BIO 1108 EXAM QUESTIONS AND
ANSWERS A+ GRADED
In which lettered location in the figure would you find carbohydrate synthesis
taking place?
a. M - lumen
b. J - outer membrane
c. L - thylakoid membrane
d. K - inner membrane
e. N - stroma
e. N - stroma
Which of the sequences best represents the flow of energy through living
systems?
a. H2O → photosynthesis → carbohydrate → cellular respiration → ATP → H2O
b. H2O → photosynthesis → carbohydrate → cellular respiration → ATP → CO2
c. CO2 → photosynthesis → carbohydrate → cellular respiration → ATP → heat
d. light → photosynthesis → carbohydrate → cellular respiration →ATP → heat
e. light → photosynthesis → carbohydrate → cellular respiration → ATP → H2O
d. light → photosynthesis → carbohydrate → cellular respiration →ATP → heat
How many CO2 molecules must enter the Calvin cycle for each molecule of triose
phosphate exported from the chloroplast?
a. 12
b. 1
c. 5
d. 6
e. 3
e. 3
The figure shown illustrates a part of the Calvin-Benson experiments that led to
our understanding of the Calvin cycle. What is happening here?
a. They are extracting the chlorophyll and accessory pigments in hot alcohol.
b. They are filtering the cells into a solution of H218O so that they can trace the
heavy isotope of oxygen as it is incorporated into the cell mass.
c. They are dripping photosynthetic cells into hot alcohol to quickly stop the
reactions of photosynthesis.
d. They are testing whether artificial light from a candle can replace sunlight in
photosynthesis.
c. They are dripping photosynthetic cells into hot alcohol to quickly stop the reactions of
photosynthesis.
, If the photosystem shown is photosystem II, what will happen to the excited
electron from the part labeled 2?
a. It will normally return to a ground state with release of heat.
b. It will oxidize an electron acceptor.
c. It will be passed to an electron acceptor.
d. It will be transferred to H2O.
e. It will reduce an antenna chlorophyll molecule.
c. It will be passed to an electron acceptor.
Which of the answer choices is an advantage of having two slightly different
photosystems in the chloroplasts?
a. Cells are able to use both blue and green wavelengths of light for
photosynthesis.
b. Cells are able to use light energy at twice the maximum efficiency predicted for
cells with a single photosystem.
c. The electrons can be elevated to a higher energy level than is possible with a
single photosystem.
d. The excited electrons provided by photosystem I are at an energy level that is
sufficient to reduce NADP+ to NADPH. A single photosystem would not provide
enough to boost electrons all the way from H2O to NADPH.
e. Twice as many electrons can be excited by a given amount of light energy.
c. The electrons can be elevated to a higher energy level than is possible with a single
photosystem
Approximately what percentage of the sun's usable energy, arriving at the surface
of a leaf, does the photosynthetic electron transport chain capture?
a. 60%
b. 24%
c. 40%
d. 8%
e. 2%
b. 24%
In the lab, you isolate a chlorella mutant that is unable to switch xanthophyll
pigments into the inactive, non-heat-dissipating form. If you released that mutant
into a small pond shaded by trees, would the mutation spread, and why?
a. No, because mutations never spread in nature.
b. Yes, because the xanthophylls prevent the production of reactive oxygen
species.
c. Yes, because the heat released by the xanthophylls would warm up the cells
and enhance photosynthesis.
d. No, because the xanthophylls prevent the production of reactive oxygen
species.
e. No, because xanthophyll dissipates absorbed light as heat, and in low light
environments, such dissipation would decrease photosynthesis and therefore
growth.
e. No, because xanthophyll dissipates absorbed light as heat, and in low light
environments, such dissipation would decrease photosynthesis and therefore growth.
ANSWERS A+ GRADED
In which lettered location in the figure would you find carbohydrate synthesis
taking place?
a. M - lumen
b. J - outer membrane
c. L - thylakoid membrane
d. K - inner membrane
e. N - stroma
e. N - stroma
Which of the sequences best represents the flow of energy through living
systems?
a. H2O → photosynthesis → carbohydrate → cellular respiration → ATP → H2O
b. H2O → photosynthesis → carbohydrate → cellular respiration → ATP → CO2
c. CO2 → photosynthesis → carbohydrate → cellular respiration → ATP → heat
d. light → photosynthesis → carbohydrate → cellular respiration →ATP → heat
e. light → photosynthesis → carbohydrate → cellular respiration → ATP → H2O
d. light → photosynthesis → carbohydrate → cellular respiration →ATP → heat
How many CO2 molecules must enter the Calvin cycle for each molecule of triose
phosphate exported from the chloroplast?
a. 12
b. 1
c. 5
d. 6
e. 3
e. 3
The figure shown illustrates a part of the Calvin-Benson experiments that led to
our understanding of the Calvin cycle. What is happening here?
a. They are extracting the chlorophyll and accessory pigments in hot alcohol.
b. They are filtering the cells into a solution of H218O so that they can trace the
heavy isotope of oxygen as it is incorporated into the cell mass.
c. They are dripping photosynthetic cells into hot alcohol to quickly stop the
reactions of photosynthesis.
d. They are testing whether artificial light from a candle can replace sunlight in
photosynthesis.
c. They are dripping photosynthetic cells into hot alcohol to quickly stop the reactions of
photosynthesis.
, If the photosystem shown is photosystem II, what will happen to the excited
electron from the part labeled 2?
a. It will normally return to a ground state with release of heat.
b. It will oxidize an electron acceptor.
c. It will be passed to an electron acceptor.
d. It will be transferred to H2O.
e. It will reduce an antenna chlorophyll molecule.
c. It will be passed to an electron acceptor.
Which of the answer choices is an advantage of having two slightly different
photosystems in the chloroplasts?
a. Cells are able to use both blue and green wavelengths of light for
photosynthesis.
b. Cells are able to use light energy at twice the maximum efficiency predicted for
cells with a single photosystem.
c. The electrons can be elevated to a higher energy level than is possible with a
single photosystem.
d. The excited electrons provided by photosystem I are at an energy level that is
sufficient to reduce NADP+ to NADPH. A single photosystem would not provide
enough to boost electrons all the way from H2O to NADPH.
e. Twice as many electrons can be excited by a given amount of light energy.
c. The electrons can be elevated to a higher energy level than is possible with a single
photosystem
Approximately what percentage of the sun's usable energy, arriving at the surface
of a leaf, does the photosynthetic electron transport chain capture?
a. 60%
b. 24%
c. 40%
d. 8%
e. 2%
b. 24%
In the lab, you isolate a chlorella mutant that is unable to switch xanthophyll
pigments into the inactive, non-heat-dissipating form. If you released that mutant
into a small pond shaded by trees, would the mutation spread, and why?
a. No, because mutations never spread in nature.
b. Yes, because the xanthophylls prevent the production of reactive oxygen
species.
c. Yes, because the heat released by the xanthophylls would warm up the cells
and enhance photosynthesis.
d. No, because the xanthophylls prevent the production of reactive oxygen
species.
e. No, because xanthophyll dissipates absorbed light as heat, and in low light
environments, such dissipation would decrease photosynthesis and therefore
growth.
e. No, because xanthophyll dissipates absorbed light as heat, and in low light
environments, such dissipation would decrease photosynthesis and therefore growth.
