BS 161 Exam 2 Study Questions with
Elaborate Answers (Guarantee Pass)
1. Which products of the light reactions of photosynthesis that are utilized in
the Calvin cycle? -ANSWER ATP and NADPH
2. Functions of Photosystem II only -ANSWER - Oxidation of water
- Reduction of electron transport chain between two photosystems
3. Functions of Photosystem I only -ANSWER - Reduction of NADP+
- Oxidation of electron transport chain between two photosystems
4. Function of both Photosystems -ANSWER - Reduction of primary electron
acceptor
- Light absortion
5. Sunlight provides energy for _________ -ANSWER Photosynthesis
6. What is Photosynthesis? -ANSWER The conversion of light energy to
chemical energy that is stored in glucose or other organic compounds
- Occurs in plants, algae, and certain prokaryotes.
7. Photosynthesis occurs in __________ -ANSWER Chloroplasts
8. Chloroplasts contain the pigment ______ -ANSWER Chlorophyll
,9. Photosynthesis Reactants -ANSWER Light energy + CO2 + H2O
10.Photosynthesis Products -ANSWER Sugars + O2 + H2O
11.Net Reaction of Photosynthesis -ANSWER 6CO2 + 6 H2O + Light Energy -
-> C6H12O6 + 6O2
12.The products of photosynthesis, oxygen and sugar, are used as inputs for
what process? -ANSWER Cellular Respiration in the mitochondria
13.The product of cellular respiration, CO2 (ATP and water used elsewhere),
provides the carbon necessary for which process? -ANSWER
Photosynthesis
14.Where does the Calvin Cycle occur? -ANSWER In the stroma of the
chloroplast
15.Redox Reaction in Photosynthesis -ANSWER - The water is oxidized (loses
electrons)
- The CO2 is reduced (gains electrons)
- Photosynthesis uses light energy to drive the electrons from water to
their more energetic states in the sugar products, thus converting solar
energy to chemical energy.
16.The light reactions of photosynthesis use _____ and produce _____. -
ANSWER Water ... NADPH
,17.Calvin Cycle -ANSWER Energy from ATP, electrons from NADPH, and
carbon from carbon dioxide are combined to produce sugar molecules.
18.In which steps of photosynthetic electron flow from water to NADP+ is
energy input required -ANSWER - P680 --> Pq (plastoquinone)
- P700 --> Fd (ferredoxin)
19.In which steps of photosynthetic electron flow from water to NADP+ is
energy input NOT required -ANSWER - Water --> P680+
- Pq --> P700+
- Fd --> NADP+
20.Autotrophs -ANSWER Self-feeders; plants, bacteria, etc.
21.Heterotrophs -ANSWER Eat others in order to obtain nutrients; animals,
humans, etc.
22.Thylakoid -ANSWER A flattened membrane sac inside the chloroplast, used
to convert light energy to chemical energy.
- Photosystems I and II, ATP Synthase, and Electron Transport Chain
are contained here
23.______ phosphoroylates ADP -ANSWER ATP Synthase
24._____ releases energy that is used to pump hydrogen ions from the stroma
into the thylakoid compartment. -ANSWER Electron Transport Chain; The
energy released as electrons are passed along the electron transport chain is
used to pump protons into the thylakoid compartment.
, 25._____ splits water into 1/2 O2, H+, and e- . -ANSWER Photosystem II
26.Energized electrons from ____ enter an electron transport chain and are then
used to reduce NADP+. -ANSWER Photosystem I
27.Chlorophyll can be found in _____. -ANSWER The Photosystems
28.Why are the absorption spectrum for chlorophyll a and the action spectrum
for photosynthesis different? -ANSWER Other pigments absorb light
besides chlorophyll a
29.In the thylakoid membranes, what is the main role of the antenna pigment
molecules? -ANSWER To harvest photons and transfer light energy to the
reaction-center chlorophyll
30.Metaphase -ANSWER Kinetochores are motionless in relation to poles of
cell
31.Anaphase -ANSWER - Kinetochores move towards poles of cell
- Cohesins break down
32.Telophase -ANSWER Spindle microtubules diassemble
33.During prophase, the microtubules of the mitotic spindle __________ -
ANSWER Lengthen
Elaborate Answers (Guarantee Pass)
1. Which products of the light reactions of photosynthesis that are utilized in
the Calvin cycle? -ANSWER ATP and NADPH
2. Functions of Photosystem II only -ANSWER - Oxidation of water
- Reduction of electron transport chain between two photosystems
3. Functions of Photosystem I only -ANSWER - Reduction of NADP+
- Oxidation of electron transport chain between two photosystems
4. Function of both Photosystems -ANSWER - Reduction of primary electron
acceptor
- Light absortion
5. Sunlight provides energy for _________ -ANSWER Photosynthesis
6. What is Photosynthesis? -ANSWER The conversion of light energy to
chemical energy that is stored in glucose or other organic compounds
- Occurs in plants, algae, and certain prokaryotes.
7. Photosynthesis occurs in __________ -ANSWER Chloroplasts
8. Chloroplasts contain the pigment ______ -ANSWER Chlorophyll
,9. Photosynthesis Reactants -ANSWER Light energy + CO2 + H2O
10.Photosynthesis Products -ANSWER Sugars + O2 + H2O
11.Net Reaction of Photosynthesis -ANSWER 6CO2 + 6 H2O + Light Energy -
-> C6H12O6 + 6O2
12.The products of photosynthesis, oxygen and sugar, are used as inputs for
what process? -ANSWER Cellular Respiration in the mitochondria
13.The product of cellular respiration, CO2 (ATP and water used elsewhere),
provides the carbon necessary for which process? -ANSWER
Photosynthesis
14.Where does the Calvin Cycle occur? -ANSWER In the stroma of the
chloroplast
15.Redox Reaction in Photosynthesis -ANSWER - The water is oxidized (loses
electrons)
- The CO2 is reduced (gains electrons)
- Photosynthesis uses light energy to drive the electrons from water to
their more energetic states in the sugar products, thus converting solar
energy to chemical energy.
16.The light reactions of photosynthesis use _____ and produce _____. -
ANSWER Water ... NADPH
,17.Calvin Cycle -ANSWER Energy from ATP, electrons from NADPH, and
carbon from carbon dioxide are combined to produce sugar molecules.
18.In which steps of photosynthetic electron flow from water to NADP+ is
energy input required -ANSWER - P680 --> Pq (plastoquinone)
- P700 --> Fd (ferredoxin)
19.In which steps of photosynthetic electron flow from water to NADP+ is
energy input NOT required -ANSWER - Water --> P680+
- Pq --> P700+
- Fd --> NADP+
20.Autotrophs -ANSWER Self-feeders; plants, bacteria, etc.
21.Heterotrophs -ANSWER Eat others in order to obtain nutrients; animals,
humans, etc.
22.Thylakoid -ANSWER A flattened membrane sac inside the chloroplast, used
to convert light energy to chemical energy.
- Photosystems I and II, ATP Synthase, and Electron Transport Chain
are contained here
23.______ phosphoroylates ADP -ANSWER ATP Synthase
24._____ releases energy that is used to pump hydrogen ions from the stroma
into the thylakoid compartment. -ANSWER Electron Transport Chain; The
energy released as electrons are passed along the electron transport chain is
used to pump protons into the thylakoid compartment.
, 25._____ splits water into 1/2 O2, H+, and e- . -ANSWER Photosystem II
26.Energized electrons from ____ enter an electron transport chain and are then
used to reduce NADP+. -ANSWER Photosystem I
27.Chlorophyll can be found in _____. -ANSWER The Photosystems
28.Why are the absorption spectrum for chlorophyll a and the action spectrum
for photosynthesis different? -ANSWER Other pigments absorb light
besides chlorophyll a
29.In the thylakoid membranes, what is the main role of the antenna pigment
molecules? -ANSWER To harvest photons and transfer light energy to the
reaction-center chlorophyll
30.Metaphase -ANSWER Kinetochores are motionless in relation to poles of
cell
31.Anaphase -ANSWER - Kinetochores move towards poles of cell
- Cohesins break down
32.Telophase -ANSWER Spindle microtubules diassemble
33.During prophase, the microtubules of the mitotic spindle __________ -
ANSWER Lengthen
