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Thylakoids

Biology ThylakoidThymine

thylakoids The specialized membrane structures in which photosynthesis takes place. Internal membranes in the chloroplast where the light reaction chemicals are embedded. Collections of thylakoids form the grana. PICTURE ...

 


Thylakoids (green) inside a cyanobacterium (Synechocystis)
A Thylakoid is a membrane-bound compartment inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis.

Thylakoids are membranous disk-like structures that are stacked together in larger structures that resemble stacks of coins. Chlorophyll and carotenoid pigments are located in the membranes of the thylakoids.

Thylakoids are stacked like pancakes in stacks known collectively as grana. The areas between grana are referred to as stroma. While the mitochondrion has two membrane systems, the chloroplast has three, forming three compartments.

thylakoids - flattened sac of membrane in a chloroplast that contains pigment and carries out the light-gathering reactions of photosynthesis ...

Thylakoids
The thylakoid membranes enclose a lumen: a system of vesicles (that may all be interconnected).
At various places within the chloroplast these are stacked in arrays called grana (resembling a stack of coins).

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.

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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See more about: Granum ...

Granum a stack of thylakoids within a chloroplast
(granum = grain)
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This energy is used to convert water plus atmospheric carbon dioxide into metabolizable sugars by the biochemical process of photosynthesis. Chloroplasts have a double outer membrane. Within the stroma are other membrane structures - the thylakoids.

thylakoid membrane A saclike photosynthetic membrane in chloroplasts; stacks of thylakoids form the grana.
thylakoid The lamellar structure of the grana of chloroplasts.
thymine A pyrimidine base occurring in DNA but not in RNA.

The thylakoids have chlorophyll molecules on their surface. That chlorophyll uses sunlight to create sugars. The stacks of sacs are connected by stromal lamellae.

See also: Thylakoid, Chloroplast, Trans, Membrane, Organ

Biology ThylakoidThymine

 
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