Exam 2 Spring 07

Exam 2 Spring 07 - Your Name: .4“ 7__ TA’s Name: N l...

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Unformatted text preview: Your Name: .4“ 7__ TA’s Name: N l Spring 07 BISC 220 Lecture Exam 2 March 2, 2007 Instructions: Use of the Blue Scantron Answer Sheets; PENCIL ONLY 1. Enter yOur name in the NAME field, and fill in the appropriate bubbles. 2. 'lilnter your USC STUDENT ID NUMBER (not your Soc. Sec. No.) in the field labeled IDEN'J‘IFICATION NUMBER, and fill in the bubbles. You need not enter any of the other information (sex, grade, birthday, etc). 3. Enter the code for your TA’s name in column KL in the field SPECIAL CODES. Use the following codes: __r__ First Name Last Name Code for _ W Colu mu KL Gorj 2mg Bczmalinovic _>_ 00 _ _ Carlos Cabrera 7 01 7 Jason_ “Hoskin m 02 Kun (Mark) N Qian r 03 Nicole _ Reece 04 Chunli . Ren __ ()5 Justin Schneidermgln 06 7 Erica V __Seubert " r ()7 Yanbing (Bing Bing) Wang I ()8 Han Wang W l ()9 Jeff ‘ ___Wurfel _ _lO 4. Enter your answers on the front side of the sheet (with the NAME fields, etc., starting at #1). Be sure to bubble plainly. If you erase, do so cleanly. Instructions for the Written Portion of the Exam: 1. ONLY tests written in PEN are eligible for regrade‘ Answers written in pencil will not be regraded. 2. ONLY answers written in the boxes provided under the question will be graded. Writings outside the boxes will not be graded. 2. Write your name and your TA’s name in the space provided on each page. 3. When you are done, turn in the entire exam with the Blue Scantron Answer Sheet to your TA. Second Hourly Examination BISC 220 Spring 2007 2 March 2007 Please ‘ r A' 51GB cc JH KQ R JS ES YW HW Name ID Num This examination has 9 pages and 37 questions. Be sure you have a complete examination. Please put your name and ID on the top of each page. Remember to use your time wisely during the examination period. Good luck from ail your teaching staff. The following 35 multiple choice questions are worth 3 points each. Please CLEARLY write your answer on the front side of the machine—grading form. This is the only section of the examination that uses the machine-grading form; for all the rest of the exam, please write your answers directly on the pages of the exam. 1. The reaction—center chlorophyll ofphotosystem I is known as P700 because there are 700 chlorophyll molecules in the center. ‘ . B) this pigment is best at absorbing light with a wavelength of 700 nm. )there are 700 photosystem I components to each chloroplast. i) it absorbs 700 photons per microsecond. ) the plastoquinone reflects light with a wavelength of 700 nm. J i @n animal cells, hydrolyu'c enzymes are packaged to prevent general destruction of cellular components. ' hich of the following organelles filnctions in this compartmentalization? A) chloroplast ’ C) central vacuole E) glyoxysorne B) lysosome D) peroxisorne ' 3. Which of the following ntains enzymes that transfer hydrogen from various substrates to oxygen, producing H202. A. lysosome C. mitochondrion E. peroxisome B. vacuole D. Golgi apparatus 4. Which of the following is a place whe@NA\¥-L ‘ a. cell? <5 mmmmm m bggggriets: re—zm/zédy to be found in my! type of /K}/stroma of chloroplasts V _ cytoplasm [7/ 'tochondrial matrix olgi apparatus fideos 5. Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle was a nucleus with 4.5 picograms of DNA? A) G0 ' B) G1 C) s D) G2 E) M 6. One carbon dioxide molecule reacts in each "turn" of the Calvin cycleJ—low many turns of the cycle are required for the synthesis of one glucose molecule? A) 1‘ _ B) 2 D) 6 E) 12 Page 1 PleasecircleyourTA'sinltials: GB CC JH KQ NR CR JS ES YW HW JW Name ID Number 7. The lateral mobility (fluidity) of lipids and proteins in membranes is a consequence of A) lack of covalent bonds between the lipid and protein components of the membrane. B) weak hydrophobic interactions among thefomponents in the interior of the membrane. Q’fhe presence of liquid water in the interior of the membrane. ma and B only E) A, B, andC 8. Consider the following: Succinate dehydrogenase catalyzes the conversion of succinate to fmnarate. The reaction is inhibited by malonic acid, which resembles sucgiggt‘eibut cannot be acted upon by juccingte dehydrogenase. Increasing the ratio of succinate to malonic acid reduces the inhibitory effect of malonic acid. Which of the following is correct? - Muccinate dehydrogenase is the enzyme, and fumarate is the substrate. ,B‘TSUCCinate dehydrogenase is the enzyme, and malonic acid is the substrate. C) Succinate is the substrate, and fumarate is the product. Wumarate is the product, and malonic acid is anoncompetitive inhibitor. /E’)/Malonic acid is the product, and furnarate is a competitive inhibitor. C9. he solutions in the arms of a U—tube (below, right) are separated at the bottom of the tube by a embrane that is permeable to sodium chlgm’de but not to glucose. Side A is filled with a solution of 0.4 M glucose and 0.5 M sodium chloride (N aCl), and side B is filled with a solun'on containing 0.8 M glucose and r 0.4 M sodium chloride. Initially, the volume in both arms is the same. Side Side A, Initial setup 5 At theZefimaing of the experiment, ) Sid A is hypertonic to side B.- side A is hypotonic to side B. C) side A is isotonic to side B. M side A is hypertonic to side B with respect to \ 9.3 M’ glucose 0.4 def glucose 0.4 M NaCl glucose. 0.5 M NaC1 /E’)’ side A is hypotonic to side B with respect to sodium chloride. Membrane 10. Which of the following characterizes the sodium— potassium pump? .ngdium ions are pumped out of a cell against their gradient. x t; LB, otassium ions are pumped into a cell against their gradient. NA @1116 pump protein undergOes a conformational change. D) Only A and B are correct. E) A, B, and C are all correct. Based on the models of uptake you have studied, which of the following experimental treatmsnts would most likely increase the rate of sucrose trans ort into a cell? V decreasing exuam decreasing extracellular pH ) decreasing cytoplasmic pH D) adding an inhibitor that blocks the regeneration of ATP E) adding a substance that makes die membrane more permeable to hydrogen ions Page 2 PleasecircleyourTA’sinitials: GB CC JH KQ NR CR JS ES YW HW JW Name ID Number 12. Whenever energy is transformed, there is always an increase in e—rré’lmz’l“; \r A) free energy of the system. entro y of the uni® B) free energy of the universe. E) enmdpfl?£€dfi%ge. C) entropy of the system. 13. When 10,000 molecules of ATP are hydrolyzed to ADP and P1. in a test tube, about twice as much heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of the following is the best explanation for this observation? [—q A) Cells are open systems, but a test tube is a closed system. B) Cells are less efficient at heat production than nonliving systems. C) The hydrolysis of ATP in a cell produces different chemical products than does the reaction in a test tube. . D) The reaction in cells must be catalyzed by enzymes, but the reaction in a test tube does not need enzymes. E) Cells convert some of the energy of ATP hydrolysis into other forms of energy besides heat. 14. During which phases of mitosis are chromosomes composed of two chromatids? A) from inter-phase through anaphase Q B) from G1 of interphase through metaphase , C) from metaphase through telophase ‘ D fiom anaphase through telophasc , om G2 of interphase through metaphase 15. In the chemical reaction A + B —> C + D (below), which of the following statements 5le describes the reaction? Wdhm -———> u n 2))? amount of free energy initially present in the reactants is indicated by a. " 'l I e amount of free energy present in the products is indicated by e. /G The amount of free energy released as a result of the noncatalyzed reaction is indicated by "c." he amount of free energy released as a result of the catalyZed reaction is indicated by "d." E) The difference between "b" and "c" is the activation energy added by the presence of the enzyme. Please circleyour‘TA's initials: GB CC JH KQ NR CR JS ES YW HW JW ‘Name ID Number ' 16 Which of the following statements correctly describes the following reaction? zmw’- , C6H1206 + 602 ~—> 6CO2 + 6HZO + Energy @ C6H1206 is oxidized and O2 is reduced. B) 02 is oxidized and H20 is reduced. C) C02 is reduced and O2 is oxidized. D) CanO6 reduced and CO2 is oxidized. E) 02 is reduced and CO2 is oxidized. 17. Which kind of metabolic poison would most directly interfere with _l is? A) An agent that reacts with oxygen and depletes its concentration in the cell An agent that binds to pyruvate and inactivates it , An agent that closely mimics the structure of glucose but is not metabolized D) An agent that reacts with N ADH and oxidizes it to NAD+ , " E) An agent that blocks the passage of electrons along the electron transport chain @How many ATP molecules could be made through substrate-level Ehosghoryladon Elus oxidative o 5 ho lation chemiosrnosis) if you started with three molecules of succinyl CoA and ended with oxaloacetate? Rrfir to Zbefigurc e w) a: n 3212213. ‘*““"‘“““"”’“M M mew-am Acetyl (IDA .— L‘- Omloaceiale M“?ch NADH x} 7a. /" Quite » ' KAI? 1' X 5+5x+3wzl »¢’ % J ’l ‘ - lsocitmte Mfihle x) i mete A, XNAW l- coa a l NADH “wane; ‘ lL ( View I; \‘x Cfi- Keiogluiguaja ‘ / s .i I” ma: mam Air‘é‘fiaminyi CeAf’J 4mm 5 f ADP + F1 19. What is the primary function of the light reactions of photosynthesis? A to produce energy—rich glucose from carbon dioxide and water frf’IB):to produce ATP and NADPH \C to produce NADPH used in respiration D) to convert light energy to the chemical energy of PGAL to use ATP to make glucose 5 ffi'bl’lL 5 N REPS ‘ \ r3992 ‘ \ti‘ Mm K M M if” ")'V 67 \ :7 Page 4 Please cireieyourTA'sinitials: GB CC JH KQ NR CR JS ES YW HW JW Name ID Number W the following statements about the cytoskeleton is income? e dynamic aspect of cytoskeletal function is made possible by the assembly and disassemny of a few simple types of proteins into large aggregates. B) Microfilaments are structurally rigid and resist compression, While microtubules resist tension (stretching). 7 _ ovement of cilia and flagella is the result of motor proteins causing microtubules to move relative to each other. /B) Chemicals that block the assembly of the cytoskeleton would prevent many different processes in cells. E) Transport vesicles among efiaembranes of the endomernbrane system depend on the function of m the cytoskeleton. ’I‘ 21. The figure (below) presents the amount of DNA in a sample of simultaneously dividing cells At the end of which stage does MPF reach its threshold concentration? Amount of DNA in nucleus < first cycle x Eemd Ede > A) I B) H D) IV E) V i 22. During aerobic cellular respiration, a proton gradient in mitochondria is generated by and used pfirnaril or . . e electron transport chain; ATP synthesis 3) the electron transport Chain; substratealevel phosphorylation C) glycolysis; production of H20 3) fermentation; NAD+ reduction E) diffusion of protons; ATP synthesis 23. What is the change in free energy of a system at chemical equilibrium? A) slightly increasing B) greatly increasing C) slightly decreasing ‘ D) greatly decreasing 3) no net change Pleasecircle yourTA's initials: GB CC JH KQ NR CR JS ES YW HW JW Name ID Number 24. The volume enclosed by the plasma membrane of plant cells is often much larger than the corresponding volume in animal cells. The most reasonable explanation for this observan'on is that A) plant cells are capable of having a much higher surface—to—volume ratio than animal cells. plant cells have a much more highly convoluted (folded) plasma membrane thananinial/cells. plant cells contain a large vacuole that reduces the volume of the cytoplasm. ‘ animal cells are more spherical, while plant cells are elongated. ,Ej/the basic functions of plant cells are very different fiom thoSe of animal cells. 25. Testosterone functions inside a cell by p A acting as a signal receptor that activates ion—channel proteins. ’ binding with a receptor protein that enters the nucleus and activates specific genes. acnng as a steroid signal receptor that activates ion—channel proteins. D) becoming a second messenger that inhibits adenylyl cyclase. E) coordinating a phosphorylati’on cascade that increases glycogen metabolism. 26. Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes? A) the splitting of water B) the absorption of light energy by chlorophyll C the flow of electrons from photosystem II to photosystem I the synthesis of ATP @the reduction of NADP+ 27. Which of the following is (are) true of ligantggateid/ion ghagpels? @They are important in the nervous system. B) They lead to changes in spflqtn and calcium concentrations in cells. @They open or close in response to a chemical signal. D) Only A and B are true. E) A, B, and C are true. he general name for an enzyme that transfers phosphate groups from ATP to a protein is 5' A) p osphorylase. hosphatase. ) rotein kinase. l TPase. y/protease. 29. It is possible to prepare vesicles from portions of the inner membrane of the mitochondrial components. Which one of the following processes could sn'll be carried on by this isolated inner membrane? A) the citric acid cycle _ 1 Wm B) oxidative phosphorylation C) glycolysis and fermentation D) reduction of NAD+ E) both the citric acid cycle and oxidative phosphorylation Page 6 Name ID Number 30. Caffeine is an inhibitor of phos hodie 7 herefore, the cells of a person who has recently consumed coffee would have increased levels of A) phosphorylated proteins. B) GTP. W3 C) CAMP. D) adenylyl cyclaSe. / E) activated G proteins. 31. The response of a particular cell to a signal depends on particular collection of signal receptor proteins. 4' . ' relay proteins. proteins needed to carry out the response. ) A and B only E)A,B,andC 32. The top circle in the figure below shows a diploignucleus with four chromosomes. There are two pairs of homologous chromosomes, one long and the oWUHe haploid set is symbolized as black and the other haploid set is gray. The chromosomes in the top circle have not yet replicated. The cells lettered A to E depict chromosomal configurations that are characteristic of various stages of mitosis of the top cell. Which ‘ of the lettered cells depicts one dau hter nucleus at telo base of mitosis? Centremere 33. As a research scientist, you measure the amount of ATP and NADPH consumed by the Calvin cycle in 1 hour. You find 30,000 molecules of ATP consumed, but only 20,000 molecules of NADPH. Where did the extra ATP molecules come from? A) photosystem II ' B) photosysteml C) cyclic electron flow D) noncyclic electron flow E) chlorophyll Page 7 r Please circleyourTA‘s initials: ‘GB cc JH KQ NR CR JS ES YW HW JW Name ID Number 34. The following data were obtained from a study of the length of time spent in each phase of the cell cycle by cells of three eukaryotic organisms designated Beta, Delta, and Gamma. Minutes Spent in Cell Cycle Phases Organism Gl 3 Jr 62 M . | Beta 1 8 24 _1_2_ 16 Delta 1 00 O 0 0 Gamma 1 1 8 48 14 20 _ The best conclusion concerning Delta is that the cells A) contain no DNA. B) contain no RNA. C ontain only one chromosome that is very short. actually in the G0 phase. ) divide in the G1 phase. 35. Which of the following is a reasonable explanation for why unsaturated fatty acids help keep any membrang more fluid at lower temperatures? V .‘_ The double bonds form a kink in the fatty acid tail, forcing adjacent lipids to be further apart. Bfi/Unsaturated fatty acids have a higher cholesterol content. :fiy"finsaMated fatty acids permit more water in the interior of the membrane. D) The double bonds block interaction among the hydrophilic head groups of the lipids. ' {E} The double bonds result in a shorter fatty acid tail. Please write your answers for the following questions on these pages, and confine your answers to the space provided (lest you incur the wrath of the instructors). The space is sufficient for an excellent answer. _ . , {I a lie 5 l» l 5 «l W 36: (5 points) Certain organisms that use only glycolysis for metabolic enel (cannot carry out electron transport and oxidative phosphorylation) interact with iron atoms initheir immediate environment. What do these organisms do to the iron? Why? Please circleyourTA'sinitials: GB CC JH KQ NR CR JS ES YW HW JW Name ID Number 37. (3 points each) Define each of the following with a phrase or bdef sentence. a. PDGF 7 . Wth )5 A ' flora/WE b. kinetochore Ljv’ / _ )3 'Wngmfak 5W 717W 1L "" 4/ a b (gt/j (19/ mam/{N 71% Wwfiflfififififingfgmg 75 5/7‘6 4M 1% M WfiD/Vg. 575%?“ C” c. allostefic interaction [— ficwflmpbw rmh‘ahkd (lawffi ' 1Z3 M4415?ch proEn—g pquk“; A L , at \m , V - 5M“$$fififi3@fififiwfifififi{ ‘ K kn... \IQ a Page 9 ...
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Exam 2 Spring 07 - Your Name: .4“ 7__ TA’s Name: N l...

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