Biology, 16.10.2019 05:10 dhruvi62

The light reactions of photosynthesis generate high-energy electrons, which end up in the light reactions also produce and
a. chlorophyll : atp : nadph
b. oxygen : sugar : atp
c. atp : nadph : oxygen
d. nadph : atp : oxygen

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Answer from: cicilee49

d. NADPH : ATP : oxygen

Explanation:

Light acts on the P700 molecule of Photosystem I, causing an electron to be elevated to a higher potential. This electron is accepted by a primary acceptor (different from the one associated with Photosystem II).

The electron again goes through a series of redox reactions, and is eventually combined with NADP+ and H+ to form NADPH, an H-carrier needed in the light-independent phase.

Photosystem electron II replaces the excited electron of the molecule P700. There is therefore a continuous flow of electrons (non-cyclic) from water to NADPH, which is used for carbon fixation.

The cyclic flow of electrons occurs in some eukaryotes and photosynthetic bacteria. NADPH, only ATP, is not produced. This also occurs when the cell requires additional ATP, or when there is no NADP+ to reduce it to NADPH.

In Photosystem II, the H-ion "pumping" inwards of the thylacoids (from the chroma of the chlorotoplast) and the conversion of ADP+P into ATP is motorized by an electron gradient established in the thylacoid membrane.

The energy of light causes the removal of an electron from a P680 molecule that is part of Photosystem II, the electron is transferred to an accepting molecule (primary acceptor), and then passes downhill to Photosystem I through a conveyor chain of Electrons. The P680 requires an electron that is taken from the water by breaking it into H+ ions and O-2 ions. These O-2 ions combine to form oxygen (O2) that is released into the atmosphere.

Answer from: Quest

eukarya because is is like alche and b is bacteria and d is animals

explanation:

Answer from: Quest

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

Why are volcanos activity a good example of system interactions?

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