Hydrogen Ions
hydrogen ions
Protons are pumped across the thylakoid membrane, where they flow back through ATP synthase which synthesizes ATP.
The thylakoid lumen is the compartment bounded by the thylakoid membrane. It plays a vital role for photophosphorylation during photosynthesis. During the light-dependent reaction, protons are pumped across the thylakoid membrane into the lumen making it acidic down to pH 4.
Chemiosmosis in the thylakoid membrane results in the synthesis of ATP during light reaction. Thylakoid membranes contain proteins. These proteins make use of light energy to drive electron transport chains. This generates a chemiosmotic potential across the thylakoid membrane and NADPH. The ATP synthase enzyme uses the chemiosmotic potential to make ATP during photo- phosphorylation.
the flow of electrons through electron transport chain II
Facilitated diffusion uses proteins to move a molecule across the cell membrane without energy.
across the thylakoid membrane
across the thylakoid membrane
Protons are pumped across the thylakoid membrane, where they flow back through ATP synthase which synthesizes ATP.
The thylakoid lumen is the compartment bounded by the thylakoid membrane. It plays a vital role for photophosphorylation during photosynthesis. During the light-dependent reaction, protons are pumped across the thylakoid membrane into the lumen making it acidic down to pH 4.
Synthesis of ATP
The thylakoid lumen is the compartment bounded by the thylakoid membrane. It plays a vital role for photophosphorylation during photosynthesis. During the light-dependent reaction, protons are pumped across the thylakoid membrane into the lumen making it acidic down to pH 4.
Chemiosmosis in the thylakoid membrane results in the synthesis of ATP during light reaction. Thylakoid membranes contain proteins. These proteins make use of light energy to drive electron transport chains. This generates a chemiosmotic potential across the thylakoid membrane and NADPH. The ATP synthase enzyme uses the chemiosmotic potential to make ATP during photo- phosphorylation.
The cell use something called a protein channel that helps larger particles across the cell membrane.
where does the energy used to establish the proton gradient across the thylakoid membrane come from? In other words, from splitting of water. well that's not what he said but there you go.
Electron transport chain
The pigment molecules and electron transport chains involved in the light-dependent reactions of photosynthesis are embedded in the thylakoid membrane. As energy is released from electrons traveling through the chain of acceptors, it is used to pump protons (that is, H+ ions) from the stroma of the chloroplast across the thylakoid membrane and into the center of the thylakoid. Thus, protons accumlate within the thylakoids, lowering the pH of the thylakoid interior and making it more acidic. A proton gradient possesses potential energy that can be used to form ATP.Protons are prevented from diffusing out of the thylakoid because the thylakoid membrane is impermeable to protons except at certain points bridged by an enzyme called ATP synthase. This protein extends across the thylakoid membrane and forms a channel through which protons can leave the thylakoid. As the protons pass through ATP synthetase, energy is released, and this energy is tapped by ATP synthase to form ATP from ADP and inorganic phosphate. The coupling of ATP synthesis to a protein gradient formed by energy released during electron transport is called chemiosmosis.
The pigment molecules and electron transport chains involved in the light-dependent reactions of photosynthesis are embedded in the thylakoid membrane. As energy is released from electrons traveling through the chain of acceptors, it is used to pump protons (that is, H+ ions) from the stroma of the chloroplast across the thylakoid membrane and into the center of the thylakoid. Thus, protons accumlate within the thylakoids, lowering the pH of the thylakoid interior and making it more acidic. A proton gradient possesses potential energy that can be used to form ATP.Protons are prevented from diffusing out of the thylakoid because the thylakoid membrane is impermeable to protons except at certain points bridged by an enzyme called ATP synthase. This protein extends across the thylakoid membrane and forms a channel through which protons can leave the thylakoid. As the protons pass through ATP synthetase, energy is released, and this energy is tapped by ATP synthase to form ATP from ADP and inorganic phosphate. The coupling of ATP synthesis to a protein gradient formed by energy released during electron transport is called chemiosmosis.