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UA BSC 108 Exam 2 Practice Questions and Answers 100% Pass 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-inne...

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UA BSC 108 Exam 2 Practice Questions and
Answers 100% Pass


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.




Copyright ©SOPHIABENNETT 2025 ACADEMIC YEARALL RIGHTS RESERVED. Page 1/11

, 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.


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