Lecture 11 Basics: Photosynthesis
Electron Energy and Respiration Overview
Chloroplasts
Photosynthesis overview
Light Reactions
Overview:
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The Photosystem:
H+ and NADPH
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ATP
Products:
Chemiosmosis in Photosynthesis and Cellular Respiration
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Calvin cycle
Overview:
3 stages of the cycle:
Fixation is:
Reduction is:
Regeneration is:
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Summary of electron energy
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Class Notes
While you wait for class to begin:
Fill in the following in this cartoon chloroplast (without looking at your basics notes):
1. What is made in the “thylakoid?”
2. Use them to make sugar in the “stroma.”
3. Indicate where light, water, oxygen, carbon dioxide and H+ are used.
chloroplast
Plant cell
An apple consists of mostly water and carbohydrates. Where does carbon in the carbohydrates
come from?
A. Molecules in the water
B. Molecules in the air
C. Molecules in the soil
D. Fertilizer in the soil
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Radish seeds were placed in these environments. Rank them from highest mass to lowest
mass.
Explain what is occurring in dish 2 and dish 3 in regards to photosynthesis, cellular
respiration, and where the nutrients for plant growth come from.
Dish 2
Dish 3
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Plants and animals in enclosed environments.
In 1772, Joseph Priestly conducted the following experiments, sealing three things inside
glass jars:
A mouse alone
a mouse and a plant
a plant alone
What happened in each case? Why?
Old Exam Questions
Plants need products from the light reactions to fix carbon and make organic molecules during
the Calvin cycle. These products are:
A. Made by splitting of oxygen
B. Captured by chlorophyll
C. Made by reducing water
D. ATP and NADPH
Tomato plants in my closet were growing nicely when a power outage caused the grow lights
to go off for 3 days. Which of the following processes allowed the plants to continue to
generate ATP in the absence of light?
A. Lactic acid fermentation
B. Light reactions
C. Cellular respiration
D. Calvin cycle
E. Dark reactions
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Scientists discovered a plant with a mutant channel in the thylakoids that allowed H+ ions to
leak across the thylakoid membrane down their concentration gradient. As a result of this
mutation:
a. sugar production was reduced
b. more NADPH was formed
c. the pH inside the thylakoid was lower than normal plants
d. electron transport was inhibited
e. ATP synthesis increased to compensate
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