• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Exam 2
Exam 2

... the membrane generate a pH gradient of DpH = 1.0 (interior higher by one unit) and a membrane potential of –120mv (interior negative). This “proton-motive” force can be used to synthesize ATP from ADP and phosphate inside the cell. Here is some more information that may be useful as you solve the pr ...
Derived copy of Bis2A 07.3 Oxidation of Pyruvate and the Citric Acid
Derived copy of Bis2A 07.3 Oxidation of Pyruvate and the Citric Acid

... that reduce NAD+ to NADH and release carboxyl groups that form CO2 molecules. α-Ketoglutarate is the product of step three, and a succinyl group is the product of step four. CoA binds the succinyl group to form succinyl CoA. The enzyme that catalyzes step four is regulated by feedback inhibition of ...
Introduction to Physiology: The Cell and General Physiology
Introduction to Physiology: The Cell and General Physiology

... to pyruvate and then, via gluconeogenesis, to glucose. – Why would muscle transport lactate to the liver for conversion back to pyruvate? NAD+ is needed for that step, and the point of making lactate in the first place was because NAD+ was too low. ...
Adenylate Energy Charge
Adenylate Energy Charge

... The events which occur in the 3 h period after harvesting starts and before sampling of starving bacteria commences are clearly of interest. The organisms do not all enter starvation simultaneously but do so continuously as they are removed from the culture medium over the 90 min required for harves ...
Biological energy
Biological energy

... by substrate-level by oxidative phosphorylation, depending on which shuttle transports electrons phosphorylation from NADH in cytosol ...
07-Photosynthesis
07-Photosynthesis

... water into sugar, oxygen, and other organic compounds. This process is often summarized by the following reaction:  C6H12O6 + 6 O2 6 H2O + 6 CO2 + light energy  ...
Understanding oxidative stress and antioxidant functions in order to
Understanding oxidative stress and antioxidant functions in order to

... interactions between the AsA-GSH pathway and the PRXs demonstrate cross-talk between the individual ROS-metabolizing pathways of the chloroplasts. The AsA-GSH pathway has a higher specificity for H2O2 and the chloroplast APX has higher activities than PRXs but the PRXs have a broad specificity of to ...
I. Overview of Photosynthesis: 4 STAGES: 1. Light Absorption
I. Overview of Photosynthesis: 4 STAGES: 1. Light Absorption

... 3. Many plants have photorespiration 4. C4 plants maximize CO2 fixation using a C4 pathway that increase [CO2] conc. 5. CAM plants minimize water loss by fixing CO2 at night. ...
Lecture 3: Glycolysis Part 2 - University of California, Berkeley
Lecture 3: Glycolysis Part 2 - University of California, Berkeley

... A hydride moiety, the proton plus two electrons, is transferred onto NAD+. This is a strongly downhill reaction. The oxidation is on the carbon. This is aided by the abstraction of the proton on the -OH group, ending up with a thioester. Thioesters. The hydrolysis of thioesters is much more strongly ...
K - UCLA Chemistry and Biochemistry
K - UCLA Chemistry and Biochemistry

... (1 ATP, 1 GTP)—these first two reactions are that expensive! ...
pptx
pptx

... (1 ATP, 1 GTP)—these first two reactions are that expensive! ...
File
File

... – Regulated by ATP, divalent metals, and other metabolites ...
Bis2A 07.3 Oxidation of Pyruvate and the Citric
Bis2A 07.3 Oxidation of Pyruvate and the Citric

... that reduce NAD+ to NADH and release carboxyl groups that form CO2 molecules. α-Ketoglutarate is the product of step three, and a succinyl group is the product of step four. CoA binds the succinyl group to form succinyl CoA. The enzyme that catalyzes step four is regulated by feedback inhibition of ...
Mutations in the Subunit of Photosystem II and Resistance to the
Mutations in the Subunit of Photosystem II and Resistance to the

... the double m utant ID tow ard various herbicides. R/S is the ratio of the inhibitor concentration blocking half o f the PS II activity o f the m utant to that of the wild type. F or com parison, R/S of the single m utant 266 (Thr) and of the single m utant 264 (Ala) are also presented. Concerning io ...
Name
Name

... KEY CONCEPT Fermentation allows the production of a small amount of ATP without oxygen. When oxygen is not available in cells, fermentation takes place instead. Fermentation is an anaerobic process that allows glycolysis to continue, but does not produce ATP on its own. The main function of fermenta ...
lecture 6 ppt
lecture 6 ppt

... Electron transport chain (ETC) • ETC  e- collection molecules • embedded on inner mitochondrial membrane • accept e- in turn • e- ultimately accepted by O2 ...
Photosynthesis: CO assimilation and sugar metabolism
Photosynthesis: CO assimilation and sugar metabolism

... Thus, soybean yields only 27% of the energy of corn. What about new energy crops? For Miscanthus, dry wt yields of cellulose is approaching 40,000 lb/acre, or about 10-times more energy than available in starch from corn seed. That is why long-term biofuel solutions from higher plants focus on cellu ...
Chem 301 Biological Chemistry I Laboratory Lab 7: Protein
Chem 301 Biological Chemistry I Laboratory Lab 7: Protein

... configuration, giving off the energy that was just absorbed. Some of the states in the system, however will lose only some energy in non-radiative processes (those that do not emit radiation) and will decay to a lower (but still excited) energy state. Within each electronic energy level are all of t ...
BSCS Chapter 04
BSCS Chapter 04

... clusters, called photosystems (PS) I and II. • The chlorophyll and other pigments in each photosystem absorb light energy and transfer it from one molecule to the next. • All this energy is funneled to a specific chlorophyll a molecule called the reaction center. ...
C h e m g u id e   –... DNA:  PROTEIN SYNTHESIS
C h e m g u id e –... DNA: PROTEIN SYNTHESIS

... carrying a glycine attaches to the chain next door to the molecule carrying the methionine. Its anticodon will be CCA. The ribosome now moves along the chain to the next codon – GUA. At the same time a peptide bond is formed between the methionine and the glycine, and the methionine breaks away from ...
Medical Biochemistry Review #2 By
Medical Biochemistry Review #2 By

... – Basically coupling electron flow through the ETC to ATP synthesis – The Respiratory complexes are proton pumps. As electrons pass through complexes I, III, and IV, hydrogen ions are pumped across the inner mitochondrial membrane into the intermembrane space. – The proton concentration in the inter ...
Chapter 18 Metabolic Pathways and Energy Production
Chapter 18 Metabolic Pathways and Energy Production

... • oxidized and reduced as hydrogen and/or electrons are transferred from one carrier to the next • FMN, Fe-S, coenzyme Q, and cytochromes • embedded in four enzyme complexes: I, II, III, and IV ...


... two α-helical segments that are imbedded in the membrane. A “top view” of this protein is shown on the right. Briefly discuss the following aspects of the structure of this protein. i) What other type of secondary or super-secondary structures are seen in membrane proteins. Why? ii) What is the dist ...
Chapter 9: Pathways that Harvest Chemical
Chapter 9: Pathways that Harvest Chemical

... Energy is stored in the covalent bonds of fuels, and it can be released and transformed. Wood burning in a campfire releases energy as heat and light. In cells, fuel molecules release chemical energy that is used to make ATP, which in turn drives endergonic reactions. ATP is central to the energy tr ...
Key enzymes in glycolysis
Key enzymes in glycolysis

... - Pyruvate: enters the mitochondria & is converted into acetyl CoA. Acetyl CoA enters citric acid cycle (Krebs cycle) to yield energy in the form of ATP - NADH: utilizes mitochondria & oxygen to yield energy 2- In cells with no mitochondria or adequate oxygen (or Both) (Anaerobic glycolysis) Lactate ...
< 1 ... 33 34 35 36 37 38 39 40 41 ... 286 >

Light-dependent reactions

In photosynthesis, the light-dependent reactions take place on the thylakoid membranes. The inside of the thylakoid membrane is called the lumen, and outside the thylakoid membrane is the stroma, where the light-independent reactions take place. The thylakoid membrane contains some integral membrane protein complexes that catalyze the light reactions. There are four major protein complexes in the thylakoid membrane: Photosystem II (PSII), Cytochrome b6f complex, Photosystem I (PSI), and ATP synthase. These four complexes work together to ultimately create the products ATP and NADPH.[.The two photosystems absorb light energy through pigments - primarily the chlorophylls, which are responsible for the green color of leaves. The light-dependent reactions begin in photosystem II. When a chlorophyll a molecule within the reaction center of PSII absorbs a photon, an electron in this molecule attains a higher energy level. Because this state of an electron is very unstable, the electron is transferred from one to another molecule creating a chain of redox reactions, called an electron transport chain (ETC). The electron flow goes from PSII to cytochrome b6f to PSI. In PSI, the electron gets the energy from another photon. The final electron acceptor is NADP. In oxygenic photosynthesis, the first electron donor is water, creating oxygen as a waste product. In anoxygenic photosynthesis various electron donors are used.Cytochrome b6f and ATP synthase work together to create ATP. This process is called photophosphorylation, which occurs in two different ways. In non-cyclic photophosphorylation, cytochrome b6f uses the energy of electrons from PSII to pump protons from the stroma to the lumen. The proton gradient across the thylakoid membrane creates a proton-motive force, used by ATP synthase to form ATP. In cyclic photophosphorylation, cytochrome b6f uses the energy of electrons from not only PSII but also PSI to create more ATP and to stop the production of NADPH. Cyclic phosphorylation is important to create ATP and maintain NADPH in the right proportion for the light-independent reactions.The net-reaction of all light-dependent reactions in oxygenic photosynthesis is:2H2O + 2NADP+ + 3ADP + 3Pi → O2 + 2NADPH + 3ATPThe two photosystems are protein complexes that absorb photons and are able to use this energy to create an electron transport chain. Photosystem I and II are very similar in structure and function. They use special proteins, called light-harvesting complexes, to absorb the photons with very high effectiveness. If a special pigment molecule in a photosynthetic reaction center absorbs a photon, an electron in this pigment attains the excited state and then is transferred to another molecule in the reaction center. This reaction, called photoinduced charge separation, is the start of the electron flow and is unique because it transforms light energy into chemical forms.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report