In stage 1, the enzyme RuBisCO incorporates carbon dioxide into an organic molecule. In stage 2, the organic molecule is reduced. In stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue. In summary, it takes six turns of the Calvin cycle to fix six carbon atoms from CO
2
.
What happens to carbon in the Calvin cycle?
In the Calvin cycle,
carbon dioxide molecules (CO2) are combined with each other and with the electrons and Hydrogen ions from NADPH to form glucose
(C6H12O6).
How is carbon recycled through photosynthesis?
Through the process of photosynthesis,
carbon dioxide is pulled from the air to produce food made from carbon for plant growth
. Carbon moves from plants to animals. Through food chains, the carbon that is in plants moves to the animals that eat them. Animals that eat other animals get the carbon from their food too.
Is carbon reduced or oxidized in Calvin cycle?
During the light reactions of photosynthesis, water is oxidized, and during the Calvin cycle,
carbon is reduced
.
What compounds are formed from carbon dioxide in the Calvin cycle?
The reactions of the Calvin cycle add carbon (from carbon dioxide in the atmosphere) to
a simple five-carbon molecule called RuBP
. These reactions use chemical energy from NADPH and ATP that were produced in the light reactions. The final product of the Calvin cycle is glucose.
What is recycled from Calvin cycle to make ATP?
In the case of the Calvin Cycle, the input molecules are carbon dioxide, ATP, and NADPH. The output molecules are sugar, ADP, NADP+, and inorganic phosphate (Pi). The recycled molecule is
ribulose bisphosphate (RuBP)
.
What are the products produced in the Calvin cycle?
The products are
ATP and NADPH, and oxygen
. ATP and NADPH supply energy for carbon fixation in the Calvin cycle . Oxygen is released into the atmosphere.
How are the products produced in the light reactions used in the Calvin cycle?
The light reactions supply the Calvin cycle with
CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP
. The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, Pi, and NADP+ to the light reactions.
What is the initial carbon containing starting product in the Calvin cycle?
What is the initial carbon containing starting product in the Calvin cycle? The reactions of the Calvin cycle add carbon (from carbon dioxide in the atmosphere) to
a simple five-carbon molecule called RuBP
. These reactions use chemical energy from NADPH and ATP that were produced in the light reactions.
How is carbon recycled in the growth of new leaves?
Microorganism decompose the lead leaves from the old tress. They break up the leaves and release the nutrient and carbon into the environment. the new leaves photosynthesis and use the Carbon that was broken down in respiration to make glucose which is used to make new cells.
Which process recycles carbon back into the environment?
Decomposers break down the dead organisms and return the carbon in their bodies to the atmosphere as carbon dioxide by
respiration
.
What is the process through which carbon is recycled through living organisms?
Animals and plants need to get rid of carbon dioxide gas through a process called
respiration
. Carbon moves from fossil fuels to the atmosphere when fuels are burned. When humans burn fossil fuels to power factories, power plants, cars and trucks, most of the carbon quickly enters the atmosphere as carbon dioxide gas.
Does the Calvin cycle require carbon dioxide?
The Calvin cycle is a process that plants and algae use to turn carbon dioxide from the air into sugar
, the food autotrophs need to grow.
What gets reduced during the Calvin cycle?
In the carbon fixation phase of the Calvin cycle, inorganic carbon in the form of carbon dioxide becomes incorporated into organic form. Essentially,
carbon dioxide
is reduced to provide a higher energy molecule.
Is carbon dioxide is oxidized during the Calvin cycle?
Atmospheric carbon dioxide is converted to glucose during the Calvin-Benson cycle
. This requires the overall reduction of CO2, using the electrons available from the oxidation of NADPH. Thus the dark reactions represent a redox pathway. NADPH is oxidized to NADP+ and CO2 is reduced to glucose.
What does the Calvin cycle need help from in order to make sugars?
The Calvin cycle has two parts. First carbon dioxide is ”fixed”. Then
ATP and NADPH from the light reactions
provide energy to combine the fixed carbons to make sugar.
Where does the energy come from that drives the Calvin cycle?
The energy used in the Calvin cycle comes from the
ATP and NADPH
that are made in the Light Reactions stage of photosynthesis.
What is the ultimate goal of the Calvin cycle?
3. The light-independent reactions (Calvin cycle) use stored chemical energy from the light-dependent reactions to “fix” CO
2
and create a product that can be converted into glucose. The ultimate goal of the light-independent reactions (or Calvin cycle) is
to assemble a molecule of glucose
.
What is being recycled between the light reaction and the Calvin cycle?
In the Calvin cycle, which takes place in the stroma, the chemical energy derived from the light-dependent reactions drives both the capture of carbon in carbon dioxide molecules and the subsequent assembly of
sugar molecules
. The two reactions use carrier molecules to transport the energy from one to the other.
What is recycled between the light-dependent and light-independent reactions?
The light-independent reactions (Calvin cycle) use stored chemical energy from the light-dependent reactions to “fix”
CO
2
and create a product that can be converted into glucose. The ultimate goal of the light-independent reactions (or Calvin cycle) is to assemble a molecule of glucose.
What molecules are recycled in light-independent reactions?
Six molecules of both
ATP and NADPH
are used in the process. The exergonic process of ATP hydrolysis is in effect driving the endergonic redox reactions, creating ADP and NADP
+
. Both of these “spent” molecules (ADP and NADP
+
) return to the nearby light-dependent reactions to be recycled back into ATP and NADPH.
Why is the Calvin cycle also called carbon fixation?
why is the Calvin cycle also called carbon fixation? This process is called carbon fixation
because CO2 is “fixed” from an inorganic form into organic molecules
.
What happens during carbon fixation?
Carbon fixation is the process by which
inorganic carbon is added to an organic molecule
. Carbon fixation occurs during the light independent reaction of photosynthesis and is the first step in the C3 or Calvin Cycle.
Why does Calvin cycle need products of light?
Because it is needed to convert oxygen into sugar
. Explanation: Although the Calvin Cycle is not light-dependent directly, it is light-Dependent indirectly because the required energy carriers are results of light-dependent processes.
What are the two products in the light-dependent reaction that are needed in Calvin cycle?
The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis:
the energy storage molecule ATP and the reduced electron carrier NADPH
.
