Meaning & use
granum
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A stack of disc-shaped membranes called thylakoids found within the chloroplasts of plant cells, where light reactions of photosynthesis occur.
See it in a sentence
Under the electron microscope, each granum appeared as a neat stack of green discs.
Light energy captured at the granum drives the first stage of photosynthesis.
A note on using this word
The plural form is "grana," from the Latin word for "grain," describing the granular appearance chloroplasts have under a microscope.
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