Call us toll-free

AP Bio Photosynthesis Flashcards | Quizlet

Non-cyclic pathway (pathway 2)

Approximate price

Pages:

275 Words

$19,50

science/photosynthesis/The-pathway-of-electrons

Photosynthesis is a process where by energy from light is harvested and used to drive synthesis of organic carbohydrates from carbon dioxide and water. Photosynthesis takes place in chloroplasts and can be divided into two steps: light reactions which require light and dark reactions which do not require light. During light reaction, light energy is captured by photosystems and electrons are transferred among the electron receptors. ATP and NADPH are generated. During dark reactions, CO2 is fixed using ATP and NADPH generated by the light reactions and organic carbohydrates are synthesized via the Calvin Cycle. When the CO2 is first fixed into a 3 carbon compound 3PGA, it is called C3 pathways and these plants are called C3 plants. The disadvantage of C3 plants is that they undergo photorespiration and thus waste some energy gained in light reactions. C4 cycle is the pathway adopted by C4 plants to bypass photorespiration.

Gossypium raimondii C photosynthetic carbon assimilation cycle NAD ME type C pathway

In photosynthesis the electron transport pathway is an integral part of the light reactions. Light that we see and plants use for photosynthesis is a small part of the spectrum of electromagnetic radiation, from just below 400 nm to just above 700 nm. Our peak sensitivity is in the middle of this range at about 550 nm or in the green part of the spectrum. Coincidentally this is the part of the spectrum which plants do not use or "see". They absorb light in the blue and in the red.

Cyclic Electron Flow - Biology As Poetry

McGraw-Hill Flash animation illustrating cyclic and non-cyclic photophosphorylation.

Light reaction and photophosphorylation
Pigments embedded on thylakoid membranes form photosystems. There are of two types: PS I P700, PS II P680. Components of photosystem I and II transfer the electrons from water to NADP via cyclic electron transfer or non-cyclic electron transfer. During electron transfer, the light energy captured by the photosynthetic organisms is transformed into the phosphate bond energy of ATP. This is called photophosphorylation. NADPH is generated during non-cyclic electron transfer.

Breyton C, Nandha B, Johnson GN, Joliot P and Finazzi G (2006) Redox modulation of cyclic electron flow around photosystem I in C3 plants. Biochemistry 45: 13465–13475.

The effect of cyclic electron flow is simply the diversion of more ..

Allen JF (2003) Cyclic, pseudocyclic and noncyclic photophosphorylation: new links in the chain. Trends in Plant Science 8: 15–19.

C4 pathway
C4 cycle is the pathway adopted by C4 plants to conserve the carbon dioxide released via photorespiration. It adopts a new enzyme (PEPC, Phosphoenol pyruvate carboxylase) which does not react with oxygen; it also adopted a separated compartment for CO2 up taking and fixation.

C4 pathway
C4 cycle is the pathway adopted by C4 plants to conserve the carbon dioxide released via photorespiration. It adopts a new enzyme (PEPC, Phosphoenol pyruvate carboxylase) which does not react with oxygen; it also adopted a separated compartment for CO2 up taking and fixation.

Pathway of carbon dioxide fixation and reduction in photosynthesis the reductive pentose phosphate cycleThe diagram
Order now
  • What is non-cyclic photosynthesis and how is ..

    Light dependent Reactions Cyclic Pathway The noncyclic pathway does not yield from BIO 105 at Nicholls State

  • Outline the pathway of cyclic electron flow during ..

    Since the non-cyclic pathway produces both atp and nadph explain the purpose of the cyclic pathway …

  • Non-Cyclic Pathway of Photosynthesis

    During photosynthesis the cyclic electron pathway requires and produces from BIOLOGY 1305 at Texas El Paso

Order now

It is discussed in Photosynthesis: Pathway of Carbon ..

The most common light-dependent reaction in photosynthesis is called noncyclic photophosphorylation. Noncyclic photophosphorylation involves both Photosystem I and Photosystem II and produces ATP and NADPH. During noncyclic photophosphorylation, the generation of ATP is coupled to a one-way flow of electrons from H2O to NADP+.

Cyclic vs. Non-cyclic Electron Flow - Mandeville High …

Harbinson J and Foyer CH (1991) Relationships between the efficiencies of photosystem‐I and photosystem‐II and stromal redox state in carbon dioxide‐free air – evidence for cyclic electron flow in vivo. Plant Physiology 97: 41–49.

Non-cyclic Photosynthesis which in addition to ..

Joët T, Cournac L, Peltier G and Havaux M (2002a) Cyclic electron flow around photosystem I in C‐3 plants. In vivo control by the redox state of chloroplasts and involvement of the NADH‐dehydrogenase complex. Plant Physiology 128: 760–769.

13.4 Cyclic And Non-Cyclic Photophosphorylation.

Dark reaction – Calvin cycle
Second step of photosynthesis is called Calvin’s cycle and it is a dark reaction. There are two stages here, I and II. In Stage I carbon dioxide is incorporated into 5 carbon ribulose bisphosphate. In stage II ribulose bisphosphate is the regenerated.

Difference between Cyclic and Noncyclic Photophosphorylation

To get a (3 carbon) sugar, the sugar acid, PGA must be reduced by the NADPH produced in the light reactions. The rest of the Calvin cycle (which we will not discuss) involves shuffling carbon-carbon bonds to maintain the supply of (5-C) RuBP and to give an output of (6-C) hexose. Just as in glycolysis, all of the intermediates are phosphorylated. The phosphate groups come from the ATP produced in the light reactions. To see this in action:

SEO Keywords Images for Photosynthesis Light Reaction Cyclic

Light reaction and photophosphorylation
Photosystems are of two types: PS I P700, PS II P680. Components of photosystem I and II transfer the electrons from water to NADP. Light is absorbed by these photosystems and electrons are transferred from water to NADP. Photophosphorylation is a process where the light energy captured by the photosynthetic organisms is transformed into the phosphate bond energy of ATP. During the transfer of electrons, ATP is synthesized. Electron flow is cyclic. As a result oxygen is not released and ATP is formed as a result of proton gradient created by Cytochrome bf pump.

Order now
  • Kim

    "I have always been impressed by the quick turnaround and your thoroughness. Easily the most professional essay writing service on the web."

  • Paul

    "Your assistance and the first class service is much appreciated. My essay reads so well and without your help I'm sure I would have been marked down again on grammar and syntax."

  • Ellen

    "Thanks again for your excellent work with my assignments. No doubts you're true experts at what you do and very approachable."

  • Joyce

    "Very professional, cheap and friendly service. Thanks for writing two important essays for me, I wouldn't have written it myself because of the tight deadline."

  • Albert

    "Thanks for your cautious eye, attention to detail and overall superb service. Thanks to you, now I am confident that I can submit my term paper on time."

  • Mary

    "Thank you for the GREAT work you have done. Just wanted to tell that I'm very happy with my essay and will get back with more assignments soon."

Ready to tackle your homework?

Place an order