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What is Noncyclic electron pathway?

What is Noncyclic electron pathway?

Noncyclic Electron Pathway (*SPLITS WATER, PRODUCES NADPH & ATP) 1. This pathway occurs in the thylakoid membranes and requires participation of two light-gathering units: photosystem I (PS I) and photosystem II (PS II).

What is the cyclic electron flow in photosynthesis?

In cyclic electron flow (CEF), electrons are recycled around photosystem I. As a result, a transthylakoid proton gradient (ΔpH) is generated, leading to the production of ATP without concomitant production of NADPH, thus increasing the ATP/NADPH ratio within the chloroplast.

When noncyclic electron flow occurs during photosynthesis what is produced?

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+.

What are the steps in noncyclic electron flow in photosynthesis quizlet?

Terms in this set (7)

  • light hits photosystem 2 and pigments absorb solar energy.
  • water splits & O2, H, and e- are released.
  • energized electrons from the sun and hydrogen from H2O is sent to the electron transport chain.
  • hydrogen gradient is formed inside a thylakoid.

What happens Noncyclic pathway?

In a process called non-cyclic photophosphorylation (the “standard” form of the light-dependent reactions), electrons are removed from water and passed through PSII and PSI before ending up in NADPH. This process requires light to be absorbed twice, once in each photosystem, and it makes ATP .

Why is cyclic electron flow important for photosynthesis?

The light reactions in photosynthesis convert light energy into chemical energy in the forms of ATP and NADPH. The role of cyclic electron transport around PS I is proposed to be essential for balancing the ATP/NADPH production ratio and/or for protecting both photosystems from the damage via stromal over-reduction1.

What are the steps in linear electron flow in photosynthesis?

Terms in this set (8)

  • Photon hits the light-harvesting complex in PSII and excites the electrons in chlorophyll a.
  • Excited electron goes into the primary electron acceptor, Results in P680+
  • Water splits in oxygen – 2 electrons – 2 H+, H+ goes into the lumen, Electrons feed into P680+

What are the two electron carriers in photosynthesis?

In the light-dependent reactions, energy absorbed by sunlight is stored by two types of energy-carrier molecules: ATP and NADPH. The energy that these molecules carry is stored in a bond that holds a single atom to the molecule. For ATP, it is a phosphate atom, and for NADPH, it is a hydrogen atom.

What wavelength of light is most effective in driving photosynthesis?

The best wavelengths of visible light for photosynthesis fall within the blue range (425–450 nm) and red range (600–700 nm). Therefore, the best light sources for photosynthesis should ideally emit light in the blue and red ranges.

What are the two main stages of photosynthesis quizlet?

The two stages of photosynthesis are light reactions and the Calvin Cycle. Light reactions occur within the thylakoids and the Calvin Cycle takes place in the stroma. The light reactions create ATP and NADPH, which are used by the Calvin Cycle which also brings in carbon to produce sugar.