Unit 4 Review
1
A new flower species has a unique photosynthetic pigment. The leaves of this plant appear
to be reddish yellow. What wavelengths of visible light are not being absorbed by this
pigment?
A
B
C
D
E
2
In green plants, most of the ATP for synthesis of proteins, cytoplasmic streaming, and
other cellular activities comes directly from
A
B
C
D
E
3
the Calvin cycle.
oxidative phosphorylation.
cyclic photophosphorylation.
noncyclic photophosphorylation.
noncyclic photophosphorylation.
Chlorophyll pigment molecules can be found in
A
B
C
D
E
4
red and yellow
blue and violet
green and yellow
blue, green, and red
green, blue, and violet
ATP synthase
Photosystem I
Photosystem II
both B and C
both B and C
Below is an absorption spectrum for an unknown pigment molecule. What color would this
pigment appear to you?
A
B
C
D
E
red
blue
green
violet
yellow
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Unit 4 Review
5
When light strikes the reaction center chlorophyll of Photosystem I ("C"), energized
electrons enter an electron transport chain. These electrons are eventually used to ____
producing ____.
A
B
C
D
E
6
Imagine you had a tiny pH probe that could measure the pH inside a living plant cell. What
portion of an illuminated C3 plant cell would you expect to have the lowest pH?
A
B
C
D
E
7
nucleus
chloroplasts
thylakoid spaces
stroma of chloroplasts
stroma of chloroplasts
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 of the light reactions?
A
B
C
D
E
8
reduce H20 ... O2
oxidize H20 ... O2
reduce NADP+ ... NADPH.
oxidize NADP+ ... NADPH.
both A and C
the synthesis of ATP
the splitting of water
the reduction of NADP+
the flow of electrons from photosystem II to photosystem I
the flow of electrons from photosystem II to photosystem I
Which of the following processes could still occur in a chloroplast in the presence of an
inhibitor that prevents H+ from passing through ATP synthase complexes?
A
B
C
D
E
the Calvin cycle
sugar synthesis
oxidation of NADPH
generation of a "proton pressure"
generation of a "proton pressure"
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Unit 4 Review
9
In an experiment studying photosynthesis performed during the day, you provide a plant
with radioactive carbon (14C) dioxide as a metabolic tracer. The 14C is incorporated first
into oxaloacetic acid. The plant is best characterized as a
A
B
C
D
E
10
The diagram below represents an experiment with isolated chloroplasts. The chloroplasts
were first made acidic by soaking them in a solution at pH 4. After the thylakoid space
reached pH 4, the chloroplasts were transferred to a basic solution at pH 8. The
chloroplasts are then placed in the dark. Which of these compounds would you expect to
be produced?
A
B
C
D
E
11
C4 plant.
C3 plant.
CAM plant.
chemoautotroph.
chemoautotroph.
ATP
G3P
NADPH
ATP and NADPH
ATP, NADPH, and G3P
The light reactions of photosynthesis use _____ and produce _____.
A
B
C
D
E
water ... oxygen
NADPH ... NADP+
NADPH ... oxygen
carbon dioxide ... sugar
carbon dioxide ... oxygen
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Unit 4 Review
12
The passing of electrons through the electron transport chain ("B") releases energy that is
used to pump ____ from the ____ into the ____.
A
B
C
D
E
13
In the Calvin cycle, after the 3-carbon molecule 3-PGA is phosphorylated by ATP, it is
reduced by electrons from
A
B
C
D
E
14
CO2.
ATP.
NADP+.
NADPH.
NADPH.
Photosystem II splits ______ into _____, _____, and _____.
A
B
C
D
E
15
water ... stroma ... thylakoid space
NADP+ ... stroma ... thylakoid space
NADPH ... thylakoid space ... stroma
hydrogen ions ... stroma ... thylakoid space
hydrogen ions ... stroma ... thylakoid space
NADPH ... NAD+ ... Pi ... H+
CO2 ... C ... O2 ... 2 electrons
H2O ... H+ ... 2O2 ... 4 electrons
H2O ... 2H+ ... ½O2 ... 2 electrons
2O2 ... 4O+ ... 4 electrons ... H2O
Which pathway represents one possible route that a hydrogen ion might take during
photosynthesis?
A
B
C
D
E
H2O -> NADP+ reductase -> H+ pump -> NADPH
H2O -> photosystem II -> ATP synthase -> stroma
ATP synthase -> thylakoid space -> H+ pump -> stroma
stroma -> H+ pump -> thylakoid space -> ATP synthase -> NADPH
stroma -> H+ pump -> thylakoid space -> ATP synthase -> NADPH
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Unit 4 Review
16
The process of carbon fixation involves the combination of CO2 and RuBP in an
enzyme-catalyzed reaction. The enzyme involved in this reaction is very abundant. It also
has an affinity for O2 that can be considered "evolutionary baggage." What is the name of
this enzyme?
A
B
C
D
E
17
In C3 plants, the closing of stomata promotes the conservation of water. It also promotes
A
B
C
D
E
18
to test for CO2 fixation in the dark.
to test for production of O2 in the light.
to test for production of either sucrose or starch.
to do experiments to generate an action spectrum.
to determine if they have thylakoids in the chloroplasts.
In C4 plants, carbon dioxide is fixed
A
B
C
D
E
20
photosynthesis.
photorespiration.
the light reactions.
the opening of stomata.
a shift to C4 photosynthesis.
Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able
to survive. The best way to detect the lack of photosystem II in these organisms would be
A
B
C
D
E
19
rubisco
ribulase
PEP carboxylase
NADP+ reductase
NADP+ reductase
at night.
only when stomata are closed.
in the cytoplasm of mesophyll cells.
in the chloroplasts of bundle sheath cells.
in the chloroplasts of bundle sheath cells.
CAM plants differ from C3 and C4 plants in that CAM plants
A
B
C
D
E
open their stomata only at night.
are better adapted to wet conditions.
keep their stomata only partially open during the day.
Both A and B
Both A and C
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Unit 4 Review
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Answer Key : Unit 4 Review
Question:
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14
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20
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Answer
A
B
D
B
C
C
A
D
A
A
A
D
D
D
D
A
B
B
C
A