This is my essay question in Biology (A2) for next week and I have all the details on how energy is trapped but where is it stored? Is it in ATP? oops, I just answered my own question lolH'W: Describe how energ is trapped by green plants and stored during the light dependant stage in photosynthes?
lol
Photon's of light pass their energy across to chlorophyll in photosystem 2 causing an excited electron to be released
The excited electron causes water to split into hydrogen ions, oxygen and an electron (which replaces the electron lost from the photosystem). This is known as photolysis.
The electron is passed to a protein that pumps hydrogens across the membrane.
It is then passed on to photosystem 1 where it has a second boost of energy from the sunlight.
Its passed on to a final protein carrier that combines it with NADP and a hydrogen ion to form NADPH
The energy that has been used to pump the hydrogen ions across the membrane creates a gradient of ions (remember they cannot simply cross between phospholipids as they're charged) and they flood back across a protein channel, down the concentration gradient.
The energy of the movement of the hydrogen ions is used to combing ADP and a phosphate to form ATP. The name of the protein channel is ATP synthetase.
So most of the energy is stored in ATP, some (what energy remains with the electron) will be placed in the NADPHH'W: Describe how energ is trapped by green plants and stored during the light dependant stage in photosynthes?
the molecules absorb the light energy of the sun and it will be enrgyzed and it will create ATp or the adenosine triphosphate and NADPH or the nicotinamide adenine dinucleotide triphosphate
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment