What is the function of photosystem I?

Photosystem I, a membrane protein complex found in all oxygenic photosynthetic organisms, uses light energy to transfer electrons from plastocyanin to ferredoxin.

What is the function of photosystem I quizlet?

Photosystem I produces NADPH, which is similar in function to the NADH and FADH2 produced by the citric acid cycle. NADPH is an electron carrier that can donate electrons to other compounds and thus reduce them.

What is the purpose of photosystem I and II?

Energetic Electrons

Photosystem II is the first link in the chain of photosynthesis. It captures photons and uses the energy to extract electrons from water molecules. … Second, the electrons are passed down a chain of electron-carrying proteins, getting an additional boost along the way from photosystem I.

What is are the overall function S of photosystem I with electron transport chain 1 )?

What is/are the overall function(s) of photosystem I? ATP. … Under these circumstances, the system would switch to cyclic photophosphorylation and gain ATP, which can be used both in photosynthesis and in other types of metabolism. There is plenty of light, and the cell contains a high concentration of NADP+.

Who discovered ps1 and ps2?

Robert Emerson discovered pigment system-I (PS-I) and pigment system-II (PS-II).

What is the role of photosystems in photosynthesis?

Photosystems are the functional units for photosynthesis, defined by a particular pigment organization and association patterns, whose work is the absorption and transfer of light energy, which implies transfer of electrons. Physically, photosystems are found in the thylakoid membranes.

What is happening with energy in PS1?

What happens in PS1? a photon of light hits system. energy is transferred from pigment to pigment, until it gets to chlorophyll A.

Why do plants need two photosystems?

The new analysis explains convincingly why plants need two different photosystems in tandem: (i) PSII mostly extracts hydrogen from H2O, producing PQH2 (plastoquinol), and generates the energetically expensive product O2; this step provides little energy directly to the plant; (ii) PSI produces chemical energy for the …

What are the products of photosystem I?

ATP,O2 and NADPH are the products.

Where does PS1 and PS2 take place?

PS I is located at the outer surface of the grana thylakoid membrane (non appressed granal regions and stroma lamella). PS II is located at the inner surface of the grana thylakoid membrane (appressed granal region).

Why is photosynthesis important for plants?

Plants use photosynthesis to produce carbohydrates from inorganic substrates. All organisms need energy to grow and reproduce. … Whereas humans eat food to provide the fuel for respiration, plants make their own through photosynthesis. Without photosynthesis, plants would not have carbohydrates for respiration.

What is the concept of two photosystem?

A photosystem is an array of light-harvesting pigments containing a reaction center that carries out the necessary photochemistry. … The reaction centers of the photosynthetic photosystems are pigments termed P-680 and P-700 .

What is the difference between the roles of photosystem 1 and 2 in photosynthesis?

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).

What plays important role in photosynthesis?

A chloroplast is an organelle unique to plant cells that contains chlorophyll (makes plants green) and is responsible for enabling photosynthesis.

What is the most important part of photosynthesis in a plant?

When it comes to photosynthesis, the most important parts of the plant are the leaves. Their cells and structures are specialized to take in light and allow for gas exchange with the air around them. They also contain vascular structures that transport water from the roots into the cells that carry out photosynthesis.

What are three main differences between photosystem 1 and photosystem 2?

What is the difference between photosystem I and photosystem II quizlet?

What is the difference between Photosystem II and Photosystem I? Photosystems II and I have different chlorophylls. PS II has P680 and PS I has P700. Photosystem II comes before Photosystem I.