What is the difference between oxygenic and anoxygenic photosynthesis?

What is the difference between oxygenic and anoxygenic photosynthesis?

Because oxygen is generated as a byproduct and is released, this type of photosynthesis is referred to as oxygenic photosynthesis. However, when other reduced compounds serve as the electron donor, oxygen is not generated; these types of photosynthesis are called anoxygenic photosynthesis.

What occurs in anoxygenic photosynthesis?

Anoxygenic photosynthesis is a bacterial photosynthesis that occurs under anaerobic conditions, using the photosynthetic electron transport chain in a non–cyclic mode and reduced inorganic electron donors, such as hydrogen sulfide, hydrogen, or ferrous ion, as electron donors.

Is oxygenic photosynthesis cyclic?

Electrons cycle back to reduce P870, so this is a cyclic electron transport chain leading to generation of ATP through cyclic photophosphorylation. Unlike in oxygenic photosynthesis, where NADPH is the terminal electron acceptor, no NADPH is made because electrons are cycling back into the system.

Does anoxygenic photosynthesis use two reaction centers?

Although the type II reaction centers are structurally and sequentially analogous to Photosystem II (PSII) in plant chloroplasts and cyanobacteria, known organisms that exhibit anoxygenic photosynthesis do not have a region analogous to the oxygen-evolving complex of PSII.

What is the purpose of anoxygenic photosynthesis?

Anoxygenic photosynthesis is the phototrophic process where light energy is captured and converted to ATP, without the production of oxygen. Water is therefore not used as an electron donor.

Which is Anoxygenic?

Anoxygenic phototrophs have photosynthetic pigments called bacteriochlorophylls similar to chlorophyll found in eukaryotes. Purple sulfur bacteria are a group of Proteobacteria capable of photosynthesis, anaerobic or microaerophilic, and often found in hot springs or stagnant water.

What is used in anoxygenic photosynthesis?

Definition. Anoxygenic photosynthesis is a bacterial photosynthesis that occurs under anaerobic conditions, using the photosynthetic electron transport chain in a non–cyclic mode and reduced inorganic electron donors, such as hydrogen sulfide, hydrogen, or ferrous ion, as electron donors.

Why is oxygen not generated in anoxygenic photosynthesis?

This is why oxygen is not generated during this process. Only one photosystem is involved with anoxygenic photosynthesis. Hence electrons are transported in a cyclic chain and returned to the same photosystem. Therefore, anoxygenic photosynthesis is also known as cyclic photophosphorylation.

How is the electron transport chain in anoxygenic photosynthesis cyclic?

The electron transport chain of anoxygenic phototrophs is cyclic, meaning the electrons used during photosynthesis are fed back into the system, therefore no electrons are left over to oxidize water into oxygen.

How are anoxygenic organisms different from eukaryotic organisms?

Anoxygenic photosynthesis produces cellular energy ( ATP ), without oxygen as a by-product. As opposed to eukaryotic organisms, which rely on chlorophylls for photosynthesis, anoxygenic organisms rely on bacteriochlorophylls.

How are the two types of photosynthesis classified?

Photosynthesis can be divided into two categories such as oxygenic and anoxygenic photosynthesis based on the generation of oxygen.