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BS 161 Exam 3 Exam Prep Questions And Answers ()
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BS 161 Exam 3 Exam Prep Questions And Answers (202472025)Which of the following sequences CORRECTLY represents the flow of energy through living
systems? - ✔✔light → photosynthesis → carbohydrate → cellular respiration → ATP → heat
Where is the photosynthetic electron transport chain located in plant cells? - ✔✔in the thylakoid
membranes of the chloroplast
In a thylakoid membrane, absorbed light energy is passed from one chlorophyll molecule to
another until it is: - ✔✔passed to a reaction center.
During photosynthesis, _____ is reduced to _____. - ✔✔carbon dioxide; sugar
Which of the following CORRECTLY lists the three steps of the Calvin cycle? -
✔✔carboxylation, reduction, and regeneration
Which of the following CORRECTLY describes the role of rubisco in the Calvin cycle? -
✔✔Rubisco incorporates CO2 from the atmosphere into an organic molecule.
How many CO2 molecules must enter the Calvin cycle for each molecule of triose phosphate
that can be exported from the chloroplast? - ✔✔3
In the Calvin cycle, NADPH is: - ✔✔oxidized.
Which step of the Calvin cycle would be affected first by a lack of NADPH? - ✔✔reduction
Which of the following are products of the light-dependent reactions of photosynthesis that are
required by reactions in the Calvin cycle? - ✔✔ATP and NADPH
Which of the following are produced directly as a result of the movement of electrons through
the photosynthetic electron transport chain? - ✔✔ATP and NADPH
, During photosynthesis in plants and algae, _____ is being oxidized and _____ is being reduced. -
✔✔H2O; CO2
In plants and algae, _____ is the source of the electrons needed for photosynthesis. - ✔✔H2O
In plants and algae, which of the following is a by-product of photosynthesis? - ✔✔O2
Which one of the following is NOT a product when photosystem II oxidizes a molecule of
water? - ✔✔carbon dioxide
Which of the following CORRECTLY lists the path taken by electrons through the light
dependent reactions of photosynthesis? - ✔✔water → photosystem II → cytochrome b6f →
photosystem I → NADPH
Why is the photosynthetic electron transport chain sometimes referred to as the "Z scheme"? -
✔✔Because the energy level of the electrons increases and decreases and increases and
decreases.
As electrons flow through the light-dependent reactions, they become associated with several
molecules and molecular complexes. When do the electrons have the GREATEST amount of
energy? - ✔✔when they are associated with photosystem I
As electrons flow from one photosystem to another, the amount of energy present in the
electrons decreases. How does the plant cell use the energy lost by the electrons? - ✔✔The
energy is used to create and maintain a proton gradient.
In the chloroplast, cytochrome b6f is an important complex in the photosynthetic electron
transport chain because it accepts electrons from photosystem II and donates them to
photosystem I. Another vital function of cytochrome b6f is that, during its reduction-oxidation
cycle, it moves _____ from the _____. - ✔✔protons; stroma into the thylakoid lumen
Which of the following statements must be true in order for ATP synthase present in chloroplasts
to function properly? - ✔✔The pH of the stroma must be higher than the pH of the thylakoid
lumen.
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