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Chap 7 Review Questions(10)
Give the formula for photosynthesis. For each reactant,
indicate where the plant acquires it. For each product, note
during what part of photosynthesis it is produced.
Why is no glucose produced if a plant is kept in the dark,
even though the sugar producing reactions are called lightindependent?
Before photosynthesis evolved, ________ was rare in Earth's
atmosphere.
a. N2
b. CO2
c. O2
d. H2O
e. air
What structural feature of a leaf allows a leaf to obtain CO2
from the air?
a. Stomata
b. Epidermis
c. Cuticle
d. Mesophyll
e. Chloroplast
The vast majority of chloroplasts found in a leaf are located
where?
a. Vascular bundles
b. Cuticle
c. Epidermis
d. Stroma
e. Mesophyll
Specifically, molecules of chlorophyll are located in
membranes of sacs called:
a. Cristae
b. Thylakoids
c. Stroma
d. Grana
e. Vesicles
All of the following compounds are required (i.e. are
necessary constitutents for chemical reactions) at some state
of green plant photosynthesis, EXCEPT
a. ATP
b. NADP
c. water
d. oxygen
e. carbon dioxide
The cellular organelle of eukaryotic organisms which is
responsible for photosynthetic activity is the:
a. Nucleus
b. Mitochondrion
c. Chloroplast
d. Endoplasmic reticulum
e. Ribosome
Energy is passed around different chlorophyll molecules until
it reaches a specific chlorophyll molecule called the:
a. Reaction center
b. Photoelectric point
c. Electron carrier molecule
d. Accessory pigment
e. Nucleus
A pigment that absorbs red and blue light and reflects green
light is:
a. Phycocyanin
b. Carotenoid
c. Xanthophyll
d. Melanin
e. Chlorophyll
Which statement is true regarding the light-dependent
reactions?
a. They rely on energy provided by glucose synthesis.
b. Overall, they are exergonic because ATP is produced.
c. Without water, the system would shut down.
d. ATP and NADPH are needed.
e. Without photosystem I, photosystem II could not occur.
The replacement electrons for the reaction center of
photosystem II come from:
a. Photosystem I
b. H2O
c. Glucose
d. O2
e. NADPH
What is produced in photosystem II's electron transport
system?
a. NADPH
b. ATP
c. glucose
d. O2
e. CO2
Light-dependent photosynthetic reactions produce:
a. ATP, NADPH, O2
b. ATP, NADPH, CO2
c. Glucose, ATP, O2
d. Glucose, ATP, CO2
e. ATP, NADPH, H2O
Where does the O2 released during photosynthesis come from?
a. CO2
b. H2O
c. ATP
d. C6H12O6
e. RuBP
During the process of photosynthesis, solar energy is
converted into:
a. Chemical energy
b. Heat energy
c. Thermal energy
d. Mechanical energy
e. Nuclear energy
The light-dependent reactions of photosynthesis result in
which of the following?
a. Oxidation of CO2
b. Reduction of H2O
c. Phosphorylation of ADP
d. Oxidation of chlorophyll
e. Oxidation of glucose
What is the role of water in photosynthesis?
a. to maintain turgor pressure
b. to provide electrons
c. to provide oxygen
d. to provide H2
e. all of these
Which of the following is a source of electrons used for
reduction reactions by green plants?
a. Glucose
b. CO2
c. RuBP
d. O2
e. H2O
According to the chemiosmotic theory, during ATP synthesis,
hydrogen ions cross the thylakoid membranes from the stroma
by:
a. Osmosis
b. Facilitated diffusion
c. Active transport
d. Simple diffusion
e. Phosphorylation
The energy of the movement of electrons down their
concentration gradient via electron transport within
chloroplasts and mitochondria is used to generate molecules
of:
a. H2O
b. CO2
c. C-H-O
d. ATP
e. O2
During photosynthesis, which chemical activity specifically
results in the synthesis of molecules of ATP?
a. Photosystem II
b. Generation of NADPH
c. Splitting of a water molecule
d. Fixing of carbon
e. Synthesis of O2
The NADPH required for carbon dioxide fixation is formed
a. by the reduction of oxygen.
b. by the hydrolysis of ATP.
c. during the light reactions.
d. only in C4 plants.
e. in the mitochondria.
The primary function of the light reactions of photosynthesis
is
a. to produce energy-rich glucose from carbon dioxide and
water.
b. to produce energy-rich ATP and NADPH.
c. to produce NADPH used in respiration.
d. to convert light energy to the chemical energy of lipids.
e. to use the ATP to make glucose.
In
a.
b.
c.
d.
e.
C3 photosynthesis, what fixes the carbon?
RuBP
PEP
PGA
PGAL
ATP
How many molecules of CO2 are fixed to form 1 molecule of
glucose?
a. 2
b. 3
c. 6
d. 9
e. 12
The term "cycle" is used to describe the light-independent
reactions (Calvin-Bensen cycle) because...
a. the same reactions occur every time.
b. CO2 is fixed in every turn of the cycle.
c. the process begins and ends with RuBP.
d. glucose is synthesized during the process.
e. the process depends on products from the light-dependent
reactions.
Where is glucose synthesized?
a. Thylakoids
b. Cytoplasm
c. Matrix
d. Stroma
e. Intermembrane compartment
Which of the following occurs during the light-independent
reactions of photosynthesis?
a. Water is converted into hydrogen and water.
b. Carbon dioxide is converted into sugars.
c. Chlorophyll acts as an enzyme only in the dark.
d. Nothing occurs, the plant rests in the dark.
e. None of the above.
All of the following are part of the Calvin-Benson cycle
except:
a. Carbon Fixation
b. Synthesis of G3P
c. Generation of ATP
d. Regeneration of RuBP
e. All of the above are part of the cycle.
Which of the following are required for the C3 cycle?
a. CO2
b. RuBP enzyme
c. ATP
d. NADPH
e. All of the above
Which of the following provides O2 as an end product?
a. Light-dependent reaction
b. Light-independent reaction
c. Cellular respiration
d. Glycolysis
e. Phosphorylation
In the C3 cycle, where does the carbon come from to form
glucose?
a. from ATP and NADPH
b. from chlorophyll
c. from atmospheric CO2
d. from enzymes
e. from water
What happens to CO2 when it moves into the stroma?
a. The CO2 gives up its O2.
b. It immediately passes on to the thylakoids.
c. It becomes a carbohydrate.
d. The CO2 becomes a by-product of cellular respiration.
e. It is converted to water.
In the reduction of CO2 during C4 photosynthesis, which of
the following initially combined with CO2?
a. PGA
b. RuBP
c. PGAL
d. NADH
e. PEP
Specifically, how is the energy derived from the breakdown of
glucose initially used by cells?
a. Phosphorylation of ADP
b. Manufacture of proteins
c. To drive photosynthesis
d. Enzyme synthesis
e. To synthesize simple sugars
In
to
a.
b.
c.
d.
e.
green plants, the primary function of the Calvin cycle is
use ATP to release carbon dioxide.
use NADPH to release carbon dioxide.
split water and release oxygen.
transport glucose out of the chloroplast.
construct simple sugars from carbon dioxide.
In C4 photosynthesis, where does the carbon come from to
synthesize glucose?
a. from ATP and NADPH
b. from chlorophyll
c. from enzymes
d. from water
e. from atmospheric CO2
In
a.
b.
c.
d.
e.
C4 photosynthesis, what initially fixes carbon?
RuBP
PEP
PGA
PGAL
ATP
Where does one expect to find the reactions of a C4 pathway
occurring in a plant such as corn?
a. Mesophyll cells
b. Bundle-sheath cells
c. Epidermal cells
d. a and b
e. b and c
What kind of habitat does a C4 pathway plant favor?
a. Hot and dry
b. Cool and moist
c. Totally aquatic
d. Wet and cloudy
e. Cool and dry
Photorespiration is bad for a plant because...
a. O2 is required.
b. CO2 is synthesized.
c. RuBP is degraded.
d. glucose is synthesized.
e. no ATP is produced.
Where does the C4 cycle get its name?
a. Only 4 carbons are used in the cycle
b. It is a 4 step process
c. 4 CO2 molecules are released
d. The first product in the cycle has 4 carbons
e. PEP is a 4-carbon molecule
If C4 photosynthesis prevents photorespiration, why haven't
all plants evolved to use the C4 pathway?
a. All plants will evolve to be C4 in time.
b. C4 produces some toxic byproducts.
c. C4 is not advantageous in all climates.
d. Only some plants use C4 photosynthesis.
e. C4 is only advantageous in high oxygen habitats.
When water supplies are plentiful for the plant
a. the stomata remain open.
b. the stomata will close.
c. O2 uptake will increase.
d. CO2 release will be possible.
e. more water evaporation will occur.
C3 plants are adapted to ________________ conditions, while
C4 plants are adapted to _____________ environmental
conditions.
a. dry; wet
b. wet; dry
c. temperate; cool and rainy
d. high light; low light
e. drought; rainy
List the three major reactants required for photosynthesis to
occur and list a plant adaptation to provide for these
reactants to come together to produce glucose.
Light dependent reactions occur in the ____________________
and light independent reactions occur in the
_________________ of the chloroplast of a typical mesophyll
leaf cell.
The cells in the ________________ layer of the leaf contain
the majority of a leaf's chloroplasts.
In the process of photosynthesis, _________ and __________
are required from the light dependent reactions to completely
reduce carbon dioxide to glucose in the Calvin cycle.
Which component of the Calvin-Benson cycle is recycled and
why is this important for the light-independent reactions?
Photosystem II generates _____________ and Photosystem I
generates ______________, both of which are required by the
light-dependent reactions.
The combination of oxygen with RuPB during the lightindependent reactions,
rather than carbon dioxide, is called
__________.
The carotenoids and other accessory pigments in the
chloroplast help harvest light energy toward the reaction
center chlorophyll molecules.
a. True
b. False
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