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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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