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plastoquinone

American

[plas-toh-kwuh-nohn, -kwin-ohn] / ˌplæs toʊ kwəˈnoʊn, -ˈkwɪn oʊn /

noun

Biochemistry.

a quinone that occurs in the chloroplasts of plants and functions as an electron carrier during photosynthesis.

Etymology

Origin of plastoquinone

1955–60; (chloro)plast or plast(id) + -o- + quinone

Example Sentences

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plastoquinone

Specifically, the transfer of electrons from pheophytin to plastoquinone in D2 requires twice as much activation energy as D1 -- a barrier that electrons seem unable to overcome, preventing energy from flowing forward.

From Science Daily ● Oct. 13, 2025

In theory, electrons should move from chlorophyll to pheophytin and then to plastoquinone along both branches.

From Science Daily ● Oct. 13, 2025

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