The energy absorbed in PSII is
enough to oxidize (split) water
, releasing oxygen into the atmosphere; the electrons released from the oxidation of water replace the electrons that were boosted from the reaction center chlorophyll.
What is happening with energy in cytochrome complex?
During photosynthesis, the cytochrome b
6
f complex is one step along the chain that
transfers electrons from Photosystem II to Photosystem I
, and at the same time pumps protons into the thylakoid space that contribute to create an electrochemical (energy) gradient which is later used to synthesize ATP from ADP.
What is happening with matter in photosystem 1?
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 happens in photosystem I and photosystem II?
The primary function of the photosystem I is
in NADPH synthesis
, where it receives the electrons from PS II. The primary function of the photosystem II is in the hydrolysis of water and ATP synthesis. The PSI is made up of two subunits which are psaA and psaB.
What is the purpose of photosystem 2?
Photosystem II (PSII) is a multi-component pigment-protein complex that is responsible for
water splitting, oxygen evolution, and plastoquinone reduction
.
Does photosystem 2 produce oxygen?
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
(O
2
), which is released into the atmosphere.
What happens if photosystem 1 is blocked?
A herbicide that disrupts photosystem 1
disturbs the electron transport in the light reaction of photosynthesis
. It leads to the deficiency of NADPH because photosystem 1 is the electron donor for the NADPH production. The secondary effect of a herbicide that targets photosystem 1 is it disrupts the membrane.
How does cyanide block complex 4?
Cyanide
poisons the mitochondrial electron transport chain within cells
and renders the body unable to derive energy (adenosine triphosphate—ATP) from oxygen. Specifically, it binds to the a3 portion (complex IV) of cytochrome oxidase and prevents cells from using oxygen, causing rapid death.
What happens when cyanide inhibits Complex 4?
The blocklock of complex IV by cyanide
depletes ATP culminating in cell death
. … Thus, cellular respiration is inhibited, as well as ATP production, in essence depriving the cells, tissue, and, ultimately, the whole body of oxygen.
What happens if cytochrome c is inhibited?
Cyanide, azide, and carbon monoxide all bind to cytochrome c oxidase,
inhibiting the protein from functioning and leading to the chemical asphyxiation of cells
. … NO and CN
−
will compete with oxygen to bind at the site, reducing the rate of cellular respiration.
What is the difference between photosystem I and II?
Photosystem I is very receptive to light waves
at the 700 nm wavelength. In comparison, photosystem II is very receptive to light wavelengths of around 680 nm. Both photosystem I and II are necessary in most plants to produce the energy they need from the sun.
How are photosystem I and II similar and different?
How photosystem I and photosystem II similar? … In photosystem II,
energy is absorbed by electrons, creating high-energy electrons
which are passed on to the electron transport chain but in photosystem I the electrons are picked up by NADP to form NADPH.
What is the end product of photosystem I?
ATP
is the product of photosystem I.
What will happen inside of photosystem II when light enters?
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. … Of course, this leaves the original chlorophyll without an electron.
What happens when photosystem II is inhibited?
By
inhibiting the binding of PQ, the process of photosynthetic electron transfer is interrupted, and the synthesis of ATP and NADPH in the chloroplast is compromised
. This results in an inability to fix CO
2
and produce the nutrients needed for the plant to survive.
What happens when photosystem II absorbs light?
When light is absorbed by one of the pigments in photosystem II,
energy is passed inward from pigment to pigment until it reaches the reaction center
. There, energy is transferred to P680, boosting an electron to a high energy level (forming P680*).
