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Topic Five - On the Wild Side
Photosynthesis
Light-Independent Reaction
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Created by
Isaac Barden
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Cards (24)
What is the light-independent reaction of photosynthesis called?
Calvin cycle
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Where does the Calvin cycle take place?
In the
stroma
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What type of energy is not required for the Calvin cycle?
Light energy
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What is the role of photosynthetic enzymes in the Calvin cycle?
They
facilitate
the
reactions
of the cycle
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What is the 5C compound involved in the Calvin cycle?
Ribulose Bisphosphate (
RuBP
)
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What does RuBP combine with during carbon fixation?
Carbon dioxide (
CO2
)
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What enzyme catalyzes the reaction of RuBP and CO2?
Ribulose Bisphosphate Carboxylase (
RUBISCO
)
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What happens to the 6C compound produced in carbon fixation?
It breaks down into 2
3C
compounds
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What are the 3C compounds formed from the breakdown of the 6C compound?
Glycerate-3-phosphate
(GP)
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What is the next step after forming GP in the Calvin cycle?
GP is reduced to
GALP
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What provides the hydrogen for the reduction of GP to GALP?
Reduced
NADP
from the LDR
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What type of reaction occurs when GP is reduced to GALP?
Endothermic
reaction
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What is required to supply energy for the reduction of GP?
ATP
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What happens to one carbon atom from the GALP molecules?
It
is
removed
from
the
cycle
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What is the end product formed from the removal of carbon atoms from GALP?
Glucose
(hexose sugar)
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What happens to the remaining 5C atoms in the Calvin cycle?
They resynthesize
RuBP
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What process is required to resynthesize RuBP?
Phosphorylation
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How many times must the Calvin cycle complete to produce one glucose molecule?
Six
times
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How many CO2 molecules are required to produce one glucose molecule?
Six
CO2 molecules
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How many reduced NADP and ATP are needed for one glucose molecule?
12
reduced NADP and 12 ATP
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How many cycles of the light-dependent reactions (LDR) are required for one glucose molecule?
Six
cycles
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What is produced as a byproduct of the Calvin cycle?
Oxygen (O2)
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Why is glucose stored as starch in starch grains?
Starch has a lower
osmotic
impact
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What is the advantage of starch being more compact?
It results in greater storage
capacity
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