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In the mesophyll cell of a leaf, the synthesis
of ATP occurs in which of the following?
I. Ribosomes
II. Mitochondria
III. Chloroplasts
a. I only
b. II only
c. III only
d. II and III only
Answer: d
e. I, II, and III
Plants are thought to have evolved from
a. Red algae (Rhodophyta)
b. Green algae (Charophyta/Chlorophyta)
c. Blue-green algae (Cyanobacteria)
d. Diatoms (Chrysophyta)
e. Brown algae (Phaeophyta)
Answer: b
Answer: e
This diagram depicts
chemiosmosis in a
chloroplast. What is
occurring at “Q”?
a.Energy is consumed.
b. Water is cleaved.
c. NADP+ is reduced.
d. ADP is phosphorylated
to ATP
e. Electrons are transported
down the electron
transport chain.
A study of the metabolic rate in a terrestrial
community shows that the energy captured
in photosynthesis exceeds the energy released
by respiration. Which of the following
situations is occurring?
a. Community biomass is increasing.
b. Community biomass is decreasing.
c. A climax community has been reached.
d. The first law of thermodynamics is not
in effect.
e. The second law of thermodynamics
is not in effect.
Answer: a
A biologist isolates numerous, tiny, green-pigmented
cells from a sample of lake water. The cells are
covered with a mucilaginous sheath. They contain
relatively large amounts of chlorophyll a and phycobilin
pigments and lack a compact, organized nucleus.
Electron microscopy reveals that these cells also contain
which of the following pairs of subcellular structures?
a. ribosomes and chloroplasts
b. ribosomes and mitochondria
c. golgi bodies and a cell wall
Answer: d
d. thylakoids and a cell wall
e. chloroplasts and mitochondria
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?
a. the splitting of water
b. the absorption of light energy by chlorophyll
c. The flow of electrons from PSII to PSI
d. The synthesis of ATP
Answer: d
e. The reduction of NADP+
The reactions of the Calvin cycle require all of
the following EXCEPT:
a. CO2
b. ATP
c. RuBP
d. glucose
e. NADPH
Answer: d
All the events listed below occur in the
energy-capturing light reactions of
photosynthesis EXCEPT:
a. oxygen is produced
b. NADP+ is reduced to NADPH
c. carbon dioxide is incorporated into PGA
d. ADP is phosphorylated to yield ATP
e. light is absorbed and funneled to a
reaction center chlorophyll a
Answer: c
Which of the following is NOT true of
RuBP carboxylase?
a. It is a protein.
b. It speeds up a chemical reaction.
c. It lowers the energy of activation.
d. It catalyzes a phosphorylation reaction.
e. It has an affinity for both O2 and CO2.
Answer: d
Why is the absorption
spectrum different from
the action spectrum?
a. Green and yellow
wavelengths inhibit the
absorption of red and
blue wavelengths.
b. Bright sunlight destroys photosynthetic pigments.
c. The two lines are probably the result of inaccurate
measurements.
d.Other pigments absorb light in addition to chlorophyll a
e. Anaerobic bacteria probably interfered with light
absorption.
Answer: d
From the action spectrum
we can correctly conclude
that
a. Chlorophyll absorbs more
green light than red light
b. Plants can use all
colors of visible light
for photosynthesis.
c. Every color of light is equally good for photosynthesis.
d. Light in the green range produces the most effective
photosynthesis.
e. There are two independent photosystems in leaves;
one for red light alone and one for blue light alone.
Answer: b
Where does the Calvin cycle of photosynthesis
take place?
a. stroma of the chloroplast
b. thylakoid membrane
c. cytoplasm surrounding the chloroplast
d. chlorophyll molecule
e. outer membrane of chloroplasts
Answer: a
CAM plants keep stomates closed in daytime,
thus reducing loss of water. They can do this
because they can:
a. fix CO2 into organic acids during the night.
b. fix CO2 into sugars in the bundle-sheath cells.
c. fix CO2 into pyruvic acid in the mesophyll cells.
d. use the enzyme phosphofructokinase, which
outcompetes rubisco for CO2.
e. use PS I and PS II at night. Answer: a
In plant cells, ATP is made in response to light.
An electron transport chain is involved. This
electron transport chain is found in the
a. thylakoid membrane of chloroplasts.
b. stroma of chloroplasts.
c. inner membrane of mitochondria.
d. matrix of mitochondria.
e. cytoplasm.
Answer: a
If photosynthesizing green algae are provided
with CO2 synthesized with heavy oxygen (O-18),
later analysis will show that all but one of the
following compounds produced by the algae
contain the O-18 label. That one exception is:
a. PGA
b. PGAL
c. glucose
d. RuBP
Answer: e
e. O2
The process of cyclic photophosphorylation
uses light energy to synthesize:
a. ADP and ATP
b. ATP only
c. ATP and NADPH
d. ADP and NADPH
e. PS I and PSII
Answer: b
The process of noncyclic
photophosphorylation
uses light energy to synthesize:
a. ADP and ATP
b. ATP only
c. ATP and NADPH
d. ADP and NADPH
e. PS I and PSII
Answer: c
In green plants, the primary function of the
Calvin cycle is to:
a. use ATP to release carbon dioxide.
b. use NADPH to release carbon dioxide.
c. split water and release oxygen.
d. transport RuBP out of the cytoplasm.
e. construct simple sugars from carbon
dioxide.
Answer: e
Which of the following statements best represents the
relationships between the light reactions and the
Calvin cycle?
a. The light reactions provide ATP and NADPH to the
Calvin cycle, and the cycle returns ADP, phosphate,
and NADP+ to the light reactions.
b. The light reactions provide ATP and NADPH to the
carbon fixation step of the Calvin cycle, and the cycle
provides water and electrons to the light reactions.
c. The light reactions supply the Calvin cycle with CO2
to produce sugars, and the Calvin cycle supplies the
light reaction with sugars to produce ATP.
d. The light reactions provide the Calvin cycle with oxygen
for electron flow, and the cycle provides the light reactions
with water to split.
Answer:
e. None of the above
a
In the thylakoid membranes, what is the main
function of the antenna pigment molecules?
a. to split water and release oxygen to the
reaction center chlorophyll a
b. to harvest photons and transfer light energy
to the reaction center chlorophyll a
c. to synthesize ATP from ADP and phosphate
d. to pass electrons to ferredoxin and then
NADPH
e. to concentrate photons inside the stroma
Answer: b
In mitochondria, chemiosmosis translocates
protons from the matrix into the intermembrane
space, whereas in chloroplasts, chemiosmosis
translocates protons from:
a. the stroma to the chlorophyll.
b. the matrix to the stroma.
c. the stroma to the thylakoid compartment.
d. the intermediate space to the matrix.
e. the light reactions to the Calvin cycle.
Answer: c
Each photosystem:
a. contains a mix of chlorophylls and carotenoids.
b. has a light gathering antenna complex.
c. has a special chlorophyll a molecule in the
reaction center.
d. All three are correct.
Answer: d
Organisms that exist on compounds produced
by other organisms
a. are called autotrophs.
b. are called photoautotrophs.
c. are called heterotrophs.
d. do not exist in nature.
e. Both a and b are correct.
Answer: c
Answer: c
Molecule “A”
Which of the following is true of molecule “A”?
a. It is classified as a carotenoid.
b. It would move the furthest of all the plant
pigments in chromatography using a nonpolar
solvent such as petroleum ether.
c. It is found embedded in the thylakoid
membrane of the chloroplast.
d. It contains iron.
e. It is required for the contraction of muscles.