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When donating it's activated electron, the chlorophyll in photosystem II (P680) instead to be a very powerful oxidizing agent. This is best shown by its ability to:

1. make use of a proton electrochemical gradient to drive the formation of ATP.

2. force the oxidation of oxygen in water 2 oxygen gas

3. donate an electron to polastoquinone (Pq)

4. Absorb light energy to power redox reactions

5. Force the reduction of an NADP+ to NADPH

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Collen Von
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1 Apr 2019

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Related questions

The electron transport chain of the light reactions is responsible for energy coupling. Which statement correctly describes the energy coupling that occurs here?

_____________________

__ The electrons will decrease in potential energy as they are passed along, and this will be used to power the active transport of hydrogen ions.
__ The reduction of oxygen at the bottom of the electron transport chain will release energy, and this will be used to synthesize ATP.
__ The conversion of NADP+ into NADPH will release energy, and this will be used to reduce carbon dioxide into glyceraldehyde-3-phosphate.
__ The facilitated diffusion of water across the thylakoid membrane will release energy, and this will be used to generate an electrochemical gradient of electrons.

Phototrophs need an electron source like H2S orH2O. Where do the electrons from these sources go?(Assume the organism is growing autotrophically as well astophototrophically.)

O2 and CO2

O2 only

CO2 only
Sulfate or oxygen
Inorganic various molecules, depending on cellular needs.
2. Which of the following statements about chlorophyll istrue?
It is a good electron acceptor in its oxidized form.
It is a good electron donor in its reduced form when energizedby light.
It contains magnesium.
It is a tetrapyrrole.
All of the above
3. The unifying feature of all photosynthetic organisms isa(n)
electron transfer chain.
electron donating system to generate NADPH.
ATP-generating system.
light-gathering system.
All of the above
4. Evidence suggests that banded iron formations are due to
chemical oxidation of reduced iron, Fe2+.
aerobic reduction of insoluble ferric iron, Fe(OH)3.
anaerobic oxidation of soluble ferrous iron,Fe2+.
Both a and b
Both a and c
5. In addition to their ability to harvest light in the 400 to 500nm range, carotenoids also
eject electrons from the reaction center.
function as a tetrapyrrole.
intercept toxic single-state oxygen.
transfer electrons to ubiquinone.
raise electrons to a higher energy state.
6. Ribosomal RNA and other cell features affirm that living cellsshould be divided into three groups called domains.
True
False
7. Microbes have started to evolve recently.
True
False
8. The ________ was essential for the evolution of oxygenicphotosynthesis.
evolution of cyanobacteria
development of photosystem I
ability to extract electrons from CO2
ability to extract electrons from H2O
ability to use oxygen as the terminal electron acceptor
9. What do oxygenic phototrophs use as an electron source?
Oxygen
Sulfide
Water
Organic compounds
CO2
10. Three domains of organisms have been established basedprimarily on size and other structural features of the cells.
True
False

Q1:

Enzymes are essential for the conversion of organic molecules in biochemical pathways. Which of the following statements is incorrect?

Enzymes reduce the activation energy of chemical reactions.

Enzymes are catalysts and appear unchanged at the end of the reaction.

Enzymes change the equilibrium of a reaction.

Enzymes form a complex with the substrate.

Enzymes facilitate both the conversion of substrates into products and of products into substrates.

Q2:

NADH and NADPH are important energy carriers in biochemical pathways. Which of the following statements about these compounds is incorrect?

NADP+ is reduced by two electrons (involving 2 protons) from photosystem I to form NADPH + H+.

NADH is produced both during glycolysis and in the TCA cycle.

NADH feeds electrons into the respiratory chain of mitcohondria, which are ultimately used to form water.

In the absence of oxygen NADH produced during glycolysis is reoxidised by formation of lactate from pyruvate or by formation of ethanol from acetaldehyde (fermentation).

The majority of NADH produced during oxidation of glucose (in the presence of oxygen) is generated during glycolysis.

Q3:

The respiratory chain converts the reducing power of NADH into the production of ATP. Which of the following statements is incorrect?

Electrons are passed through the respiratory chain in a way to optimise the production of heat.

The complexes of the respiratory chain use the energy of redox reactions to pump protons across the inner mitochondrial membrane.

The ATP synthase uses the protonmotive force to synthesize ATP.

The principle of energy conversion by respiratory chain and ATP synthase is called “chemiosmosis”.

The electrons from NADH are passed along the respiratory chain in a number of redox reactions mostly involving complexes

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