Photosynthesis
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Photosynthesis occurs in the chloroplasts of plant cells, which contain stacks of thylakoids where the light-dependent and light-independent reactions take place. Light energy is absorbed by pigments like chlorophyll and carotenoids in the thylakoids, causing electrons to be transferred between photosystems and pumped across the membrane, generating a proton gradient used by ATP synthase to make ATP and ultimately sugars from carbon dioxide in the Calvin cycle.
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Cellular respiration involves the breakdown of glucose to extract energy in the form of ATP. It occurs in three main stages: glycolysis, the Krebs cycle, and the electron transport chain. Glycolysis breaks down glucose into pyruvate, producing a small amount of ATP. The Krebs cycle further oxidizes pyruvate and produces more ATP and energy carriers like NADH and FADH2. Finally, the electron transport chain uses these carriers to pump protons across the inner mitochondrial membrane, building up a proton gradient. ATP synthase uses this gradient to produce large amounts of ATP through chemiosmosis. The overall process extracts energy from glucose and transfers it to ATP to fuel cellular work.
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Photosynthesis converts light energy to chemical energy through a series of complex reactions. Chlorophyll and other pigments in chloroplasts absorb light which is used to split water and produce oxygen. This provides electrons and hydrogen used to reduce NADP and produce ATP through an electron transport chain. The Calvin cycle then uses ATP and NADPH to fix carbon dioxide and produce glucose or other carbohydrates as food for the plant. Environmental factors like light, temperature, and water availability can impact the rate of photosynthesis. Some plants have evolved C4 or CAM pathways to more efficiently fix carbon dioxide.
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Photosynthesis is the process by which plants, algae, and some bacteria use sunlight, water and carbon dioxide to produce oxygen and energy in the form of glucose. Chlorophyll, located in chloroplasts, absorbs sunlight and uses it to convert carbon dioxide and water into oxygen and energy-rich glucose. Two stages occur - the light-dependent reactions where ATP and NADPH are produced, and the light-independent reactions where carbon is incorporated into carbohydrates like glucose using the ATP and NADPH produced in the light reactions.
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Photosynthesis has two phases: the light reaction and dark reaction. The light reaction uses photosynthetic pigments like chlorophyll to convert solar energy into chemical energy in the form of ATP and NADPH. It occurs in the thylakoid membranes of chloroplasts. The dark reaction uses these products to fix carbon and produce sugars. The light reaction involves three steps: excitation of photosystems, production of ATP via electron transport, and reduction of NADP+ and photolysis of water. This is summarized by the Z-scheme which represents the electron flow and energy changes. Photophosphorylation uses the proton gradient generated by electron transport to synthesize ATP via chemiosmosis.
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The document outlines the key processes and components of photosynthesis. It discusses how chloroplasts use light energy from the sun to transform carbon dioxide and water into oxygen and energy-rich glucose through two stages - the light-dependent reactions which generate ATP and NADPH, and the light-independent Calvin cycle which uses these products to fix carbon into sugars. Chlorophylls and other pigments play a crucial role in absorbing sunlight for photosynthesis, which is why plants appear green.
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Photosynthesis occurs in plant leaves and involves two main phases: the light reactions and the dark reactions. In the light reactions, which take place in the thylakoid membranes of chloroplasts, light energy is absorbed by chlorophyll and used to convert water to oxygen and produce ATP and NADPH. In the dark reactions, also called the Calvin cycle, the ATP and NADPH produced in the light reactions are used to convert carbon dioxide into glucose in three main steps: carbon fixation, reduction, and regeneration. Photosynthesis provides the basic energy source for essentially all life on Earth.
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Photosystem I is located in the membrane of cyanobacteria and plants. It contains proteins, chlorophylls, carotenoids, and other cofactors that transfer electrons during photosynthesis. PsaA and PsaB form the core where primary electron transfer occurs. Electrons are transferred from P700 to ferredoxin via a chain containing chlorophyll, phylloquinone, and iron-sulfur clusters. Ferredoxin then transfers electrons to ferredoxin-NADP+ reductase to reduce NADP+ to NADPH, providing energy for the Calvin cycle.
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Photosynthesis converts light energy to chemical energy through a series of complex reactions. Chlorophyll and other pigments in chloroplasts absorb light which is used to split water and produce oxygen. This provides electrons and hydrogen used to reduce NADP and produce ATP through an electron transport chain. The Calvin cycle then uses ATP and NADPH to fix carbon dioxide and produce glucose or other carbohydrates as food for the plant. Environmental factors like light, temperature, and water availability can impact the rate of photosynthesis. Some plants have evolved C4 or CAM pathways to more efficiently fix carbon dioxide.
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Photosynthesis occurs in plant leaves and involves two main phases: the light reactions and the dark reactions. In the light reactions, which take place in the thylakoid membranes of chloroplasts, light energy is absorbed by chlorophyll and used to convert water to oxygen and produce ATP and NADPH. In the dark reactions, also called the Calvin cycle, the ATP and NADPH produced in the light reactions are used to convert carbon dioxide into glucose in three main steps: carbon fixation, reduction, and regeneration. Photosynthesis provides the basic energy source for essentially all life on Earth.
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References
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2) Photosystem I contains a reaction center called P700 and associated antenna pigments that absorb light and transfer energy to P700. It is a multi-subunit protein complex located in the stroma lamellae.
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Photosynthesis
Photosynthesis involves two main stages - the light reactions and dark reactions. In the light reactions, chlorophyll in chloroplasts absorbs sunlight to split water, producing oxygen and energized electrons. These electrons are used to produce ATP and NADPH through an electron transport chain. In the dark reactions, ATP and NADPH are used to fix carbon dioxide and produce glucose through the Calvin cycle. Six turns of the Calvin cycle are required to fix one molecule of carbon dioxide into glucose. Photosynthesis provides organic compounds for growth and energy storage in plants.
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The document discusses the electron transport system in chloroplasts. It describes how light is absorbed by photosystems which excites electrons that are passed through an electron transport chain across the thylakoid membrane. This powers the active transport of hydrogen ions, creating a proton gradient that drives ATP synthesis through photophosphorylation. Two pathways are discussed: non-cyclic electron flow which produces both ATP and NADPH, and cyclic electron flow which only produces ATP without reducing NADP+.
Ph0tosystemPhotosystem: Reaction center surrounded by several light-harvestin...
Photosynthesis has two photosystems, Photosystem I and Photosystem II, that work sequentially to harness light energy to produce chemical energy. Photosystem II uses light energy to split water, releasing electrons that are transferred through an electron transport chain, pumping protons across the membrane and producing oxygen. The energized electrons are then passed to Photosystem I, which uses them to reduce NADP+ to NADPH to be used in the Calvin cycle for carbon fixation. Together, the two photosystems convert light energy to chemical energy in the form of ATP and NADPH.
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This document summarizes photosynthesis and the structures and processes involved. It defines key terms like autotrophs, heterotrophs, and chloroplasts. It describes how chloroplasts enable photosynthesis through structures like the grana and stroma. The light-dependent and light-independent stages are outlined, including the roles of water, photophosphorylation, and the Calvin Cycle. Limiting factors like temperature, carbon dioxide concentration, and light intensity are also discussed.
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2) During aerobic respiration, glucose breakdown yields up to 36 ATP molecules, with most ATP generated in the mitochondria. Anaerobic respiration like fermentation only yields 2 ATP per glucose without oxygen.
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This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors.
References
1. Taiz & Zeiger
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This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors. This ppt contain an easy understanding guide for teachers and students. All the contents are reviewed and edited by senior professors.
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In this ppt, you will learn about photosystem first of photosynthesis, with video and animation such a nice presentation. electron movement by animation, see and understand the system.
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Photosynthesis converts sunlight into chemical energy through a series of light-dependent and light-independent reactions. The light reactions use energy from sunlight to produce ATP and NADPH, which provide energy and electrons to drive the Calvin cycle. The Calvin cycle fixes carbon from carbon dioxide into organic three-carbon sugars like glyceraldehyde-3-phosphate, using the ATP and NADPH produced in the light reactions. One sugar molecule is used for growth, while five are recycled to regenerate the starter molecule for the next round of the Calvin cycle.
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all 2D - i uploaded it here in fb for you to study... refresh lng para hindi hard sa part nyo during exam..
teofe♥
Photosynthesis
Plants use photosynthesis to convert carbon dioxide and water into glucose and oxygen using energy from sunlight. Photosynthesis is performed by plants and cyanobacteria and involves two photosystems, photosystem I and photosystem II. In photosynthesis, light energy is absorbed by chlorophyll, exciting electrons that are transferred through an electron transport chain between the two photosystems to generate ATP through chemiosmosis and reduce NADP+ to NADPH.
Kumar Rajnish
The document summarizes key aspects of photosynthesis including the structure and function of the cytochrome b6f complex and photosystem I. It discusses:
1) The cytochrome b6f complex transfers electrons from photosystem II to photosystem I while pumping protons across the thylakoid membrane. It is composed of four large subunits including cytochrome f and b6 and four small subunits.
2) Photosystem I contains a reaction center called P700 and associated antenna pigments that absorb light and transfer energy to P700. It is a multi-subunit protein complex located in the stroma lamellae.
3) Both complexes play important roles in the light-dependent reactions of
Photosynthesis
Photosynthesis is a oxidation reduction process in which water is oxidized and carbon dioxide is reduced to carbohydrate level, the water and oxygen being by product.
Photosynthesis
This document summarizes key aspects of photosynthesis. It describes that photosynthesis occurs in plants, algae, and photosynthetic bacteria. Light energy is captured and used to fix carbon from carbon dioxide into sugars, with oxygen as a byproduct. The process takes place in chloroplasts and involves two stages - the light reactions where ATP and NADPH are produced, and the dark reactions where CO2 is fixed into sugars. Pigments like chlorophyll and accessory pigments harvest light energy which is used to power electron transport and produce chemical energy carriers.
Photosynthesis dark reaction
This document provides an overview of photosynthesis and the dark reaction phase. It discusses key topics like the Calvin cycle, the structures of chloroplasts, and the C4 and CAM pathways. The Calvin cycle fixes carbon dioxide into organic molecules like glucose. It consists of carbon fixation, reduction reactions, and ribulose bisphosphate regeneration. The C4 pathway occurs in some plants and involves a four-carbon compound to concentrate carbon dioxide and prevent photorespiration. CAM plants open their stomata at night to fix carbon dioxide into malic acid, then release it for the Calvin cycle during the day.
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Bacteria are classified into several phyla based on their characteristics. Cyanobacteria are photosynthetic while Spirochetes are spiral shaped, with Treponema pallidum causing syphilis. Proteobacteria is the largest phylum and contains both pathogenic and beneficial bacteria. Bacterial cells have structures like cell walls, cell membranes, cytoplasm, and sometimes capsules or pili that aid in functions and survival. Bacteria can obtain nutrients through autotrophy or heterotrophy like saprophytism. Genetic recombination between bacteria can occur through conjugation, transduction, or transformation. Bacterial diseases harm hosts through exotoxins, endotoxins, or digestive enzymes, and antibiotics are used to
Bacteria1
Bacteria are some of the oldest life forms on Earth, with fossil evidence placing their emergence at around 3.5 billion years ago. They are classified into two kingdoms, Archaea and Eubacteria, based on rRNA sequencing. While Archaea and Eubacteria both lack nuclei, they differ in their cell wall structure - Archaea have no peptidoglycan but special lipids, while Eubacteria contain peptidoglycan. Eubacteria are further classified by their shape as cocci, bacilli, or spirilla and differentiated as Gram positive or Gram negative based on their staining properties related to cell wall thickness.
Viruses
Viruses were first discovered in the 1800s and characterized in the 1930s by Wendell Stanley. Viruses are not considered alive as they require a host cell to reproduce and are comprised of protein, nucleic acids, and sometimes carbohydrates. Viruses have specific shapes and are categorized by their nucleic acid content and structure. Retroviruses contain reverse transcriptase and have an RNA genome. Viroids and prions are small infectious particles that can self-replicate and cause diseases in plants and mammals. Viruses replicate using either lytic or lysogenic cycles. [END SUMMARY]
Rna And Protein Synthesis Ss
This document summarizes RNA and protein synthesis. It describes that DNA is made of nucleotides and has a double helix structure. During transcription, RNA polymerase builds an RNA strand that is complementary to DNA. The RNA can be messenger RNA (mRNA), transfer RNA (tRNA), or ribosomal RNA (rRNA). mRNA carries the genetic code from the nucleus to the ribosome. During translation, mRNA matches up with tRNA to add amino acids together and form a protein according to the mRNA's code.
DNA
This document summarizes key experiments and discoveries that determined DNA is the genetic material:
- Griffith (1928) and Avery (1944) provided early evidence through experiments with bacteria and pneumococcus.
- Hershey and Chase (1952) used radioactive isotopes to show that DNA, not protein, enters the cell during bacterial infection.
- The structure of DNA was discovered to be a double helix with nucleotides containing nitrogenous bases that pair up in a specific way.
- DNA replication requires several enzymes and occurs through a semi-conservative process at the replication fork. DNA repair mechanisms reduce mutations from replication mistakes.
Cellular Respiration
Cellular respiration is the process by which cells break down glucose to extract energy. It has two main pathways - glycolysis, which breaks down glucose into pyruvate with or without oxygen, and the Krebs cycle and electron transport chain, which use oxygen to further break down pyruvate into carbon dioxide and generate large amounts of ATP through electron transport. In the presence of oxygen, cellular respiration is highly efficient and produces 38 ATP, whereas without oxygen, fermentation takes place and only 2 ATP are produced.
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Overview
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