UA BSC 108 Exam 2 Questions And Answers Rated A+ New Update Assured Satisfaction
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UA BSC 108
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UA BSC 108
UA BSC 108 Exam 2 Questions And Answers Rated A+ New
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What is a photosynthetic autotroph? - -An organism that makes its own food from
inorganic ingredients.
What is the fluid inside chloroplasts called? - -Stroma
What are the membranes inside chloroplasts called? - -...
UA BSC 108 Exam 2 Questions And Answers Rated A+ New
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What is a photosynthetic autotroph? - -An organism that makes its own food from
inorganic ingredients.
What is the fluid inside chloroplasts called? - -Stroma
What are the membranes inside chloroplasts called? - -inner and outer membranes
Write the overall equation for photosynthesis. - -6CO2+6H2O→C6H12O6+6O2
What is the primary function of pigments in photosynthesis? Name the primary pigment
used in photosynthesis. - -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? - -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? - -Water enters root hair cells by osmosis.
How and where does carbon dioxide enter a plant? - -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
, UA BSC 108 Exam 2 Questions And Answers Rated A+ New
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The Calvin cycle has three main stages. Name the stages and summarize the events of
each stage. - -"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. - -"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. - -"1) Corn
2) Sugarcane"
What environmental factor is C4 photosynthesis an adaptation for? - -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
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