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im doing a report on photosynthesis and dont really understand what the photosytems really mean, please explain each the difference between them. Thanks in advance!!

2006-11-19 14:23:43 · 4 answers · asked by nick n 1 in Science & Mathematics Botany

4 answers

From Maricopa:

Photosystems are arrangements of chlorophyll and other pigments packed into thylakoids. Many Prokaryotes have only one photosystem, Photosystem II (so numbered because, while it was most likely the first to evolve, it was the second one discovered). Eukaryotes have Photosystem II plus Photosystem I. Photosystem I uses chlorophyll a, in the form referred to as P700. Photosystem II uses a form of chlorophyll a known as P680.

The process of photosynthesis is so complicated, you better take a look at the url. Simplified, it seems that P I produces NADPH, an energy carrier needed in the Light Independent Reaction. While P II produces Oxygen and an electron used in P II.

;-D I never did well in Chemistry! :-/

2006-11-19 14:59:43 · answer #1 · answered by China Jon 6 · 1 4

Photosystem 1

2016-09-28 09:44:47 · answer #2 · answered by clawson 4 · 0 0

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I found this in some old Biology notes I had. If this doesn't help, hope that this will be a start: Photosystem 1 was discovered first and is more ancient. It is the reaction center for chlorophyll a and best absorbs light with a 700nm wavelength. Photosystem 2 functions first in the linear electron flow; reaction center chlorophyll a and best absorbs light with 680nm wavelength.

2016-03-27 01:22:35 · answer #3 · answered by ? 4 · 0 0

Inside each chloroplast are thylakoid membranes, organised into granums, where the light reactions occur. Chlorophyll, the green pigment inside these membranes, captures the light energy and splits water in the photosystem II into protons, electrons and oxygen. The electrons flow then through the photosynthetic electron transport chain to photosystem I to replace the electrons there that were excited by the light energy and reduced NADP to NADPH. This is the light-dependent reaction. The products from this, NADPH, ATP and CO2, are used in the light-independent reaction, also known as the Calvin Cycle, to create glucose.

2006-11-19 17:01:17 · answer #4 · answered by cute_n_cuddly_teddy 1 · 10 0

Photosystem I clusters boost electrons to a higher energy state by absorbing light with a wavelength of 700nm.
Photosystem II clusters do the same thing except with light that has a wavelength of 680 nm(nanometers)

2006-11-19 14:34:50 · answer #5 · answered by aaylasecura 2 · 5 0

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