmthesized on free ribosomes in the cytosol. (9 begin to cross while still being synthesized. crq$s in a folded state. all'remain within the endoplasmic reticulum. Cells oxidizing acetyl groups via the citric acid cycle require molecular oxygen in order to (A r oxidize the acetyl groups to COz. ' regenerate NAD*. \ @' regenerateNAD*. \l (c) FADH2. ' / CoA.
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EXAM 2 FA07-1 - rrcrf^F. \,ta wII' E (z t t -2,^,e BIS 1...

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