Granum

Granum
A granum (plural grana) is a stack of thylakoids in the chloroplast, an organelle found in plants and eukaryotic algae where photosynthesis takes place. Chloroplasts can have from 10 to 100 grana.
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granum pl. grana
(gran-um) [L. grain or seed]
A stacked portion of the thylakoid membrane in the chloroplast. Grana function in the light reactions of photosynthesis.
gravitropism ...

Granum a stack of thylakoids within a chloroplast
(granum = grain)
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Hamstrings muscles that are the back of the thigh
(named after the muscles and tendons in the same location on a pig) ...

Granum A pile or stack of thylakoid membranes in the chloroplast.
Granzymes Proteolytic enzymes secreted by activated T cells into target cells to initiate apoptosis.

[edit] Granum
A granum (plural grana) is a stack of thylakoid discs. Chloroplasts can have from 10 to 100 grana. Grana are connected by stroma thylakoids, also called intergrana thylakoids or lamellae.

granum Structures within chloroplasts, seen as green granules with the light microscope and as a series of stacked disk-shaped membranes with an electron microscope; ...

One thylakoid stack is called a granum. The thylakoids have chlorophyll molecules on their surface. That chlorophyll uses sunlight to create sugars. The stacks of sacs are connected by stromal lamellae.

contain chlorophyll, the green pigment necessary for photosynthesis to occur, and associated accessory pigments (carotenes and xanthophylls) in photosystems embedded in membranous sacs, thylakoids (collectively a stack of thylakoids are a granum [ ...

In higher plants, lamellae, internal membranes with stacks (each termed a granum) of closed hollow disks called thylakoids, are also usually dispersed throughout the stroma.

into metabolizable sugars by the biochemical process of photosynthesis. Chloroplasts have a double outer membrane. Within the stroma are other membrane structures - the thylakoids. Thylakoids appear in stacks called "grana" (singular = granum).

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Topic: Biology