UA BSC 108 EXAM 2 (TWO VERSIONS) ACTUAL EXAM
WITH VERIFIED QUESTIONS AND CORRECT ANSWERS|
GUARANTEED SUCCESS| ACE YOUR GRADES.
VERSION 1
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.
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 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.
, "
List all products in the Calvin cycle. - Correct 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. - Correct Answer-"1)
Corn
2) Sugarcane"
What environmental factor is C4 photosynthesis an adaptation for? - Correct
Answer-High levels of CO2 and drought environments
Contrast carbon fixation in C4 and CAM plants. C4 plants initially attach CO2toPEP
to form the four-carbon compound OAA using the enzyme PEP carboxylase. This
takes place in the loosely packed cells called mesophyll cells. OAA is then pumped
to another set of cells, the bundle sheath cells, which surround the leaf vein.
WITH VERIFIED QUESTIONS AND CORRECT ANSWERS|
GUARANTEED SUCCESS| ACE YOUR GRADES.
VERSION 1
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.
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 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.
, "
List all products in the Calvin cycle. - Correct 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. - Correct Answer-"1)
Corn
2) Sugarcane"
What environmental factor is C4 photosynthesis an adaptation for? - Correct
Answer-High levels of CO2 and drought environments
Contrast carbon fixation in C4 and CAM plants. C4 plants initially attach CO2toPEP
to form the four-carbon compound OAA using the enzyme PEP carboxylase. This
takes place in the loosely packed cells called mesophyll cells. OAA is then pumped
to another set of cells, the bundle sheath cells, which surround the leaf vein.
