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BIOC 385 Final Exam Questions & Detailed Answers

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BIOC 385 Final Exam Questions & Detailed Answers

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  • August 9, 2024
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BIOC 385 Final Exam Questions & Detailed
Answers

The Biosphere 2 project, in Tucson, Arizona, was an experiment involving a large
sealed terrarium with humans and photosynthetic plants living in balance. Why did
the project have to be interrupted after only a few months?



Levels of CO2 rose to dangerous levels.

The humans ran out of food.

The plants stopped producing oxygen.

The rate of photosynthesis was too high - ANS Levels of CO2 rose to dangerous
levels



The __________ is driven directly by photo- ns from the sun in photosynthesis
light reactions.



pumping of protons

synthesis of ATP

transfer of electrons

synthesis of glucose - ANS transfer of electrons



Heme and chlorophyll have similar overall structures. What is common between
the two molecules?

,color

hydrophobic tail

polycyclic planar structure

metal ion found at their center - ANS polycyclic planar structure



Chlorophyll absorbs light energy efficiently because of the



metal ion in the center of the molecule.

ring structure.

planar structure.

alternating double and single bonds. - ANS alternating double and single bonds



Which of the following is a photosynthetic light harvesting pigment?



FeS cluster

NADPH

plastoquinone

β-carotene - ANS β-carotene



Approximately how many light-harvesting chromophores are found per
photosystem enzyme, such as in PSI or PSII?

,2

about a dozen

about 100 to 200

about 1000 to 2000 - ANS about 100 to 200



The following picture is an example of what phenomenon?



resonance energy transfer

electron transfer

photoexcitation

fluorescence - ANS resonance energy transfer



Which of the following is an electron transfer molecule in photosynthesis light
reactions?


plastoquinone

photon

paraquat

ATP - ANS plastoquinone



The photosynthetic Z scheme describes the

, synthesis of glucose from CO2.

movement of electrons driven by the absorption of light energy.

production of O2.

reduction of NADPH. - ANS movement of electrons driven by the absorption of
light energy



The primary difference between ATP synthesis during the photosynthetic light
reactions and ATP synthesis in the mitochondrial electron transport chain is the


cellular location of the proton motive force.

enzyme catalyzing the ATP synthesis.

number of ATP produced per 360 rotation of the F1 subunit of ATP synthase.

number of NADPH required to produce ATP. - ANS cellular location of the proton
motive force



In the chloroplasts, photosystem I (PSI) and photosystem II (PSII) are known to
localize in different regions. PSI generally localizes in the __________, whereas PSII
localizes in the __________.



thylakoid lumen, thylakoid grana

thylakoid lamellae, thylakoid grana

stroma, thylakoid lumen

thylakoid grana, thylakoid lamellae - ANS thylakoid lamellae, thylakoid grana

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