Where are the reaction centers located in the?

Reaction centres are present in all green plants and in many bacteria and algae. Green plants have two reaction centres known as photosystem I and photosystem II and the structures of these centres are complex involving a multisubunit protein.

What is a photosystem and where is it located?

Photosystems are functional and structural units of protein complexes involved in photosynthesis. Together they carry out the primary photochemistry of photosynthesis: the absorption of light and the transfer of energy and electrons. Photosystems are found in the thylakoid membranes of plants, algae, and cyanobacteria.

What is the reaction center of a photosystem?

The heart of photosystem II is the reaction center, where the energy of light is converted into the motion of energized electrons. At the center is a key chlorophyll molecule. When it absorbs light, one of its electrons is promoted to a higher energy.

What type of chlorophyll is in the reaction center?

Chlorophyll A is used in the reaction center. The other pigments absorb the light from the sun that chlorophyll cannot. They then transfer energy to chlorophyll a to be released to the positive electron acceptor. The wavelengths of light will alter the rate of photosynthesis in a plant.

How do reaction centers of photosystem I and II differ?

How do the reaction centers of photosystem I and II differ? a. They preferentially absorb slightly different wavelengths of light. Only photosystem I is found in the thylakoid membranes.

What is produced in photosystem 1?

Ultimately, the electrons that are transferred by Photosystem I are used to produce the high energy carrier NADPH. The combined action of the entire photosynthetic electron transport chain also produces a proton-motive force that is used to generate ATP.

Does photosystem 1 or 2 produce oxygen?

In conclusion, photosystem I generates active oxygen that is damaging not only to itself, but clearly also to photosystem II.

Where are the photosynthetic reaction centers found in plants?

This is done by photosynthetic reaction centers within the plant. All green plants have photosynthetic reaction centers, and they’re also found in many types of algae, as well. Essentially, these are proteins that contain chlorophyll and other co-factors, as well as receptors capable of capturing photons of light.

How many reaction centers does a green plant have?

All green plants have two photosynthetic reaction centers. One is called photosystem I and the other is called photosystem II. These centers are very complex, and are as yet not well understood by science. Algae has only a single reaction center, and because it contains fewer proteins and is much less complex, it is better understood.

Which is part of the reaction center absorbs light?

A photosynthetic reaction centre is a protein that is the site of the light reactions of photosynthesis. The reaction centre contains pigments such as chlorophyll and phaeophytin. These absorb light, promoting an electron to a higher energy level within the pigment.

Where does the reaction of photosystem 2 take place?

This reaction occurs at the reaction centre of photosystem II and takes place in cyanobacteria, algae and green plants. Photosystem II is the photosystem that generates the electron that will eventually reduce NADP +. Photosystem II is present on the thylakoid membranes inside chloroplasts, the site of photosynthesis in green plants.