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photosystem

British

/ ˈfəʊtəʊˌsɪstəm /

noun

botany either of two pigment-containing systems, photosystem I or II, in which the light-dependent chemical reactions of photosynthesis occur in the chloroplasts of plants

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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An early stage that involved cyanobacteria innovating a new pigment, chlorophyll f, enabling the photosystem to harvest far-red light for the first time.

From Science Daily • Nov. 28, 2023

The late stage, occurring approximately 2 billion years ago, further optimized the capacity to harvest far-red light by evolving a second modified photosystem incorporating chlorophyll f at critical locations.

From Science Daily • Nov. 28, 2023

A photon strikes photosystem II to initiate photosynthesis.

From Textbooks • Apr. 25, 2013

A pigment molecule in the photosystem absorbs one photon, a quantity or “packet” of light energy, at a time.

From Textbooks • Apr. 25, 2013

A synthetic genome in yeast allows complex and rapid sequence manipulation to create synthetic chloroplast genomes; in fact, several photosystem proteins from Scenedesmus obliquus were found to function in .

From Nature • Aug. 15, 2012

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023