UA BSC 108 Exam 2 LATEST (2025) COMPLETE QUESTIONS With
UA BSC 108 Exam 2
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1. What is a photosynthetic autotroph? An organism that makes its own food from
inorganic ingredients.
2. What is the fluid inside chloroplasts called? Stroma
3. What are the membranes inside chloroplas- inner and outer membranes
ts called?
4. Write the overall equation for photosynthe- 6CO2+6H2O’C6H12O6+6O2
sis.
5. What is the primary function of pigments in Pigments absorb certain wavelengths.
photosynthesis? Name the primary pigment They are the means by which the energy
used in photosynthesis. of sunlight is captured for photosynthesis.
The primary pigment used in photosyn-
thesis is Chlorophylla-a.
6. Why are leaves green? Their green color is from chlorophyll, a
pigment (light- absorbing molecule) in
the chloroplasts that plays a central role in
converting solar energy to chemical ener-
gy.
7. How and where does water enter a plant? Water enters root hair cells by osmosis.
8. How and where does carbon dioxide enter a Carbon Dioxide diffuses through small
plant? holes in the underside of leaves, called the
stomata.
The light reactions take place in three
stages. Name the stages and summa-
rize the events of each stage. 1. Pho-
tons excite electrons in the chlorophyll
of the first photosystem. These photons
, UA BSC 108 Exam 2
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are then trapped by the primary electron
acceptor. This photosystem then replaces
the lost electrons by extracting new ones
from water. This is the step that releases
O2 during photosynthesis. 2. Energized
electrons from the first photosystem pass
down an electron transport chain to the
second photosystem. The chloroplast uses
the energy released by this electron "fall"
to make ATP. 3. The second photosys-
tem transfers its light-excited electrons to
NADP+, reducing it to NADPH.
List all products of the light reactions. car-
bon dioxide, water. Glucose, oxygen
9. The Calvin cycle has three main stages. "1) Carbon Fixation- The enzyme rubis-
Name the stages and summarize the events co combines CO2 with 5-carbon sugar
of each stage. rubulose biphosphate (RuBP). The unsta-
ble product formed splits into 2 mole-
cules of 3-carbon 3-phosphoglyceric acid
(3-PGA).
2) Reduction- Energy from 6 molecules of
ATP is used to oxidize NADPH to NADP+. Six
molecules of 3-PGA are reduced, produc-
ing six molecules of energy-rich 3-carbon
sugar G3P.
3) Release of one molecule of G3P- Five of
the previously created G3Ps remain in the
cycle, but one molecule is released.
4) Regeneration of RuBP - series of chem-
ical reactions uses energy from ATP to re-
arrange the atoms of the 5 G3P molecules,
UA BSC 108 Exam 2
100% Verified Solutions,
Study online at https://quizlet.com/_hd3lep
1. What is a photosynthetic autotroph? An organism that makes its own food from
inorganic ingredients.
2. What is the fluid inside chloroplasts called? Stroma
3. What are the membranes inside chloroplas- inner and outer membranes
ts called?
4. Write the overall equation for photosynthe- 6CO2+6H2O’C6H12O6+6O2
sis.
5. What is the primary function of pigments in Pigments absorb certain wavelengths.
photosynthesis? Name the primary pigment They are the means by which the energy
used in photosynthesis. of sunlight is captured for photosynthesis.
The primary pigment used in photosyn-
thesis is Chlorophylla-a.
6. Why are leaves green? Their green color is from chlorophyll, a
pigment (light- absorbing molecule) in
the chloroplasts that plays a central role in
converting solar energy to chemical ener-
gy.
7. How and where does water enter a plant? Water enters root hair cells by osmosis.
8. How and where does carbon dioxide enter a Carbon Dioxide diffuses through small
plant? holes in the underside of leaves, called the
stomata.
The light reactions take place in three
stages. Name the stages and summa-
rize the events of each stage. 1. Pho-
tons excite electrons in the chlorophyll
of the first photosystem. These photons
, UA BSC 108 Exam 2
Study online at https://quizlet.com/_hd3lep
are then trapped by the primary electron
acceptor. This photosystem then replaces
the lost electrons by extracting new ones
from water. This is the step that releases
O2 during photosynthesis. 2. Energized
electrons from the first photosystem pass
down an electron transport chain to the
second photosystem. The chloroplast uses
the energy released by this electron "fall"
to make ATP. 3. The second photosys-
tem transfers its light-excited electrons to
NADP+, reducing it to NADPH.
List all products of the light reactions. car-
bon dioxide, water. Glucose, oxygen
9. The Calvin cycle has three main stages. "1) Carbon Fixation- The enzyme rubis-
Name the stages and summarize the events co combines CO2 with 5-carbon sugar
of each stage. rubulose biphosphate (RuBP). The unsta-
ble product formed splits into 2 mole-
cules of 3-carbon 3-phosphoglyceric acid
(3-PGA).
2) Reduction- Energy from 6 molecules of
ATP is used to oxidize NADPH to NADP+. Six
molecules of 3-PGA are reduced, produc-
ing six molecules of energy-rich 3-carbon
sugar G3P.
3) Release of one molecule of G3P- Five of
the previously created G3Ps remain in the
cycle, but one molecule is released.
4) Regeneration of RuBP - series of chem-
ical reactions uses energy from ATP to re-
arrange the atoms of the 5 G3P molecules,
