UA BSC 108 Exam 2 55 REAL EXAM QUESTIONS WITH 100%
RATED CORRECT ANSWERS (ACCURATELY PASSED) 2025
LATEST UPDATED GET A+
What is a photosynthetic autotroph? - (ANSWER)An organism that makes its own food from
inorganic ingredients.
What is the fluid inside chloroplasts called? - (ANSWER)Stroma
What are the membranes inside chloroplasts called? - (ANSWER)inner and outer membranes
Write the overall equation for photosynthesis. - (ANSWER)6CO2+6H2O→C6H12O6+6O2
What is the primary function of pigments in photosynthesis? Name the primary pigment used in
photosynthesis. - (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.
Why are leaves green? - (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? - (ANSWER)Water enters root hair cells by osmosis.
How and where does carbon dioxide enter a plant? - (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 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.
- (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.
"
List all products in the Calvin cycle. - (ANSWER)"6 Turns of the Calvin Cycle→ 1 C₆H₁₂O₆
6CO₂ → 1 C₆H₁₂O₆
18 ATP + 12 NADPH → 1 C₆H₁₂O₆
Left over ATP is used elsewhere by the cell. "
Give two examples of plants that use C4 photosynthesis. - (ANSWER)"1) Corn
2) Sugarcane"
What environmental factor is C4 photosynthesis an adaptation for? - (ANSWER)High levels of
CO2 and drought environments
RATED CORRECT ANSWERS (ACCURATELY PASSED) 2025
LATEST UPDATED GET A+
What is a photosynthetic autotroph? - (ANSWER)An organism that makes its own food from
inorganic ingredients.
What is the fluid inside chloroplasts called? - (ANSWER)Stroma
What are the membranes inside chloroplasts called? - (ANSWER)inner and outer membranes
Write the overall equation for photosynthesis. - (ANSWER)6CO2+6H2O→C6H12O6+6O2
What is the primary function of pigments in photosynthesis? Name the primary pigment used in
photosynthesis. - (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.
Why are leaves green? - (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? - (ANSWER)Water enters root hair cells by osmosis.
How and where does carbon dioxide enter a plant? - (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 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.
- (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.
"
List all products in the Calvin cycle. - (ANSWER)"6 Turns of the Calvin Cycle→ 1 C₆H₁₂O₆
6CO₂ → 1 C₆H₁₂O₆
18 ATP + 12 NADPH → 1 C₆H₁₂O₆
Left over ATP is used elsewhere by the cell. "
Give two examples of plants that use C4 photosynthesis. - (ANSWER)"1) Corn
2) Sugarcane"
What environmental factor is C4 photosynthesis an adaptation for? - (ANSWER)High levels of
CO2 and drought environments
