5.3 The Calvin Cycle

The electron travels along a series of genes.

The energy from the electron is pumped into the interior of the thylakoid.
I accept the electron.

The energy absorbed by sunlight is stored in two types of energy-carrier molecule.

The molecule has a single atom that is held in a bond.
It is a hydrogen atom for NADPH.
NADH was a molecule that carried energy from the citric acid cycle to the electron transport chain.
Each molecule loses atoms when it releases energy into the Calvin cycle.

There is a difference in the concentration of protons and the charge across the membrane that causes the formation of an electrochemical gradient.

The potential energy is captured and stored in the chemical energy in ATP through the movement of hydrogen ion down their electrochemical gradient.

The hydrogen ion is allowed to pass through the thylakoid.

The same molecule was generated in the Mitochondrion.
The energy generated by the hydrogen ion stream allows a thirdphosphate to be attached to a secondphosphate in a process called photophosphorylation.
There is a semi-permeable structure that allows hydrogen ion to move from high to low concentration.

The other energy-carrier molecule, NADPH, is the last function of the light-dependent reaction.

The electron from the transport chain arrives at photosystem I and is re-energized by another photon.
The formation of NADPH is driven by the energy from this electron.
The solar energy can be used to make a sugar molecule.

The cell has the fuel to build food after the energy from the sun is converted.

The carbon atoms are in the back of the carbohydrate molecule.
Animals exhale carbon dioxide when they breath, and the carbon atoms used to build the molecule come from it.

In plants, carbon dioxide diffuses into the stroma of the chloroplast, the site of the Calvin cycle reactions where sugar is synthesized.

The scientist who discovered the reactions named them after him.
The name of another scientist involved in the discovery is called the Calvin-Benson cycle.

Light-dependent reactions harness energy from the sun to produce.

The Calvin cycle reactions take place in the stroma.

There are three basic stages of the Calvin cycle reactions.

In the stroma, there are two chemicals that are present to start the Calvin cycle.

There are five atoms of carbon and a group on each end.

A six-carbon compound is formed by a reaction between CO2 and RuBP, which is immediately converted into two three-carbon compounds.

The three-carbon compound, 3-PGA, is converted into another three-carbon compound called G3P.

The reduction reaction involves the gain of electrons.
The gain of an electron by an atom or molecule is called a reduction.
The reduction reaction results in the return of the light- dependent reactions to be re-energized.

One of the G3P molecules leaves the Calvin cycle to contribute to the creation of the carbohydrate molecule.

It takes six turns of the Calvin cycle to make a single carbohydrate molecule because it has six carbon atoms.
The system can prepare for the carbon-fixation step by regenerating the remaining G3P molecule.
It is also used in regeneration.

The Calvin cycle has three stages.

In stage 1, carbon dioxide is incorporated into an organic molecule.
The organic molecule is reduced in stage 2.
The molecule that starts the cycle is regenerated in stage 3.

The Calvin cycle takes six turns to fix six carbon atoms.

The reduction step and regeneration step require energy input from 12 and 6 ATP molecules, respectively.

There is an animation of the Calvin cycle.

Click Stage 1, Stage 2, and Stage 3 if you want to see G3P and ATP regenerating.

The basic process of all organisms has not changed much over time.

Between the giant tropical leaves in the rainforest and tiny cyanobacteria, the process and components of photosynthesis that use water as an electron donor remain largely the same.
Photosystems use electron transport chains to convert energy.

The basic pattern is affected by a variety of conditions.

Plants have adapted to conserve water.
Every drop of water and energy must be used to survive in the heat.

There are two adaptations in these plants.

A more efficient use of CO2 allows plants to photosynthesize even when CO2 is in short supply, as when the stomata are closed on hot days.
The other adaptation performs preliminary reactions of the Calvin cycle at night because it conserves water.
Plants have been able to carry out low levels of photosynthesis without opening the stomata, an extreme mechanism to face extremely dry periods.

The harsh conditions of the desert have led plants like this cactus to evolve different reactions outside the Calvin cycle.

The variations help conserve water and energy.

The light-dependent reactions and the Calvin cycle are part of the photosynthesis.

Prokaryotes, such as cyanobacteria, do not have organelles.
ganisms like cyanobacteria can carry out photosynthesis and have infoldings of the plasma membrane.

The prokaryote has regions in the plasma that are 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609- 888-609-

All of the necessary components are present to carry out photosynthesis, even though they are not contained in an organelle.

Living things are able to access energy.

Carbohydrates are used to store energy in living things.
Carbohydrates are more stable and efficient for chemical energy thanmolecules.
Plants have mitochondria in addition to their chloroplasts, which allow them to harvest the energy that they have stored in carbohydrates.

6O2 + C6 H12 O6 - 6CO2 + 6H2 O Photosynthesis is the reverse of the overall reaction for cellular respiration: 6O2 + C6 H12 O6 - 6CO2 + 6H2 O Photosynthesis.

There is no waste in nature.

Every atom of matter is recycled indefinitely.
Substances change form or move from one molecule to another CO2 is not a waste product of respiration.
There are two reactions that move on to other reactions.
Aerobic cellular respiration releases energy when oxygen is used to break down carbohydrates.
The energy needed to drive other reactions is generated by electron transport chains.
In a biological cycle, photosynthesis and cellular respiration allow organisms to access life-sustaining energy that comes from millions of miles away in a star.

Life on earth was transformed by the process of photosynthesis.

Living things were able to take enormous amounts of energy from the sun.
Because of photosynthesis, living things gained access to sufficient energy, allowing them to evolve new structures and achieve the biodiversity that is evident today.

Only certain organisms, called autotrophs, can perform photosynthesis; they require the presence of chlorophyll, a specialized pigment that can absorb light and convert light energy into chemical energy.

Oxygen is released into the air when carbon dioxide and water are used in photosynthesis.
Plants and algae have cells called chloroplasts that are involved in photosynthesis.

The first part of photosynthesis involves the absorption of energy from the sun.

A photon strikes photosystem II.
The electron transport chain pumps hydrogen ion into the space.
This forms an electric field.
The ion flow from the thylakoid space into the stroma is used for the formation of sugar molecule in the second stage of photosynthesis.

An energy carrier for the Calvin cycle reactions is formed when Photosystem I absorbs a second photon.

The Calvin cycle reactions fix CO2 from the environment by using the energy carriers formed in the first stage of photosynthesis.

The fixation reaction is made possible by the combination of CO2 and RuBP.
The six-carbon compound is broken down into two three-carbon compounds, and the energy in ATP and NADPH is used to convert them into G3P.
One of the three-carbon molecule of G3P leaves the cycle to become a part of a carbohydrate molecule.
The remaining G3P molecule stays in the cycle to be formed back into RuBP, which is ready to react with more CO2.
The process of cellular respiration and photosynthesis form a balanced energy cycle.
Plants are capable of both photosynthesis and cellular respiration.

Plants close their stomata on hot days to conserve water.

Plants produce oxygen.

The photosynthesis of the G3P molecule and the reduction of CO2 b. G3P c.