What is the electron carrier in photosystem 2?
What is the electron carrier in photosystem 2?
The soluble molecule plastoquinone, or PQ, acts as the electron carrier from photosystem II to the cytochrome b6f complex. The cytochrome b6f complex pumps protons into the thylakoid lumen as it transfers electrons from plastoquinone to plastocyanin.
What does the photosystem 2 do?
Photosystem 2 (PS2) is the part of the photosynthetic apparatus that uses light energy to split water releasing oxygen, protons and electrons.
Does photosystem 2 have chlorophyll A or B?
Photosystems I and II in the thylakoid membranes. PSI is located at the outer surface of the thylakoid membrane, and contains chlorophyll b; chlorophyll a (in the forms: a-670, a-680, a-695, a-700), and carotenoids; and one particular chlorophyll a-700 form (named Chl a-P700) is the active reaction center.
What does the photosystem II contain?
Because of this, P680+ is highly oxidizing and can take part in the splitting of water. ions per monomer. There are several crystal structures of photosystem II….Structure of complex.
| Cofactor | Function |
|---|---|
| Manganese center | Also known as the oxygen evolving center, or OEC |
How are Photosystem II electrons replaced?
Photosystem II obtains replacement electrons from water molecules, resulting in their split into hydrogen ions (H+) and oxygen atoms. The oxygen atoms combine to form molecular oxygen (O2), which is released into the atmosphere. This creates a high concentration of ions inside the lumen.
Does photosystem 2 produce ATP?
Electrons are transferred sequentially between the two photosystems, with photosystem I acting to generate NADPH and photosystem II acting to generate ATP. Electron transport through photosystem II is thus coupled to establishment of a proton gradient, which drives the chemiosmotic synthesis of ATP.
What is the difference between photosystem I and photosystem II?
Photosystem I (PS I) and photosystem II (PS II) are two multi-subunit membrane-protein complexes involved in oxygenic photosynthesis. The main difference between photosystem 1 and 2 is that PS I absorbs longer wavelengths of light (>680 nm) whereas PS II absorbs shorter wavelengths of light (<680 nm).
Does photosystem 2 come first?
There are two types of photosystems in the light-dependent reactions, photosystem II (PSII) and photosystem I (PSI). PSII comes first in the path of electron flow, but it is named as second because it was discovered after PSI.