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Past Midterm - March 2007 (with answers)

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Biology 1002B
Tom Haffie

March 2007 Biology 022 Page 1 of 13 March Midterm Analysis1 Which of the following statements about photosynthesis is correct A Photosynthesis takes place only within chloroplasts B About 10 of global primary productivity occurs in the oceans C Photosynthesis is an endergonic process D Most primary productivity in the ocean occurs in warm waters E Photosynthetic rate can be determined by measuring the rate of CO produced or O 22consumedWhy Cneed energy light thus endergonic Why not Dphotosynthesis consumes CO2 and produces O22 Imaging that NASAs Spirit rover has discovered a photosynthetic bacterium on Mars that contains a single pigmentBy using an onboard spectrophotometer the pigment is found to have the absorption spectrum shown belowFrom this spectrum which of the following statements is correct10 Absorbance0 BlueGreenRedA The pigment is green in colour B The pigment absorbs red light C Electrons in the pigment are excited by only blue photons of light D The pigment is red in colour E The pigment transmits green lightWhy DThe pigment does not absorb red lightthus it must be red in colour Why not APigment absorbs in the green thus it is not green in colour 3 What is it about the structure of heme shown here that makes hemoglobin a respiratory pigmentA A Fe atom B CH bonds C Two O binding sites 2D Conjugated double bonds E Hydrophobic tail Why DAll pigments possess conjugated double bonds is correct Why Not Adoesnt make it a pigment but okay 05 marks Student numberCode 111Code 111Code 111Code 111March 2007 Biology 022 Page 2 of 134 Ifthe energy of a photon is equal to the energy required for an electron within a pigment molecule to move from the ground state to the lowest excited state then which of the following statements is correct A If the pigment molecule is chlorophyll a then the photon must be red B The energy of the photon will not be absorbed C The pigment molecule will fluoresce blue light D If the pigment is a carotenoid then the energy of the photon is very low E The energy of the photon will be lost as heat Why AGrothus Draper lawenergies match so photon must get absorbedLowest excited state if Chla must be redWhy not ENot necessarily not best answer but part mark 05 awarded 5 Given a preparation of isolated chloroplasts which one of the following treatments would result in the thylakoid lumen having the lowest pHA Incubation in complete darkness B Low light and a high stromal ADP concentration C High light and inhibition of ATP synthase D High light and incubation with a protonleaking ionophore E Low light and incubation with DCMU a compound which prevents electron transfer from P680 to PQWhy C Lots of light lots of proton pumping but no way to dissipate gradient Why not AIn dark no electron transport therefore no gradient is established 6 Which of the following statements is correctA P680is reduced to P680 by donation of an electron from O 2B Absorption of one photon is required to move one electron from P680 to NADP C PSII is not required for the synthesis of ATP using cyclic electron transport D P680 is more easily oxidized than P680 E The results of the Jagendorf experiment proved that in an intact plant cell light is not required for the photosynthetic production of ATP Why COnly PSI used for cyclic ET Why not ENeed free energy to make ATP in an INTACT plant cell If light is not required where does the free energy come fromThe results of the experiment showed that light was used to make ATP by producing a proton gradient7 Prokaryotes that undergo anoxygenic photosynthesis are limited in where they can grow because they A cannot make NADPHB cannot produce O2C require very high light levelsD cannot use HO as an electron donor 2E contain only two photosystemsWhy Dmust use things that are more easily oxidized HS2 this limits there habitats Why not BCommon mistakeThe ability to make O2is not an advantageThere is lots of O2 in the atmosphere an organism can use Student numberCode 111Code 111Code 111Code 111
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