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Which reaction of photosynthesis requires water as a reactant

Now we need to understand how cells can use the products ofphotosynthesis to obtain energy.

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as photosynthesis requires light as a reactant

Most other organisms need O2 and produce CO2 (as a byproduct of respiration)
Photosynthesis: Who's doing it?
Green Algae
Flowering plants = angiosperms

Conifers = gymnosperms
Bryophytes (mosses, liverworts, and hornworts)
Purple photosynthetic bacteria
Asian hornet???
back to the question...
but, why do you eat?
Energy and matter transformation
within biological systems
Living things need energy for growth, reproduction, movement, response(s) to stimulii, homestasis, etc.

This energy comes from the chemical energy stored in the high energy carbon-carbon bonds of organic molecules, such as: glucose, cellulose, and lignin

Photosynthesis the process that captures light energy from the sun and converts it into chemical energy stored in plant sugars such as glucose
Once energy is stored in chemical bonds, organisms can "combust" this energy by oxidizing organic molecules (such as glucose) and generating ATP.

Ultimately, cellular respiration uses the energy stored in the chemical bonds of sugars, amino acids, and fatty acids, to generate ATP.

2Musical Lecture (non-cyclic electron flow)Photosynthesis: Light Reactions pt.

Immediatelyafter exposure to 14CO2, the plant's photosynthetic tissue iskilled by immersing it in boiling alcohol, and all of the biochemical reactions cease.

Light-dependent reactions of photosynthesis - BioTopics

steps of photosynthesis.
Provide the equation for photosynthesis. Explain where each reactant comes from and how the plant gets it. Then, explain the
importance of each product for life on earth.
What is an absorption spectra? Explain why a green leaf looks green. Is it the same reason a red leaf looks red? Explain your
What is the main energy-carrying molecule in the process of photosynthesis? How does it carry energy? Where does it carry
Provide the reactants and products of the light reactions. Describe how the light reactions work. Use a diagram or picture.
Provide the reactants and products of the Calvin cycle. Describe the three phases of these reactions. Use a diagram or
Provide the equation for photosynthesis again. For each reactant, explain how it is used within the light reactions or Calvin
cycle. For each product, describe how it is generated by either the light reactions or by the Calvin cycle.

Nature has appeared to evolve a single gene for the part of PSII that binds an inorganic cluster involved in oxygen formation. The cluster is called the Oxygen Evolving Complex (OEC) and is bound to a central protein in PS2. The cluster, Mn4CaO5, appears identical in all photosynthetic organisms, and is shown below. Researchers were surprise to find that the Ca ion was an integral part of the basic geometric “framework” of the OEC instead of a Mn which was found to be “dangling” from the basic geometric framework.

"Photosynthesis, the Light Reactions, part 3: Making O2 and …

This separation of cellular functions isnecessary because cyanobacteria have oxygen-evolving photosynthesis but the nitrogen-fixing enzyme, nitrogenase, is unstable inthe presence of oxygen.

In respiration energy is released fromsugars when electrons associated with hydrogen are transported to oxygen (theelectron acceptor), and water is formed as a byproduct. The mitochondriause the energy released in this oxidation in order to synthesize ATP. Inphotosynthesis, the electron flow is reversed, the water is split (not formed),and the electrons are transferred from the water to CO2 and in theprocess the energy is used to reduce the CO2 into sugar. Inrespiration the energy yield is 686 kcal per mole of glucose oxidized to CO2,while photosynthesis requires 686 kcal of energy to boost the electrons from thewater to their high-energy perches in the reduced sugar -- light provides thisenergy.

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  • Light-dependent reaction of photosynthesis at the thylakoid membrane

    Carbon dioxide, a key reactant in photosynthesis, is present in the atmosphere at a concentration of about 400 ppm

  • The light reaction of photosynthesis in green plants is shown below

    The light reaction of photosynthesis requires water as a reactant (photosystem 2, chlorophyll a)

  • What are reactants and products of respiration? | …

    3 Answers - What happens in photosynthesis during the light reactions…

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What is the formula for cellular respiration and photosynthesis

The importance of photosynthesis is that it gives out oxygen
reactant in photosynthesis
Carbon dioxide and water are to reactant and glucose and oxygen are the end of the product.

photosynthesis Study Sets and Flashcards | Quizlet

Sunlight is the energy source for an endothermic reaction.
A Recipe
06.03 Photosynthesis and Primary Production Assignment
Thank you!
For example if we are going to do cake we are going to need to get all the ingredients so we could start baking when we start mixing the ingredients the cake is almost ready to be baked.

LabBench Activity Plant Pigments and Photosynthesis

Photosynthetic bacteria and plant have an abundance of molecules that interact with visible light. The main one found in PS2 is chlorophyll a whose structure is shown below.

photosynthesis notes - Biology Junction

"primary producers"), along with nearly every other organism on earth for all of your energy needs
The only exception(s) are chemoautotrophs that live in very harsh environments
The really fascinating part is that photosynthetic organisms require CO2 and produce O2.

Carbon Cycle and the Earth's Climate - Columbia University

Plants growing in drier conditions tend to have small numbers of tiny stomata and only on their lower leaf surface, to save water loss. Most plants regulate the size of stomata with guard cells. Each stoma is surrounded by a pair of sausage-shaped guard cells. In low light the guard cells lose water and become flaccid, causing the stomata to close. They would normally only close in the dark when no carbon dioxide is needed for photosynthesis.

BBC - GCSE Bitesize: Root hair cells and osmosis

Photosynthetic organisms create order by transfomring the otherwise destructive energy of the sun into chemical bond energy.
Energy is needed for doing work
CAM photosynthesis
(Crassulacean Acid Metabolism)

Photosynthetic events are separated by time
All events happen in the mesophyll cells
PEP Carboxylase is the main enzyme for initial CO2 fixation

"Temporal" (time) Separation
mesophyll cell
CO2 is first converted into a 4-carbon molecule by the enzyme PEP Carboxylase
C4 Photosynthesis
Spatial Separation
Photosynthetic events are separated spatially.

Co2 is first fixed in mesophyll cells by the enzyme PEP Carboxylase and converted to a 4 carbon molecule called malate.

This 4 carbon molecule (malate) is shuttled to the bundle sheath cells, where it enters the Calvin Benson (C3) cycle.
C4 and CAM overcome the tendency of the enzyme RuBisCO to wastefully fix oxygen rather than carbon dioxide in what is called photorespiration.

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