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UA BSC 108 EXAM 2 2026 UPDATED EXAM
WITH 100% PASS ASSURED SOLUTIONS.
What is a photosynthetic autotroph? - correct
answer- An organism that makes its own food
from inorganic ingredients.
What is the fluid inside chloroplasts called?
- correct answer- Stroma
What are the membranes inside chloroplasts
called? - correct answer- inner and outer
membranes
Write the overall equation for photosynthesis.
- correct answer- 6CO2+6H2O→C6H12O6+6O2
What is the primary function of pigments in
photosynthesis? Name the primary pigment used
in photosynthesis. - correct answer- Pigments
absorb certain wavelengths. They are the means
by which the energy of sunlight is captured
for photosynthesis. The primary pigment used
in photosynthesis is Chlorophylla-a.
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Why are leaves green? - correct answer- 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 energy.
How and where does water enter a plant? -
correct answer- Water enters root hair cells
by osmosis.
How and where does carbon dioxide enter a
plant? - correct answer- Carbon Dioxide
diffuses through small holes in the underside
of leaves, called the stomata.
The light reactions take place in three
stages. Name the stages and summarize the
events of each stage. 1. Photons excite
electrons in the chlorophyll of the first
photosystem. These photons 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
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chloroplast uses the energy released by this
electron "fall" to make ATP. 3. The second
photosystem transfers its light-excited
electrons to NADP+, reducing it to NADPH.
List all products of the light reactions.
carbon dioxide, water. Glucose, oxygen
The Calvin cycle has three main stages. Name
the stages and summarize the events of each
stage. - correct answer- "1) Carbon Fixation-
The enzyme rubisco combines CO2 with 5-carbon
sugar rubulose biphosphate (RuBP). The
unstable product formed splits into 2
molecules 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, producing 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 chemical
reactions uses energy from ATP to rearrange
the atoms of the 5 G3P molecules, (15 total
carbons), which forms 3 RuBP molecules (15
total carbons).
These will start another turn of the cycle.
"
UA BSC 108 EXAM 2 2026 UPDATED EXAM
WITH 100% PASS ASSURED SOLUTIONS.
What is a photosynthetic autotroph? - correct
answer- An organism that makes its own food
from inorganic ingredients.
What is the fluid inside chloroplasts called?
- correct answer- Stroma
What are the membranes inside chloroplasts
called? - correct answer- inner and outer
membranes
Write the overall equation for photosynthesis.
- correct answer- 6CO2+6H2O→C6H12O6+6O2
What is the primary function of pigments in
photosynthesis? Name the primary pigment used
in photosynthesis. - correct answer- Pigments
absorb certain wavelengths. They are the means
by which the energy of sunlight is captured
for photosynthesis. The primary pigment used
in photosynthesis is Chlorophylla-a.
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Why are leaves green? - correct answer- 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 energy.
How and where does water enter a plant? -
correct answer- Water enters root hair cells
by osmosis.
How and where does carbon dioxide enter a
plant? - correct answer- Carbon Dioxide
diffuses through small holes in the underside
of leaves, called the stomata.
The light reactions take place in three
stages. Name the stages and summarize the
events of each stage. 1. Photons excite
electrons in the chlorophyll of the first
photosystem. These photons 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
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chloroplast uses the energy released by this
electron "fall" to make ATP. 3. The second
photosystem transfers its light-excited
electrons to NADP+, reducing it to NADPH.
List all products of the light reactions.
carbon dioxide, water. Glucose, oxygen
The Calvin cycle has three main stages. Name
the stages and summarize the events of each
stage. - correct answer- "1) Carbon Fixation-
The enzyme rubisco combines CO2 with 5-carbon
sugar rubulose biphosphate (RuBP). The
unstable product formed splits into 2
molecules 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, producing 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 chemical
reactions uses energy from ATP to rearrange
the atoms of the 5 G3P molecules, (15 total
carbons), which forms 3 RuBP molecules (15
total carbons).
These will start another turn of the cycle.
"
