What has to happen to replace the electrons released by chlorophyll?

Chlorophyll is therefore said to “donate” an electron (Figure 5.12). To replace the electron in the chlorophyll, a molecule of water is split. This splitting releases an electron and results in the formation of oxygen (O₂) and hydrogen ions (H⁺) in the thylakoid space.

1. What replaces chlorophyll electrons in photosystem?
2. Where do the electrons that replace the excited electrons leaving the chlorophyll come from?
3. How do photosystems replace electrons?
4. What happens to the electrons that are lost by photosystem I?
5. When the chlorophyll at the reaction center of Photosystem II loses its electrons these are replaced by electrons from?
6. What happens when light excites the electrons in chlorophyll?
7. What happens when light hits chlorophyll?
8. When sunlight hits chlorophyll it gets excited and?
9. Does photosynthesis release energy?
10. Which molecule loses electrons during photosynthesis?
11. How are electrons lost by chlorophyll replaced in PSII?
12. Which process replaces the electrons released from photosystem II when light is initially absorbed?
13. What happens to the water in photosystem II?
14. What strikes Photosystem I causing the electrons to get excited again?
15. When the chlorophyll in the reaction center of photosystem 1 loses its electrons these are replaced by electrons from?
16. What happens at the reaction center of a photosystem quizlet?
17. What happens to electrons when pigments in photosystem II absorb light quizlet?

What replaces chlorophyll electrons in photosystem?

Photosynthetic eukaryotes and cyanobacteria have two photosystems – Photosystem II and Photosystem I. Light energy causes the excitation and loss of an electron from a PSII reaction center chlorophyll (P680). Water is oxidized to replace the lost electron, generating H⁺ ions and oxygen (O^-2) ions.

Where do the electrons that replace the excited electrons leaving the chlorophyll come from?

The light excites an electron from the chlorophyll a pair, which passes to the primary electron acceptor. The excited electron must then be replaced. In (a) photosystem II, the electron comes from the splitting of water, which releases oxygen as a waste product.

How do photosystems replace electrons?

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 (O₂), which is released into the atmosphere. The hydrogen ions are released into the lumen.

What happens to the electrons that are lost by photosystem I?

What happens to the electrons that are lost by photosystem 1? The electrons go to reduce the NADP to NADPH. ... Oxidation is the process of losing an electron. Since electrons are the main source for energy, the reaction also loses energy.

When the chlorophyll at the reaction center of Photosystem II loses its electrons these are replaced by electrons from?

The reaction center chlorophyll releases two energized electrons, which are replaced by the electrons from photosystem II. How are the electrons from photosystem II replaced? The boosted electrons lost from the reaction center in photosystem II are replaced by electrons stripped from a water molecule.

What happens when light excites the electrons in chlorophyll?

When light strikes chlorophyll (or an accessory pigment) within the chloroplast, it energizes electrons within that molecule. These electrons jump up to higher energy levels; they have absorbed or captured, and now carry, that energy.

What happens when light hits chlorophyll?

A photon of light hits chlorophyll, causing an electron to be energized. The free electron travels through the electron transport chain, and the energy of the electron is used to pump hydrogen ions into the thylakoid space, transferring the energy into the electrochemical gradient.

When sunlight hits chlorophyll it gets excited and?

A photon of light energy travels until it reaches a molecule of chlorophyll. The photon causes an electron in the chlorophyll to become “excited.” The energy given to the electron allows it to break free from an atom of the chlorophyll molecule. Chlorophyll is therefore said to “donate” an electron (Figure 5.12).

Does photosynthesis release energy?

In photosynthesis, solar energy is harvested as chemical energy in a process that converts water and carbon dioxide to glucose. Oxygen is released as a byproduct. In cellular respiration, oxygen is used to break down glucose, releasing chemical energy and heat in the process.

Which molecule loses electrons during photosynthesis?

Water is oxidized in photosynthesis, which means it loses electrons, and carbon dioxide is reduced, meaning it gains electrons.

How are electrons lost by chlorophyll replaced in PSII?

Electrons lost by Photosystem II are replaced directly by those from water. Electrons lost from P680 (pair of chlorophyll molecules) will be replaced by the splitting of a water molecules, which will generate oxygen as a byproduct. The correct answer is c) Water.

Which process replaces the electrons released from photosystem II when light is initially absorbed?

When light energy is absorbed by pigments and passed inward to the reaction center, the electron in P700 is boosted to a very high energy level and transferred to an acceptor molecule. The special pair's missing electron is replaced by an electron from PSII (arriving via the electron transport chain).

What happens to the water in photosystem II?

Photosystem II is the first link in the chain of photosynthesis. It captures photons and uses the energy to extract electrons from water molecules. ... First, when the electrons are removed, the water molecule is broken into oxygen gas, which bubbles away, and hydrogen ions, which are used to power ATP synthesis.

What strikes Photosystem I causing the electrons to get excited again?

Light strikes Photosystem I causing the electrons to get excited again. These excited electrons then continue down a second electron transport chain.

When the chlorophyll in the reaction center of photosystem 1 loses its electrons these are replaced by electrons from?

Light strikes antenna pigments in photosystem I, these pigments transfer the energy to the reaction center chlorophyll molecule of photosystem I. The reaction center chlorophyll releases 2 energized electrons, which are replaced by the electrons from photosystem II.

What happens at the reaction center of a photosystem quizlet?

When energy reaches the reaction center of the photosystem, the reaction center chlorophyll is oxidized when a high-energy electron is donated to the electron acceptor pheophytin, a pigment molecule structurally similar to chlorophyll.

What happens to electrons when pigments in photosystem II absorb light quizlet?

A pigment molecule absorbs a photon of light, passing its energy to other pigment molecules until it reaches Photosystem II. In Photosystem II, it excites an electron of chlorophyll P680 to a higher energy level. ... The electron is captured by the primary electron acceptor.