Table of Contents
What happens in a photosystem?
The light reaction occurs in two photosystems (units of chlorophyll molecules). Photosystem I obtains replacement electrons from the electron transport chain. ATP provides the energy and NADPH provides the hydrogen atoms needed to drive the subsequent photosynthetic dark reaction, or Calvin cycle.
What is photosystem called?
PSI
Photosystem I (PSI, or plastocyanin–ferredoxin oxidoreductase) is one of two photosystems in the photosynthetic light reactions of algae, plants, and cyanobacteria.
What is photosystem made of?
Each photosystem is composed of a core complex and a peripheral antenna system, light harvesting complex I (LHCI) for PSI and light harvesting complex II (LHCII) for PSII, respectively.
What is photosystem I and energy carrying molecules?
In the first part of photosynthesis, the light-dependent reaction, pigment molecules absorb energy from sunlight. The most common and abundant pigment is chlorophyll a. Photosystem I absorbs a second photon, which results in the formation of an NADPH molecule, another energy carrier for the Calvin cycle reactions.
What are the two components to a photosystem?
Each photosystem consists of two closely linked components: the first is the antenna complex formed by hundreds of pigment molecules that capture photons and transfer the harvested light energy to the second component named the reaction center, which possesses Chl a molecules in a matrix of protein.
What does a photosystem consist of?
A photosystem consists of a light-harvesting complex and a reaction center . Pigments in the light-harvesting complex pass light energy to two special chlorophyll a molecules in the reaction center. The light excites an electron from the chlorophyll a pair, which passes to the primary electron acceptor.
Which photosystem begins the process of photosynthesis?
The process begins in Photosystem II, where the light harvesting complex absorbs photons and relays that energy to the reaction centre, which can refer to a specific protein within photosystem II or, more specifically, to a pair of chlorophylls within that protein. What happens there? The first goal of photosynthesis is the production of ATP.
Where are photosystems 1 and 2 found?
Difference Between Photosystem 1 and 2 Location. Photosystem 1: Photosystem 1 is located on the outer surface of the thylakoid membrane. Photocenter. Photosystem 1: The photocenter of the photosystem 1 is P700. Absorbing Wavelength. Photophosphorylation. Photolysis. Main Function. Electron Replacement. Pigments. Compositon of the Core. Conclusion.